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Loans and Allowance for Credit Losses on Loans - Amortized cost basis of collateral-dependent loans by loan portfolio segment (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	$ 5,682
Construction & Secured by Farmland
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	96
HELOCs
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans
Residential First Lien - Investor
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	1,093
Residential First Lien - Owner Occupied
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	79
Residential Junior Liens
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans
Commercial - Owner Occupied
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	16
Commercial - Non-Owner Occupied & Multifamily
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	3,656
SBA PPP loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans
Other commercial and industrial loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	312
Marine loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	0
Real Estate Collateral [Member]
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	4,940
Real Estate Collateral [Member] | Construction & Secured by Farmland
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	96
Real Estate Collateral [Member] | HELOCs
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans
Real Estate Collateral [Member] | Residential First Lien - Investor
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	1,093
Real Estate Collateral [Member] | Residential First Lien - Owner Occupied
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	79
Real Estate Collateral [Member] | Residential Junior Liens
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans
Real Estate Collateral [Member] | Commercial - Owner Occupied
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	16
Real Estate Collateral [Member] | Commercial - Non-Owner Occupied & Multifamily
Financing Receivable, Past Due [Line Items]
Mortgage real estate loans	3,656
Other Collateral [Member]
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	742
Other Collateral [Member] | Other commercial and industrial loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	312
Other Collateral [Member] | Marine loans
Financing Receivable, Past Due [Line Items]
Commercial and industrial loans	$ 430

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+ References

No definition available.

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+ 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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