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Loans - Loan Portfolio by Class (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	$ 1,717,729,000	$ 1,635,718,000
90+ Days Past Due and Accruing	440,000
Loans on nonaccrual status	1,376,000	1,189,000
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	14,383,000
Loans on nonaccrual status	9,000
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	2,231,000
90+ Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	1,666,000
Loans on nonaccrual status	1,230,000
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	18,280,000
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	1,699,449,000
Loans on nonaccrual status	141,000
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	645,467,000	592,301,000
90+ Days Past Due and Accruing	160,000
Loans on nonaccrual status	264,000
Commercial real estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	614,000
Commercial real estate | 90+ Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	424,000
Commercial real estate | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	1,038,000
Commercial real estate | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	644,429,000
Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	118,641,000	118,605,000
Commercial business | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	52,000
Commercial business | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	30,000
Commercial business | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	82,000
Commercial business | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	118,559,000
Construction - commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	62,994,000	49,136,000
Construction - commercial real estate | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	62,994,000
Land acquisition and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	28,400,000	37,537,000
Land acquisition and development | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	28,400,000
Builder lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	30,787,000	34,538,000
Builder lines | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	30,787,000
Construction - consumer real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	12,046,000	10,539,000
Construction - consumer real estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	282,000
Construction - consumer real estate | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	282,000
Construction - consumer real estate | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	11,764,000
Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	290,325,000	266,267,000
90+ Days Past Due and Accruing	280,000
Loans on nonaccrual status	141,000	156,000
Residential mortgage | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	633,000
Residential mortgage | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	71,000
Residential mortgage | 90+ Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	280,000
Residential mortgage | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	984,000
Residential mortgage | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	289,341,000
Equity lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	48,027,000	43,300,000
Loans on nonaccrual status	60,000	108,000
Equity lines | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	268,000
Equity lines | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	9,000
Equity lines | 90+ Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	51,000
Equity lines | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	328,000
Equity lines | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	47,699,000
Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	9,867,000	8,938,000
Other consumer | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	9,867,000
Consumer finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	471,175,000
Consumer finance | Automobiles
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	403,154,000	411,112,000
Loans on nonaccrual status	831,000	842,000
Consumer finance | Automobiles | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	12,233,000
Consumer finance | Automobiles | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	2,121,000
Consumer finance | Automobiles | 90+ Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	831,000
Consumer finance | Automobiles | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	15,185,000
Consumer finance | Automobiles | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	387,969,000
Consumer finance | Marine and recreational vehicles
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	68,021,000	63,445,000
Loans on nonaccrual status	80,000	$ 83,000
Consumer finance | Marine and recreational vehicles | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	301,000
Consumer finance | Marine and recreational vehicles | 90+ Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	80,000
Consumer finance | Marine and recreational vehicles | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	381,000
Consumer finance | Marine and recreational vehicles | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, gross	$ 67,640,000

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