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Allowance for Credit Losses on Loans - Amortized cost basis of collateral-dependent loans by loan portfolio segment (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	$ 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	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	14
Commercial - Non-Owner Occupied & Multifamily
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	3,625
Marine loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	552
Real Estate Collateral
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	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	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	14
Real Estate Collateral | Commercial - Non-Owner Occupied & Multifamily
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	3,625
Other Collateral
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	552
Other Collateral | Marine loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	$ 552

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 80
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-80

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