Allowance for Credit Losses on Loans - Amortized cost basis of collateral-dependent loans by loan portfolio segment (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Financing Receivable, Individually Evaluated for Credit Loss	$ 14,355	$ 2,048
Financing Receivable, Allowance for Credit Loss, Individually Evaluated	467	248
Construction & Secured by Farmland
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	428
HELOCs
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	160
Residential First Lein - Investor
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	98
Residential First Lein - Owner Occupied
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	470	318
Commercial - Owner Occupied
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	4,738	739
Commercial - Non-Owner Occupied & Multifamily
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	5,348
Other commercial and industrial loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	3,113	908
Marine loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	0
Consumer loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans		83
Real Estate Collateral
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	11,242	1,140
Real Estate Collateral | Construction & Secured by Farmland
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	428
Real Estate Collateral | HELOCs
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	160
Real Estate Collateral | Residential First Lein - Investor
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	98
Real Estate Collateral | Residential First Lein - Owner Occupied
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	470	318
Real Estate Collateral | Commercial - Owner Occupied
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	4,738	739
Real Estate Collateral | Commercial - Non-Owner Occupied & Multifamily
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	5,348
Real Estate Collateral | Consumer loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans		83
Other Collateral
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	3,113	908
Other Collateral | Other commercial and industrial loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	$ 3,113	$ 908