Meet Our Team

Gregg Mashack

Gregg Mashack joined Farmers & Merchants State Bank  in 2024, with 25 years of experience in the banking industry, having held key leadership roles in various financial institutions. His knowledge of banking operations, strategic planning, and customer-centric approach will further strengthen our commitment to delivering value and  legendary service to our customers.

Outside of work, Gregg Mashack is a family man who enjoys spending quality time with his wife and 14 year old son. An avid outdoorsman, he is passionate about hunting and fishing. Gregg also shares a love for sports, both as a spectator and coach, embodying the spirit of teamwork and camaraderie.

Tim Gerdes

Tim Gerdes is Farmers & Merchants State Bank's  Executive VP and Chief Financial Officer. With over 32 years of banking experience and expertise, Tim brings a wealth of knowledge to his role. He holds a BA in Business Administration with a major in Accounting, as well as an MBA with a major in Finance. Tim's passion for finance extends beyond the workplace. Whether he's traveling to his hometown in Vermont or enjoying a round of golf, he always keeps a close eye on his scorecard and receipts.

Outside of work, Tim's world revolves around spending quality time with his daughter, and he cherishes every moment.

David Stronach

David (Dave) Stronach has been a leader on the F & M team since 2002. As Senior VP of Commercial Lending, David oversees the bank’s lending staff. As a financial Partner For Life he has developed relationships with the business community by providing financing solutions to local business owners.
Dave is an avid sports fan and cheers for ALL the major teams from Wisconsin specifically the Green Bay Packers, Milwaukee Brewers and the UW Badgers (and he has the team-wear to proudly prove it!)

Joshua Patterson

Josh brings nearly 20 years of banking experience and a relationship-first mindset to his role at F&M. As Senior Vice President and Senior Lender, he’s passionate about helping local families and businesses thrive through smart, community-focused lending solutions. Josh is actively involved in the local community, serving on multiple boards and leading service initiatives. Outside the bank, he enjoys time with his wife and four kids, coaching youth sports, camping, golfing, and rooting for his favorite Wisconsin teams.

Malinda Weisensel

If you’re looking for a Jack of all trades for Farmers & Merchants State Bank, Malinda Weisensel has done it all since joining the team in 2007. Whether it’s been assisting with maintenance and technology support or keeping up-to-date with the ever changing technologies, Malinda does her best to make things clear and understandable for everyone. She takes pride in being a problem solver, and uses her diverse skill set to make sure she finds the solution that is right for each customer.

Malinda and her husband Brett have been married for 18 years and have two daughters, Halle and Kennedy, and one dog. In addition to participating in the bank’s community activities, Malinda also enjoys coaching her daughters’ sports teams. Even though she grew up in Deerfield, she’s happy to live in Marshall, where she loves cheering for the Packers, the Badgers and her daughters’ sports teams.

Robert Helvey

In early 2024, Farmers & Merchants State Bank proudly welcomed Robert Helvey as Vice-President of Mortgage Lending. With over 25 years in the mortgage and banking industry, Robert brings expertise in sales, operations, and underwriting. A lifelong Wisconsin resident, he’s a proven leader known for innovative solutions, customer education, and community involvement. Robert is the Past-President of the Wisconsin Mortgage Bankers Association, an Ironman triathlete, and a UW-Whitewater graduate. He’s excited to enhance F&M’s mortgage services and help customers achieve their homeownership goals.

Justine Hellenbrand

Justine has been with Farmers & Merchants State Bank since 2012. With over 34 years of banking experience, Justine has the knowledge and skill set to ensure the operations of the bank run as smoothly as possible.  She also helps keeps the F&M team healthy and fit by leading up the F&M Health Committee.  Ask Justine for her egg-bake recipe, you won't be disappointed!

While not at work, Justine enjoys spending time with family and friends at her lake cabin. 

Jena Bleeker

Jena Bleecker serves at F & M as their compliance officer which means that she gets to keep everyone in line! On a daily basis she keeps up with the ever-changing rules and regulations of the banking industry. She attends multiple seminars, forums and webinars to accomplish this. She also audits all the different departments of the bank to make sure that those regulations and our own internal procedures are followed. 
To Jena, being your “Partner for Life” means that from your first job to retirement, F & M has products and services that will help you through all of life’s stages. When combined with the personal customer service experience found a smaller institution, this makes our bank the only financial “partner” you will need.
In Jena’s free time you will find her relaxing by the lake with her husband and three kids at their cabin up north.

Heather Gretzinger

Heather Gretzinger provides support for all things human resource and operations at Farmers & Merchants State Bank.  Her extensive background in customer service and teammate development pairs well and brings a fresh approach to policies and procedures.

