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Loans - Loan Portfolio by Class (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	$ 1,817,427,000	$ 1,742,139,000
90+ Days Past Due and Accruing	278,000	128,000
Loans on nonaccrual status	1,291,000	1,298,000
Nonaccrual loans, 90+ days past due	1,160,000
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	12,491,000	17,498,000
Loans on nonaccrual status	286,000
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	1,330,000	3,233,000
Loans on nonaccrual status	22,000
90+ Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	1,127,000	1,290,000
Nonaccrual loans, 90+ days past due	850,000
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	14,948,000	22,021,000
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	1,802,479,000	1,720,118,000
Loans on nonaccrual status	113,000
Current, nonaccrual status	155,000
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	693,603,000	668,122,000
Commercial real estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross		92,000
Commercial real estate | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross		92,000
Commercial real estate | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	693,603,000	668,030,000
Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	116,236,000	115,348,000
90+ Days Past Due and Accruing		1,000
Commercial business | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	9,000
Commercial business | 90+ Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross		1,000
Commercial business | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	9,000	1,000
Commercial business | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	116,227,000	115,347,000
Construction - commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	96,916,000	69,768,000
Construction - commercial real estate | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	96,916,000	69,768,000
Land acquisition and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	29,644,000	29,064,000
Land acquisition and development | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	29,644,000	29,064,000
Builder lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	28,363,000	24,668,000
Builder lines | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	28,363,000	24,668,000
Construction - consumer real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	12,471,000	11,223,000
Construction - consumer real estate | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	12,471,000	11,223,000
Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	300,178,000	293,256,000
90+ Days Past Due and Accruing	216,000	89,000
Loans on nonaccrual status	441,000	320,000
Residential mortgage | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	780,000	1,643,000
Residential mortgage | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross		387,000
Residential mortgage | 90+ Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	216,000	273,000
Residential mortgage | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	996,000	2,303,000
Residential mortgage | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	299,182,000	290,953,000
Equity lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	54,463,000	51,592,000
90+ Days Past Due and Accruing	62,000	38,000
Loans on nonaccrual status	99,000	77,000
Equity lines | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	457,000	215,000
Equity lines | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross		103,000
Equity lines | 90+ Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	161,000	115,000
Equity lines | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	618,000	433,000
Equity lines | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	53,845,000	51,159,000
Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	9,450,000	10,588,000
Loans on nonaccrual status	10,000	9,000
Other consumer | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	78,000	3,000
Other consumer | 90+ Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	9,000	9,000
Other consumer | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	87,000	12,000
Other consumer | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	9,363,000	10,576,000
Consumer finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	476,103,000	468,510,000
Consumer finance | Automobiles
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	407,280,000	401,276,000
Loans on nonaccrual status	705,000	892,000
Consumer finance | Automobiles | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	10,782,000	15,263,000
Consumer finance | Automobiles | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	1,330,000	2,628,000
Consumer finance | Automobiles | 90+ Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	705,000	892,000
Consumer finance | Automobiles | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	12,817,000	18,783,000
Consumer finance | Automobiles | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	394,463,000	382,493,000
Consumer finance | Marine and recreational vehicles
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	68,823,000	67,234,000
Loans on nonaccrual status	36,000
Consumer finance | Marine and recreational vehicles | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	385,000	282,000
Consumer finance | Marine and recreational vehicles | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross		115,000
Consumer finance | Marine and recreational vehicles | 90+ Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	36,000
Consumer finance | Marine and recreational vehicles | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	421,000	397,000
Consumer finance | Marine and recreational vehicles | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	$ 68,402,000	$ 66,837,000

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