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Summary of Significant Accounting Policies - Impact of adoption (Details) - USD ($)
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Assets:            
Loans, gross $ 1,686,990,000   $ 1,635,718,000      
Allowance for credit losses 40,528,000   40,518,000 $ 40,519,000   $ 40,157,000
Loans, net 1,646,462,000   1,595,200,000      
Net deferred tax asset 21,932,000   22,014,000      
Liabilities:            
Total equity: 202,528,000 $ 203,184,000 196,233,000 196,283,000 $ 201,278,000 211,024,000
Commercial            
Assets:            
Allowance for credit losses 11,738,000   11,219,000      
Consumer            
Assets:            
Allowance for credit losses 3,603,000   3,330,000      
Consumer finance            
Assets:            
Loans, gross 475,028,000          
Allowance for credit losses $ 25,187,000   25,969,000 $ 25,868,000   $ 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