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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
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2023
Allowance for loan losses:        
Beginning balance $ 27,472 $ 28,383 $ 27,344  
Charge-offs   (787) (956)  
Charge-offs (3,025)      
Recoveries   325 245  
Recoveries 165      
Provisions (credits) 566 (449) 1,750  
Ending balance   27,472 28,383  
Ending balance 21,895      
Ending balance: individually evaluated for impairment   40 175  
Ending balance: individually evaluated for impairment 31      
Ending balance: collectively evaluated for impairment   27,432 28,208  
Ending balance: collectively evaluated for impairment 21,864      
Loans receivable:        
Loans 3,025      
Loans 2,849,897      
Ending balance   2,730,116 2,329,173  
Ending balance: individually evaluated for impairment   3,921 4,362  
Ending balance: collectively evaluated for impairment 2,845,167 2,726,195 2,324,811  
ASC 326        
Allowance for loan losses:        
Beginning balance (3,283)      
Ending balance   (3,283)    
Cumulative impact of adoption | ASC 326        
Allowance for loan losses:        
Beginning Balance 24,189      
Ending balance   24,189   $ 3,000
Real estate        
Loans receivable:        
Ending balance: individually evaluated for impairment 4,730      
Non-real estate        
Loans receivable:        
Ending balance: individually evaluated for impairment 10      
Commercial        
Allowance for loan losses:        
Beginning balance 4,365 6,498 7,849  
Charge-offs   (161) (492)  
Charge-offs (58)      
Recoveries   40 89  
Recoveries 11      
Provisions (credits) (363) (2,012) (948)  
Ending balance   4,365 6,498  
Ending balance 2,272      
Ending balance: individually evaluated for impairment   19 40  
Ending balance: individually evaluated for impairment 10      
Ending balance: collectively evaluated for impairment   4,346 6,458  
Ending balance: collectively evaluated for impairment 2,262      
Loans receivable:        
Loans 58      
Loans 368,411      
Ending balance   433,048 554,547  
Ending balance: individually evaluated for impairment   98 199  
Ending balance: collectively evaluated for impairment 368,404 432,950 554,348  
Commercial | ASC 326        
Allowance for loan losses:        
Beginning balance (1,683)      
Ending balance   (1,683)    
Commercial | Cumulative impact of adoption | ASC 326        
Allowance for loan losses:        
Beginning Balance 2,682      
Ending balance   2,682    
Commercial | Real estate        
Loans receivable:        
Ending balance: individually evaluated for impairment 7      
Commercial | Non-real estate        
Loans receivable:        
Ending balance: individually evaluated for impairment 10      
Municipal        
Allowance for loan losses:        
Beginning balance 1,247 1,955 885  
Provisions (credits) (1,206) (708) 1,070  
Ending balance   1,247 1,955  
Ending balance 788      
Ending balance: collectively evaluated for impairment   1,247 1,955  
Ending balance: collectively evaluated for impairment 788      
Loans receivable:        
Loans 175,304      
Ending balance   166,210 58,580  
Ending balance: collectively evaluated for impairment 175,304 166,210 58,580  
Municipal | ASC 326        
Allowance for loan losses:        
Beginning balance 747      
Ending balance   747    
Municipal | Cumulative impact of adoption | ASC 326        
Allowance for loan losses:        
Beginning Balance 1,994      
Ending balance   1,994    
Commercial real estate        
Allowance for loan losses:        
Beginning balance 17,915 15,928 14,559  
Charge-offs   (284) (252)  
Charge-offs (2,598)      
Recoveries   110 68  
Recoveries 1      
Provisions (credits) 2,179 2,161 1,553  
Ending balance   17,915 15,928  
Ending balance 14,153      
Ending balance: individually evaluated for impairment     109  
Ending balance: individually evaluated for impairment 21      
Ending balance: collectively evaluated for impairment   17,915 15,819  
Ending balance: collectively evaluated for impairment 14,132      
Loans receivable:        
Loans 2,598      
Loans 1,863,118      
Ending balance   1,709,827 1,343,539  
Ending balance: individually evaluated for impairment   2,063 2,890  
Ending balance: collectively evaluated for impairment 1,860,144 1,707,764 1,340,649  
Commercial real estate | ASC 326        
Allowance for loan losses:        
Beginning balance (3,344)      
Ending balance   (3,344)    
Commercial real estate | Cumulative impact of adoption | ASC 326        
Allowance for loan losses:        
Beginning Balance 14,571      
Ending balance   14,571    
Commercial real estate | Real estate        
Loans receivable:        
Ending balance: individually evaluated for impairment 2,974      
Residential real estate        
Allowance for loan losses:        
Beginning balance 3,072 3,209 3,129  
Charge-offs   (31) (24)  
Recoveries   4 7  
Recoveries 24      
Provisions (credits) (281) (110) 97  
Ending balance   3,072 3,209  
Ending balance 3,782      
Ending balance: individually evaluated for impairment   21 26  
Ending balance: collectively evaluated for impairment   3,051 3,183  
Ending balance: collectively evaluated for impairment 3,782      
Loans receivable:        
Loans 360,803      
Ending balance   330,728 297,624  
Ending balance: individually evaluated for impairment   1,760 1,273  
Ending balance: collectively evaluated for impairment 359,054 328,968 296,351  
Residential real estate | ASC 326        
Allowance for loan losses:        
Beginning balance 967      
Ending balance   967    
Residential real estate | Cumulative impact of adoption | ASC 326        
Allowance for loan losses:        
Beginning Balance 4,039      
Ending balance   4,039    
Residential real estate | Real estate        
Loans receivable:        
Ending balance: individually evaluated for impairment 1,749      
Consumer        
Allowance for loan losses:        
Beginning balance 873 793 922  
Charge-offs   (311) (188)  
Charge-offs (369)      
Recoveries   171 81  
Recoveries 129      
Provisions (credits) 237 220 (22)  
Ending balance   873 793  
Ending balance 900      
Ending balance: collectively evaluated for impairment   873 793  
Ending balance: collectively evaluated for impairment 900      
Loans receivable:        
Loans 369      
Loans 82,261      
Ending balance   90,303 74,883  
Ending balance: collectively evaluated for impairment 82,261 90,303 $ 74,883  
Consumer | ASC 326        
Allowance for loan losses:        
Beginning balance 30      
Ending balance   30    
Consumer | Cumulative impact of adoption | ASC 326        
Allowance for loan losses:        
Beginning Balance $ 903      
Ending balance   $ 903