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Loans - Allowance by portfolio segment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Allowance for credit losses          
Beginning balance $ 24,726 $ 18,427 $ 21,832 $ 17,661  
Provision for credit / loan losses 214 5,510 1,747 6,433  
Charge-offs (192) (340) (370) (507)  
Recoveries 100 45 211 55  
Ending balance 24,848 23,642 24,848 23,642  
Allowance for credit losses:          
individually evaluated for impairment         $ 1,033
Individually evaluated for impairment 920   920    
collectively evaluated for impairment         20,799
collectively evaluated for impairment 23,928   23,928    
Total ending allowance balance 24,848 23,642 24,848 23,642 21,832
Loans:          
individually evaluated for impairment         25,368
individually evaluated for impairment 24,321   24,321    
collectively evaluated for impairment         1,544,062
Collectively evaluated for impairment 1,688,792   1,688,792    
Total ending loans balance         1,569,430
Total ending loans balance 1,713,113   1,713,113   1,569,430
Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses          
Beginning balance     1,900    
Allowance for credit losses:          
Total ending allowance balance         1,900
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses          
Beginning balance     1,428    
Allowance for credit losses:          
Total ending allowance balance         1,428
Commercial and industrial. | Commercial and industrial          
Allowance for credit losses          
Beginning balance 5,141 5,408 5,510 4,901  
Provision for credit / loan losses 186 3,944 (151) 4,492  
Charge-offs (192) (29) (334) (76)  
Recoveries 20 9 58 15  
Ending balance 5,155 9,332 5,155 9,332  
Allowance for credit losses:          
individually evaluated for impairment         653
Individually evaluated for impairment 554   554    
collectively evaluated for impairment         4,857
collectively evaluated for impairment 4,601   4,601    
Total ending allowance balance 5,155 9,332 5,155 9,332 5,510
Loans:          
individually evaluated for impairment         1,003
individually evaluated for impairment 641   641    
collectively evaluated for impairment         257,898
Collectively evaluated for impairment 256,874   256,874    
Total ending loans balance         258,901
Total ending loans balance 257,515   257,515    
Commercial and industrial. | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses          
Beginning balance     72    
Allowance for credit losses:          
Total ending allowance balance         72
Commercial and industrial. | Paycheck Protection Program          
Loans:          
Total ending loans balance         1,717
Total ending loans balance 1,535   1,535    
Commercial real estate. | Commercial real estate          
Allowance for credit losses          
Beginning balance 16,698 11,073 14,364 11,183  
Provision for credit / loan losses 421 1,230 1,005 1,120  
Recoveries     13    
Ending balance 17,119 12,303 17,119 12,303  
Allowance for credit losses:          
individually evaluated for impairment         380
Individually evaluated for impairment 366   366    
collectively evaluated for impairment         13,984
collectively evaluated for impairment 16,753   16,753    
Total ending allowance balance 17,119 12,303 17,119 12,303 14,364
Loans:          
individually evaluated for impairment         22,956
individually evaluated for impairment 22,287   22,287    
collectively evaluated for impairment         1,075,098
Collectively evaluated for impairment 1,190,826   1,190,826    
Total ending loans balance         1,098,054
Total ending loans balance 1,213,113   1,213,113    
Commercial real estate. | Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses          
Beginning balance     1,737    
Allowance for credit losses:          
Total ending allowance balance         1,737
Commercial real estate. | Commercial real estate construction          
Allowance for credit losses          
Beginning balance 1,625 1,296 1,252 964  
Provision for credit / loan losses (565) 22 (184) 354  
Ending balance 1,060 1,318 1,060 1,318  
Allowance for credit losses:          
collectively evaluated for impairment         1,252
collectively evaluated for impairment 1,060   1,060    
Total ending allowance balance 1,060 1,318 1,060 1,318 1,252
Loans:          
collectively evaluated for impairment         109,570
Collectively evaluated for impairment 116,919   116,919    
Total ending loans balance         109,570
Total ending loans balance 116,919   116,919    
Commercial real estate. | Commercial real estate construction | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses          
Beginning balance     (8)    
Allowance for credit losses:          
Total ending allowance balance         (8)
Residential real estate. | Residential real estate          
Allowance for credit losses          
Beginning balance 1,048 294 345 272  
Provision for credit / loan losses (56) 56 874 78  
Charge-offs   (51)   (51)  
Ending balance 992 299 992 299  
Allowance for credit losses:          
collectively evaluated for impairment         345
collectively evaluated for impairment 992   992    
Total ending allowance balance 992 299 992 299 345
Loans:          
individually evaluated for impairment         1,254
individually evaluated for impairment 1,247   1,247    
collectively evaluated for impairment         73,023
Collectively evaluated for impairment 82,048   82,048    
Total ending loans balance         74,277
Total ending loans balance 83,295   83,295    
Residential real estate. | Residential real estate | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses          
Beginning balance     (227)    
Allowance for credit losses:          
Total ending allowance balance         (227)
Residential real estate. | Home equity          
Allowance for credit losses          
Beginning balance 72 69 63 80  
Provision for credit / loan losses (26) (1)   (12)  
Ending balance 46 68 46 68  
Allowance for credit losses:          
collectively evaluated for impairment         63
collectively evaluated for impairment 46   46    
Total ending allowance balance 46 68 46 68 63
Loans:          
individually evaluated for impairment         51
individually evaluated for impairment 47   47    
collectively evaluated for impairment         12,278
Collectively evaluated for impairment 12,002   12,002    
Total ending loans balance         12,329
Total ending loans balance 12,049   12,049    
Residential real estate. | Home equity | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses          
Beginning balance     (17)    
Allowance for credit losses:          
Total ending allowance balance         (17)
Consumer          
Allowance for credit losses          
Beginning balance 142 287 298 261  
Provision for credit / loan losses 254 259 203 401  
Charge-offs   (260) (36) (380)  
Recoveries 80 36 140 40  
Ending balance 476 322 476 322  
Allowance for credit losses:          
collectively evaluated for impairment         298
collectively evaluated for impairment 476   476    
Total ending allowance balance 476 $ 322 476 $ 322 298
Loans:          
individually evaluated for impairment         104
individually evaluated for impairment 99   99    
collectively evaluated for impairment         16,195
Collectively evaluated for impairment 30,123   30,123    
Total ending loans balance         16,299
Total ending loans balance $ 30,222   30,222    
Consumer | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses          
Beginning balance     $ (129)    
Allowance for credit losses:          
Total ending allowance balance         $ (129)