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Loans, net and allowance for loan losses - Changes in Allowance for Loan Losses Account by Major Classification of Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Allowance for loan losses:            
Beginning Balance $ 19,718 $ 16,969 $ 18,960 $ 15,961    
Charge-offs (1,398) (431) (1,824) (742)    
Recoveries 203 64 337 183    
Provisions 1,050 1,200 2,100 2,400    
Ending balance 19,573 17,802 19,573 17,802    
Beginning Balance 19,718 16,969 18,960 15,961    
Ending balance: individually evaluated for impairment         $ 1,029 $ 766
Charge-offs (1,398) (431) (1,824) (742)    
Ending balance: collectively evaluated for impairment         18,544 18,194
Recoveries 203 64 337 183    
Ending balance: loans acquired with deteriorated credit quality 19,718 16,969 18,960 15,961 19,573 18,960
Provisions 1,050 1,200 2,100 2,400    
Loans receivable:            
Total Loans         1,753,389 1,693,065
Ending balance: individually evaluated for impairment         9,637 9,705
Ending balance: collectively evaluated for impairment         1,742,847 1,682,343
Total Loans         1,753,389 1,693,065
Ending balance 19,573 17,802 19,573 17,802    
Ending balance: individually evaluated for impairment         9,637 9,705
Ending balance: collectively evaluated for impairment         1,742,847 1,682,343
Loans Acquired with Deteriorated Credit Quality            
Loans receivable:            
Ending balance         905 1,017
Ending balance         905 1,017
Commercial            
Allowance for loan losses:            
Beginning Balance 5,406 4,129 5,052 3,799    
Charge-offs (2) (32) (2) (32)    
Recoveries 59 6 116 13    
Provisions 286 323 583 646    
Ending balance 5,749 4,426 5,749 4,426    
Beginning Balance 5,406 4,129 5,052 3,799    
Ending balance: individually evaluated for impairment         146 159
Charge-offs (2) (32) (2) (32)    
Ending balance: collectively evaluated for impairment         5,603 4,893
Recoveries 59 6 116 13    
Ending balance: loans acquired with deteriorated credit quality 5,406 4,129 5,052 3,799 5,749 5,052
Provisions 286 323 583 646    
Loans receivable:            
Total Loans         469,318 476,199
Ending balance: individually evaluated for impairment         1,972 2,121
Ending balance: collectively evaluated for impairment         467,035 473,736
Total Loans         469,318 476,199
Ending balance 5,749 4,426 5,749 4,426    
Ending balance: individually evaluated for impairment         1,972 2,121
Ending balance: collectively evaluated for impairment         467,035 473,736
Commercial | Loans Acquired with Deteriorated Credit Quality            
Loans receivable:            
Ending balance         311 342
Ending balance         311 342
Real estate Commercial            
Allowance for loan losses:            
Beginning Balance 8,099 6,291 7,548 5,847    
Charge-offs (1,169) (242) (1,169) (367)    
Recoveries 30 22 57 55    
Provisions 546 516 1,070 1,052    
Ending balance 7,506 6,587 7,506 6,587    
Beginning Balance 8,099 6,291 7,548 5,847    
Ending balance: individually evaluated for impairment         502 263
Charge-offs (1,169) (242) (1,169) (367)    
Ending balance: collectively evaluated for impairment         7,004 7,285
Recoveries 30 22 57 55    
Ending balance: loans acquired with deteriorated credit quality 8,099 6,291 7,548 5,847 7,506 7,548
Provisions 546 516 1,070 1,052    
Loans receivable:            
Total Loans         867,349 786,210
Ending balance: individually evaluated for impairment         4,060 3,644
Ending balance: collectively evaluated for impairment         862,723 781,921
Total Loans         867,349 786,210
Ending balance 7,506 6,587 7,506 6,587    
Ending balance: individually evaluated for impairment         4,060 3,644
Ending balance: collectively evaluated for impairment         862,723 781,921
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality            
Loans receivable:            
Ending balance         566 645
Ending balance         566 645
Real estate Residential            
Allowance for loan losses:            
Beginning Balance 4,839 4,978 4,980 4,707    
Charge-offs (82) (8) (381) (23)    
Recoveries 57 4 67 26    
Provisions 148 222 296 486    
Ending balance 4,962 5,196 4,962 5,196    
Beginning Balance 4,839 4,978 4,980 4,707    
Ending balance: individually evaluated for impairment         378 336
Charge-offs (82) (8) (381) (23)    
Ending balance: collectively evaluated for impairment         4,584 4,644
Recoveries 57 4 67 26    
Ending balance: loans acquired with deteriorated credit quality 4,839 4,978 4,980 4,707 4,962 4,980
Provisions 148 222 296 486    
Loans receivable:            
Total Loans         290,831 287,935
Ending balance: individually evaluated for impairment         3,542 3,763
Ending balance: collectively evaluated for impairment         287,261 284,142
Total Loans         290,831 287,935
Ending balance 4,962 5,196 4,962 5,196    
Ending balance: individually evaluated for impairment         3,542 3,763
Ending balance: collectively evaluated for impairment         287,261 284,142
Real estate Residential | Loans Acquired with Deteriorated Credit Quality            
Loans receivable:            
Ending balance         28 30
Ending balance         28 30
Real estate Residential            
Loans receivable:            
Total Loans         290,831 287,935
Total Loans         290,831 287,935
Consumer            
Allowance for loan losses:            
Beginning Balance 1,374 1,571 1,380 1,608    
Charge-offs (145) (149) (272) (320)    
Recoveries 57 32 97 89    
Provisions 70 139 151 216    
Ending balance 1,356 1,593 1,356 1,593    
Beginning Balance 1,374 1,571 1,380 1,608    
Ending balance: individually evaluated for impairment         3 8
Charge-offs (145) (149) (272) (320)    
Ending balance: collectively evaluated for impairment         1,353 1,372
Recoveries 57 32 97 89    
Ending balance: loans acquired with deteriorated credit quality 1,374 1,571 1,380 1,608 1,356 1,380
Provisions 70 139 151 216    
Loans receivable:            
Total Loans         125,891 142,721
Ending balance: individually evaluated for impairment         63 177
Ending balance: collectively evaluated for impairment         125,828 142,544
Total Loans         125,891 142,721
Ending balance $ 1,356 $ 1,593 $ 1,356 $ 1,593    
Ending balance: individually evaluated for impairment         63 177
Ending balance: collectively evaluated for impairment         $ 125,828 $ 142,544