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Loans - Allowance for loan losses by portfolio segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Allowance for loan losses:    
Beginning balance $ 16,172 $ 12,275
Provision for loan losses 2,428 5,413
Charge-offs (1,267) (1,537)
Recoveries 328 21
Ending balance 17,661 16,172
Allowance for loan losses:    
individually evaluated for impairment 1,433 1,332
collectively evaluated for impairment 16,228 14,840
Total ending allowance balance 17,661 16,172
Loans:    
individually evaluated for impairment 25,866 23,651
collectively evaluated for impairment 1,265,562 1,129,087
Total ending loans balance 1,291,428 1,152,738
Commercial and industrial. | Commercial and industrial    
Allowance for loan losses:    
Beginning balance 4,795 5,107
Provision for loan losses 828 917
Charge-offs (942) (1,239)
Recoveries 220 10
Ending balance 4,901 4,795
Allowance for loan losses:    
individually evaluated for impairment 137 206
collectively evaluated for impairment 4,764 4,589
Total ending allowance balance 4,901 4,795
Loans:    
individually evaluated for impairment 952 2,410
collectively evaluated for impairment 267,556 296,639
Total ending loans balance 268,508 299,049
Commercial and industrial. | Paycheck Protection Program    
Loans:    
Total ending loans balance 38,100 69,000
Commercial real estate. | Commercial real estate    
Allowance for loan losses:    
Beginning balance 9,782 5,951
Provision for loan losses 1,326 4,046
Charge-offs   (219)
Recoveries 75 4
Ending balance 11,183 9,782
Allowance for loan losses:    
individually evaluated for impairment 1,272 1,084
collectively evaluated for impairment 9,911 8,698
Total ending allowance balance 11,183 9,782
Loans:    
individually evaluated for impairment 23,523 19,759
collectively evaluated for impairment 829,184 678,371
Total ending loans balance 852,707 698,130
Commercial real estate. | Commercial real estate construction    
Allowance for loan losses:    
Beginning balance 801 713
Provision for loan losses 163 88
Ending balance 964 801
Allowance for loan losses:    
collectively evaluated for impairment 964 801
Total ending allowance balance 964 801
Loans:    
collectively evaluated for impairment 72,250 63,544
Total ending loans balance 72,250 63,544
Residential real estate. | Residential real estate    
Allowance for loan losses:    
Beginning balance 381 384
Provision for loan losses (98) 48
Charge-offs (11) (51)
Ending balance 272 381
Allowance for loan losses:    
individually evaluated for impairment   15
collectively evaluated for impairment 272 366
Total ending allowance balance 272 381
Loans:    
individually evaluated for impairment 1,227 1,358
collectively evaluated for impairment 64,021 56,583
Total ending loans balance 65,248 57,941
Residential real estate. | Home equity    
Allowance for loan losses:    
Beginning balance 77 43
Provision for loan losses 3 34
Ending balance 80 77
Allowance for loan losses:    
collectively evaluated for impairment 80 77
Total ending allowance balance 80 77
Loans:    
individually evaluated for impairment 50  
collectively evaluated for impairment 13,588 13,960
Total ending loans balance 13,638 13,960
Consumer    
Allowance for loan losses:    
Beginning balance 336 77
Provision for loan losses 206 280
Charge-offs (314) (28)
Recoveries 33 7
Ending balance 261 336
Allowance for loan losses:    
individually evaluated for impairment 24 27
collectively evaluated for impairment 237 309
Total ending allowance balance 261 336
Loans:    
individually evaluated for impairment 114 124
collectively evaluated for impairment 18,963 19,990
Total ending loans balance $ 19,077 $ 20,114