Heather enjoys spending her free time “Up North” where she hits the snowmobile trails and creates memories with her family.

Rachel Geise

Haily Wandel

Haily Wandel brings over 24 years of banking experience to Farmers & Merchants State Bank, having worked in various roles, including Teller, Personal Banker, Bank Operations, BSA & Security, and Branch Manager. Her deep knowledge of fraud prevention, customer service, and employee development makes her a strong leader in the banking industry. With a passion for building relationships, Haily is dedicated to helping customers achieve their financial goals while ensuring they feel supported and protected.

As AVP Branch Market Manager, Haily is excited to be part of a community-focused bank that values strong connections with local businesses and individuals. She looks forward to getting involved in the community through volunteer work and engaging with customers to provide exceptional service. Outside of banking, Haily enjoys spending time with family and friends, crafting, and relaxing up north at the family cabin with her two dogs.

Board of Directors

Row 1: William Hogan, Kathy Forest, Andrew Griggs, Adriane Stuebs, Terry Hellenbrand

Row 2: Gregg Mashack, Terry Weisensel, James Beyer, William Campbell

Nicki Kelly

Nicki Kelly brings experience and a genuine passion for building strong community connections to her role as Vice President - Director of Marketing at Farmers & Merchants State Bank. With a professional background spanning customer service, mortgage lending, and branch management, Nicki has spent her career helping customers achieve their financial goals and creating meaningful relationships.

In 2025, Nicki transitioned into her current role, where she focuses on promoting F&M’s commitment to the communities it serves. Her deep-rooted love for supporting local organizations shines through in her work, whether collaborating on events, developing creative marketing strategies, or fostering partnerships that make a lasting impact.

Born and raised in Lake Mills, Nicki is proud to call the area home. She lives in Lake Mills with her family, who are the heart of her world. When she's not at work, you’ll find her cheering on her son, volunteering, or enjoying all that the Lake Mills community has to offer.

Autumn Rennhack

Autumn Rennhack has been a Universal Bankers for the bank since 2017 and assumed a lead role in December of 2019. She is fluent in retail products and is our expert in ID Theftsmart and ClickSwitch. During her time here she has helped in several events in the community school such as Marshall STEAM nights and Waterloo learning events. As part of the Marketing team she represented F & M during the Rivalry on the River events and has volunteered at the Marshall~Waterloo Food Pantry & Weiner & Kraut Day. 
When Autumn is not at the bank she enjoys spending time with family, friends and her 2 dogs. She even bakes her own dog treats and brings them for our community dog lovers during the Relay for Life bake sales. 

Scott Cochems

Scott Cochems joined Farmers & Merchants State Bank in 2011 and has more than 20 years of commercial lending experience. As Senior Vice President of Commercial Lending, Scott is responsible for new business development and growing and maintaining the bank’s commercial loan portfolio while remaining a resource for local business owners.  Scott furthered his education by graduating from the Graduate School of Banking at UW Madison in 2015. Scott is also an active member of his community’s Rotary.
Scott was born and raised in the Madison area, which gives him a great understanding of that local market.  Scott enjoys the outdoors and cheering for the state’s sports teams.

Brad Chadwick

Brad Chadwick has been a valued member of Farmers & Merchants State Bank since 2007, bringing over 23 years of experience in the banking industry. With a strong focus on lending, Brad takes pride in helping individuals, families, and businesses navigate the loan process, ensuring they have the financial tools needed to achieve their goals. His expertise spans home purchases, refinancing, construction loans, and business lending, making him a trusted resource for his clients.

Beyond his dedication to banking, Brad has a deep commitment to giving back to the community. He is an active member of the Marshall Area Business Association (MABA), where he collaborates with local business leaders to foster economic growth and strengthen community ties.

Outside of work, Brad enjoys spending quality time with his wife, taking memorable trips to Hawaii, and making the most of life with his friends. At home, he shares his time with his beloved cats, who add plenty of personality to his days.

Sandra Carlson

Sandra joined Farmers & Merchants State Bank over two years ago as a Universal Banker I and quickly advanced to her current role as an Assistant Branch Manager & Universal Banker II. Her natural curiosity, passion for learning, and commitment to serving others helped her grow within the bank.

Sandra loves getting to know the customers who walk through the door—not just helping with their banking needs, but hearing about their lives, families, and even their pets. It’s these everyday conversations that make her role especially rewarding.

She enjoys participating in community events through the bank, which allows her to connect with and give back to the people she sees every day.

Outside of work, Sandra enjoys spending time with her husband and kids, hiking, reading, and tending to her plants. When the weather is nice, you’ll likely find her out on the water or soaking up the outdoors with friends and family.