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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	Mar. 31, 2023 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	$ 1,733
Construction & Secured by Farmland [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	100
HELOCs [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	137
Residential First Lien - Investor [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	0
Residential First Lien - Owner Occupied [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	83
Residential Junior Liens [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	0
Commercial Real Estate Owner Occupied [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	19
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	1,321
SBA PPP Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Other commercial and industrial loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	73
Marine loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Consumer loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Overdrafts [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Other Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Real Estate Collateral [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	1,660
Real Estate Collateral [Member] | Construction & Secured by Farmland [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	100
Real Estate Collateral [Member] | HELOCs [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	137
Real Estate Collateral [Member] | Residential First Lien - Investor [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	0
Real Estate Collateral [Member] | Residential First Lien - Owner Occupied [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	83
Real Estate Collateral [Member] | Residential Junior Liens [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	0
Real Estate Collateral [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	19
Real Estate Collateral [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	1,321
Real Estate Collateral [Member] | SBA PPP Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Real Estate Collateral [Member] | Other commercial and industrial loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Real Estate Collateral [Member] | Marine loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Real Estate Collateral [Member] | Consumer loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Real Estate Collateral [Member] | Overdrafts [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Real Estate Collateral [Member] | Other Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Other Collateral [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	73
Other Collateral [Member] | Construction & Secured by Farmland [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	0
Other Collateral [Member] | HELOCs [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	0
Other Collateral [Member] | Residential First Lien - Investor [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	0
Other Collateral [Member] | Residential First Lien - Owner Occupied [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	0
Other Collateral [Member] | Residential Junior Liens [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	0
Other Collateral [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	0
Other Collateral [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Mortgage real estate loans	0
Other Collateral [Member] | SBA PPP Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Other Collateral [Member] | Other commercial and industrial loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	73
Other Collateral [Member] | Marine loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Other Collateral [Member] | Consumer loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Other Collateral [Member] | Overdrafts [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	0
Other Collateral [Member] | Other Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Commercial and industrial loans	$ 0

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