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Loans, net and allowance for credit losses - Allocation of Allowance for Loan Losses and Related Loans by Major Classification of Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Allowance for loan losses:            
Ending balance $ 23,218 $ 25,444 $ 27,472 $ 29,374 $ 28,407 $ 28,383
Ending balance     27,472      
Ending balance: individually evaluated for impairment     40      
Ending balance: individually evaluated for impairment 12          
Ending balance: collectively evaluated for impairment     27,432      
Ending balance: collectively evaluated for impairment 23,206          
Loans receivable:            
Loans 2,843,238          
Ending balance     2,730,116      
Ending balance: individually evaluated for impairment     3,921      
Ending balance: collectively evaluated for impairment 2,841,312   2,726,195      
Real estate            
Loans receivable:            
Ending balance: individually evaluated for impairment 1,914          
Non-real estate            
Loans receivable:            
Ending balance: individually evaluated for impairment 12          
Commercial            
Allowance for loan losses:            
Ending balance 2,751 2,481 4,365 6,522 6,427 7,466
Ending balance     4,365      
Ending balance: individually evaluated for impairment     19      
Ending balance: individually evaluated for impairment 12          
Ending balance: collectively evaluated for impairment     4,346      
Ending balance: collectively evaluated for impairment 2,739          
Loans receivable:            
Loans 437,012          
Ending balance     433,048      
Ending balance: individually evaluated for impairment     98      
Ending balance: collectively evaluated for impairment 436,991   432,950      
Commercial | Real estate            
Loans receivable:            
Ending balance: individually evaluated for impairment 9          
Commercial | Non-real estate            
Loans receivable:            
Ending balance: individually evaluated for impairment 12          
Municipal            
Allowance for loan losses:            
Ending balance 827 2,318 1,247 1,244 1,166 987
Ending balance     1,247      
Ending balance: collectively evaluated for impairment     1,247      
Ending balance: collectively evaluated for impairment 827          
Loans receivable:            
Loans 172,875          
Ending balance     166,210      
Ending balance: collectively evaluated for impairment 172,875   166,210      
Commercial real estate            
Allowance for loan losses:            
Ending balance 14,961 15,692 17,915 17,569 16,789 15,928
Ending balance     17,915      
Ending balance: collectively evaluated for impairment     17,915      
Ending balance: collectively evaluated for impairment 14,961          
Loans receivable:            
Loans 1,794,355          
Ending balance     1,709,827      
Ending balance: individually evaluated for impairment     2,063      
Ending balance: collectively evaluated for impairment 1,793,508   1,707,764      
Commercial real estate | Real estate            
Loans receivable:            
Ending balance: individually evaluated for impairment 847          
Residential real estate            
Allowance for loan losses:            
Ending balance 3,767 3,868 3,072 3,220 3,255 3,209
Ending balance     3,072      
Ending balance: individually evaluated for impairment     21      
Ending balance: collectively evaluated for impairment     3,051      
Ending balance: collectively evaluated for impairment 3,767          
Loans receivable:            
Loans 348,911          
Ending balance     330,728      
Ending balance: individually evaluated for impairment     1,760      
Ending balance: collectively evaluated for impairment 347,853   328,968      
Residential real estate | Real estate            
Loans receivable:            
Ending balance: individually evaluated for impairment 1,058          
Consumer            
Allowance for loan losses:            
Ending balance 912 $ 1,085 873 $ 819 $ 770 $ 793
Ending balance     873      
Ending balance: collectively evaluated for impairment     873      
Ending balance: collectively evaluated for impairment 912          
Loans receivable:            
Loans 90,085          
Ending balance     90,303      
Ending balance: collectively evaluated for impairment $ 90,085   $ 90,303