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Loans - Classes of Loans (Details) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Exclude accrued interest receivable from the amortized cost basis of loans $ 6,300,000      
Subtotal 1,673,195,000 $ 1,635,718,000    
Less allowance for credit losses (40,834,000) (40,518,000) $ (39,768,000) $ (40,157,000)
Loans, net 1,632,361,000 1,595,200,000    
Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subtotal 614,620,000 592,301,000    
Commercial business        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subtotal 114,722,000 118,605,000    
Construction - commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subtotal 53,801,000 49,136,000    
Land acquisition and development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subtotal 40,214,000 37,537,000    
Builder lines        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subtotal 32,668,000 34,538,000    
Construction - consumer real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subtotal 12,552,000 10,539,000    
Residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subtotal 278,106,000 266,267,000    
Less allowance for credit losses   (2,622,000) (2,628,000) (2,660,000)
Equity lines        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subtotal 43,443,000 43,300,000    
Less allowance for credit losses   (497,000) (544,000) (593,000)
Other consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subtotal 7,911,000 8,938,000    
Amount included related to demand deposit overdrafts 205,000 284,000    
Consumer finance        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subtotal 475,158,000      
Less allowance for credit losses (25,875,000) (25,969,000) $ (25,099,000) $ (24,791,000)
Consumer finance | Automobiles        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subtotal 409,350,000 411,112,000    
Consumer finance | Marine and recreational vehicles        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subtotal $ 65,808,000 $ 63,445,000