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Allowance for Credit Losses on Loans - Amortized cost basis of collateral-dependent loans by loan portfolio segment (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Financing Receivable, Allowance for Credit Loss, Individually Evaluated	$ 2,048	$ 5,574
Construction & Secured by Farmland
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans		95
Residential First Lein - Investor
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans		1,086
Residential First Lein - Owner Occupied
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	318	194
Residential Junior Liens
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans		8
Commercial - Owner Occupied
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	739	14
Commercial - Non-Owner Occupied & Multifamily
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans		3,625
Other commercial and industrial loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	908
Marine loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans		552
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	1,140	5,022
Real Estate Collateral | Construction & Secured by Farmland
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans		95
Real Estate Collateral | Residential First Lein - Investor
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans		1,086
Real Estate Collateral | Residential First Lein - Owner Occupied
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	318	194
Real Estate Collateral | Residential Junior Liens
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans		8
Real Estate Collateral | Commercial - Owner Occupied
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	739	14
Real Estate Collateral | Commercial - Non-Owner Occupied & Multifamily
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans		3,625
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	908	552
Other Collateral | Other commercial and industrial loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	$ 908
Other Collateral | Marine loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans		$ 552

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Amount of allowance for credit loss on financing receivable evaluated on individual basis. Excludes financing receivable evaluated on collective basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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