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Adoption of New Accounting Standards - Impact of adoption (Details) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Assets:        
Loans, gross $ 1,673,195,000 $ 1,635,718,000    
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    
Net deferred tax asset 21,018,000 22,014,000    
Liabilities:        
Total equity: 203,184,000 196,233,000 201,278,000 211,024,000
Commercial        
Assets:        
Allowance for credit losses 11,449,000 11,219,000    
Consumer        
Assets:        
Allowance for credit losses 3,510,000 3,330,000    
Consumer finance        
Assets:        
Loans, gross 475,158,000      
Allowance for credit losses $ 25,875,000 25,969,000 $ 25,099,000 $ 24,791,000
Impact of ASC 326        
Liabilities:        
Total equity:   (1,072,000)    
Impact of ASC 326 | Accounting Standards Update 2016-13        
Assets:        
Loans, gross   604,000    
Allowance for credit losses   491,000    
Loans, net   113,000    
Net deferred tax asset   316,000    
Liabilities:        
Reserve for credit losses on unfunded commitments   1,501,000    
Total equity:   (1,072,000)    
Impact of ASC 326 | Accounting Standards Update 2016-13 | Commercial        
Assets:        
Allowance for credit losses   (22,000)    
Impact of ASC 326 | Accounting Standards Update 2016-13 | Consumer        
Assets:        
Allowance for credit losses   107,000    
Impact of ASC 326 | Accounting Standards Update 2016-13 | Consumer finance        
Assets:        
Allowance for credit losses   406,000    
As Reported under ASC 326 | Accounting Standards Update 2016-13        
Assets:        
Loans, gross   1,636,322,000    
Allowance for credit losses   41,009,000    
Loans, net   1,595,313,000    
Net deferred tax asset   22,330,000    
Liabilities:        
Reserve for credit losses on unfunded commitments   1,501,000    
Total equity:   195,161,000    
As Reported under ASC 326 | Accounting Standards Update 2016-13 | Commercial        
Assets:        
Allowance for credit losses   11,197,000    
As Reported under ASC 326 | Accounting Standards Update 2016-13 | Consumer        
Assets:        
Allowance for credit losses   3,437,000    
As Reported under ASC 326 | Accounting Standards Update 2016-13 | Consumer finance        
Assets:        
Allowance for credit losses   $ 26,375,000