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Summary of Significant Accounting Policies - Impact of adoption (Details) - USD ($)
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Assets:            
Loans, gross $ 1,717,729,000   $ 1,635,718,000      
Allowance for credit losses 40,248,000   40,518,000 $ 40,880,000   $ 40,157,000
Loans, net 1,677,481,000   1,595,200,000      
Net deferred tax asset 23,434,000   22,014,000      
Liabilities:            
Total equity: 200,380,000 $ 202,528,000 196,233,000 185,440,000 $ 196,283,000 211,024,000
Commercial            
Assets:            
Allowance for credit losses 12,164,000   11,219,000      
Consumer            
Assets:            
Allowance for credit losses 3,695,000   3,330,000      
Consumer finance            
Assets:            
Loans, gross 471,175,000          
Allowance for credit losses $ 24,389,000   25,969,000 $ 26,262,000   $ 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