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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, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Allowance for loan losses:              
Beginning Balance $ 16,969 $ 14,158 $ 12,975 $ 15,961 $ 12,975    
Charge-offs (431)   (632) (742) (755)    
Recoveries 64   73 183 179    
Provisions 1,200 1,200 1,200 2,400 2,400    
Ending balance 17,802 14,799 14,158 17,802 14,799    
Beginning Balance 16,969 14,158 12,975 15,961 12,975    
Ending balance: individually evaluated for impairment           $ 1,335 $ 1,942
Charge-offs (431)   (632) (742) (755)    
Ending balance: collectively evaluated for impairment           16,467 14,019
Recoveries 64   73 183 179    
Ending balance: loans acquired with deteriorated credit quality 16,969 14,158 12,975 15,961 12,975 17,802 15,961
Provisions 1,200 1,200 1,200 2,400 2,400    
Loans receivable:              
Total Loans           1,597,362 1,532,965
Ending balance: individually evaluated for impairment           9,412 11,242
Ending balance: collectively evaluated for impairment           1,586,905 1,519,386
Total Loans           1,597,362 1,532,965
Ending balance 17,802 14,799 14,158 17,802 14,799    
Ending balance: individually evaluated for impairment           9,412 11,242
Ending balance: collectively evaluated for impairment           1,586,905 1,519,386
Loans Acquired with Deteriorated Credit Quality              
Loans receivable:              
Ending balance           1,045 2,337
Ending balance           1,045 2,337
Commercial              
Allowance for loan losses:              
Beginning Balance 4,129 3,322 3,042 3,799 3,042    
Charge-offs (32)   (393) (32) (396)    
Recoveries 6   34 13 36    
Provisions 323   300 646 581    
Ending balance 4,426 3,263 3,322 4,426 3,263    
Beginning Balance 4,129 3,322 3,042 3,799 3,042    
Ending balance: individually evaluated for impairment           322 225
Charge-offs (32)   (393) (32) (396)    
Ending balance: collectively evaluated for impairment           4,104 3,574
Recoveries 6   34 13 36    
Ending balance: loans acquired with deteriorated credit quality 4,129 3,322 3,042 3,799 3,042 4,426 3,799
Provisions 323   300 646 581    
Loans receivable:              
Total Loans           452,180 408,814
Ending balance: individually evaluated for impairment           1,944 1,724
Ending balance: collectively evaluated for impairment           449,868 406,127
Total Loans           452,180 408,814
Ending balance 4,426 3,263 3,322 4,426 3,263    
Ending balance: individually evaluated for impairment           1,944 1,724
Ending balance: collectively evaluated for impairment           449,868 406,127
Commercial | Loans Acquired with Deteriorated Credit Quality              
Loans receivable:              
Ending balance           368 963
Ending balance           368 963
Real estate Commercial              
Allowance for loan losses:              
Beginning Balance 6,291 4,616 4,245 5,847 4,245    
Charge-offs (242)   (48) (367) (103)    
Recoveries 22   14 55 30    
Provisions 516   495 1,052 905    
Ending balance 6,587 5,077 4,616 6,587 5,077    
Beginning Balance 6,291 4,616 4,245 5,847 4,245    
Ending balance: individually evaluated for impairment           509 1,197
Charge-offs (242)   (48) (367) (103)    
Ending balance: collectively evaluated for impairment           6,078 4,650
Recoveries 22   14 55 30    
Ending balance: loans acquired with deteriorated credit quality 6,291 4,616 4,245 5,847 4,245 6,587 5,847
Provisions 516   495 1,052 905    
Loans receivable:              
Total Loans           719,652 700,144
Ending balance: individually evaluated for impairment           3,951 5,820
Ending balance: collectively evaluated for impairment           715,056 692,987
Total Loans           719,652 700,144
Ending balance 6,587 5,077 4,616 6,587 5,077    
Ending balance: individually evaluated for impairment           3,951 5,820
Ending balance: collectively evaluated for impairment           715,056 692,987
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality              
Loans receivable:              
Ending balance           645 1,337
Ending balance           645 1,337
Real estate Residential              
Allowance for loan losses:              
Beginning Balance 4,978 4,359 4,082 4,707 4,082    
Charge-offs (8)   (126) (23) (126)    
Recoveries 4   10 26 35    
Provisions 222   222 486 474    
Ending balance 5,196 4,465 4,359 5,196 4,465    
Beginning Balance 4,978 4,359 4,082 4,707 4,082    
Ending balance: individually evaluated for impairment           461 520
Charge-offs (8)   (126) (23) (126)    
Ending balance: collectively evaluated for impairment           4,735 4,187
Recoveries 4   10 26 35    
Ending balance: loans acquired with deteriorated credit quality 4,978 4,359 4,082 4,707 4,082 5,196 4,707
Provisions 222   222 486 474    
Loans receivable:              
Total Loans           286,232 289,781
Ending balance: individually evaluated for impairment           3,285 3,543
Ending balance: collectively evaluated for impairment           282,915 286,201
Total Loans           286,232 289,781
Ending balance 5,196 4,465 4,359 5,196 4,465    
Ending balance: individually evaluated for impairment           3,285 3,543
Ending balance: collectively evaluated for impairment           282,915 286,201
Real estate Residential | Loans Acquired with Deteriorated Credit Quality              
Loans receivable:              
Ending balance           32 37
Ending balance           32 37
Consumer              
Allowance for loan losses:              
Beginning Balance 1,571 1,646 1,583 1,608 1,583    
Charge-offs (149)   (65) (320) (130)    
Recoveries 32   15 89 78    
Provisions 139   83 216 148    
Ending balance 1,593 1,679 1,646 1,593 1,679    
Beginning Balance 1,571 1,646 1,583 1,608 1,583    
Ending balance: individually evaluated for impairment           43  
Charge-offs (149)   (65) (320) (130)    
Ending balance: collectively evaluated for impairment           1,550 1,608
Recoveries 32   15 89 78    
Ending balance: loans acquired with deteriorated credit quality 1,571 1,646 1,583 1,608 1,583 1,593 1,608
Provisions 139   83 216 148    
Loans receivable:              
Total Loans           139,298 134,226
Ending balance: individually evaluated for impairment           232 155
Ending balance: collectively evaluated for impairment           139,066 134,071
Total Loans           139,298 134,226
Ending balance $ 1,593 1,679 1,646 $ 1,593 1,679    
Ending balance: individually evaluated for impairment           232 155
Ending balance: collectively evaluated for impairment           $ 139,066 $ 134,071
Unallocated              
Allowance for loan losses:              
Beginning Balance   215 23   23    
Provisions     100   292    
Ending balance   315 215   315    
Beginning Balance   215 23   23    
Ending balance: loans acquired with deteriorated credit quality   215 23   23    
Provisions     100   292    
Loans receivable:              
Ending balance   $ 315 $ 215   $ 315