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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 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for loan losses:                            
Beginning Balance       $ 12,975       $ 10,338 $ 12,975 $ 10,338 $ 8,651      
Charge-offs                 (2,468) (1,427) (2,291)      
Recoveries                 454 364 454      
Provisions $ 1,400 $ 1,200 $ 1,200 1,200 $ 1,300 $ 900 $ 750 750 5,000 3,700 3,524      
Ending balance 15,961       12,975       15,961 12,975 10,338      
Beginning Balance       12,975       10,338 12,975 10,338 8,651      
Ending balance: individually evaluated for impairment                       $ 1,942 $ 2,140 $ 2,682
Charge-offs                 (2,468) (1,427) (2,291)      
Ending balance: collectively evaluated for impairment                       14,019 10,728 7,379
Recoveries                 454 364 454      
Ending balance: loans acquired with deteriorated credit quality 15,961     12,975 12,975     10,338 12,975 10,338 8,651 15,961 12,975 10,338
Provisions 1,400 $ 1,200 $ 1,200 1,200 1,300 $ 900 $ 750 750 5,000 3,700 3,524      
Loans receivable:                            
Total Loans                       1,532,965 1,340,865 1,209,894
Ending balance: individually evaluated for impairment                       11,242 10,267 11,807
Ending balance: collectively evaluated for impairment                       1,519,386 1,328,230 1,195,303
Ending balance                       2,337 2,368 2,784
Total Loans                       1,532,965 1,340,865 1,209,894
Ending balance 15,961       12,975       15,961 12,975 10,338      
Ending balance: individually evaluated for impairment                       11,242 10,267 11,807
Ending balance: collectively evaluated for impairment                       1,519,386 1,328,230 1,195,303
Ending balance                       2,337 2,368 2,784
Loans Acquired with Deteriorated Credit Quality                            
Allowance for loan losses:                            
Beginning Balance       107       277 107 277        
Ending balance         107         107 277      
Beginning Balance       107       277 107 277        
Ending balance: loans acquired with deteriorated credit quality       107 107     277 107 277 277   107 277
Loans receivable:                            
Ending balance         107         107 277      
Commercial                            
Allowance for loan losses:                            
Beginning Balance       3,042       2,321 3,042 2,321 2,008      
Charge-offs                 (776) (246) (601)      
Recoveries                 86 77 9      
Provisions                 1,447 890 905      
Ending balance 3,799       3,042       3,799 3,042 2,321      
Beginning Balance       3,042       2,321 3,042 2,321 2,008      
Ending balance: individually evaluated for impairment                       225 759 1,072
Charge-offs                 (776) (246) (601)      
Ending balance: collectively evaluated for impairment                       3,574 2,283 1,081
Recoveries                 86 77 9      
Ending balance: loans acquired with deteriorated credit quality 3,799     3,042 3,042     2,321 3,042 2,321 2,008 3,799 3,042 2,321
Provisions                 1,447 890 905      
Loans receivable:                            
Total Loans                       408,814 365,767 319,590
Ending balance: individually evaluated for impairment                       1,724 1,196 2,595
Ending balance: collectively evaluated for impairment                       406,127 363,620 315,642
Ending balance                       963 951 1,353
Total Loans                       408,814 365,767 319,590
Ending balance 3,799       3,042       3,799 3,042 2,321      
Ending balance: individually evaluated for impairment                       1,724 1,196 2,595
Ending balance: collectively evaluated for impairment                       406,127 363,620 315,642
Ending balance                       963 951 1,353
Commercial | Loans Acquired with Deteriorated Credit Quality                            
Allowance for loan losses:                            
Beginning Balance               168   168        
Ending balance                     168      
Beginning Balance               168   168        
Ending balance: loans acquired with deteriorated credit quality               168   168 168     168
Loans receivable:                            
Ending balance                     168      
Real estate Commercial                            
Allowance for loan losses:                            
Beginning Balance       4,245       3,037 4,245 3,037 2,394      
Charge-offs                 (858) (325) (500)      
Recoveries                 122 144 292      
Provisions                 2,338 1,389 851      
Ending balance 5,847       4,245       5,847 4,245 3,037      
Beginning Balance       4,245       3,037 4,245 3,037 2,394      
Ending balance: individually evaluated for impairment                       1,197 126 805
Charge-offs                 (858) (325) (500)      
Ending balance: collectively evaluated for impairment                       4,650 4,012 2,125
Recoveries                 122 144 292      
Ending balance: loans acquired with deteriorated credit quality 5,847     4,245 4,245     3,037 4,245 3,037 2,394 5,847 4,245 3,037
Provisions                 2,338 1,389 851      
Loans receivable:                            
Total Loans                       700,144 567,277 493,481
Ending balance: individually evaluated for impairment                       5,820 4,006 5,084
Ending balance: collectively evaluated for impairment                       692,987 561,903 487,024
Ending balance                       1,337 1,368 1,373
Total Loans                       700,144 567,277 493,481
Ending balance 5,847       4,245       5,847 4,245 3,037      
Ending balance: individually evaluated for impairment                       5,820 4,006 5,084
Ending balance: collectively evaluated for impairment                       692,987 561,903 487,024
Ending balance                       1,337 1,368 1,373
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality                            
Allowance for loan losses:                            
Beginning Balance       107       107 107 107        
Ending balance         107         107 107      
Beginning Balance       107       107 107 107        
Ending balance: loans acquired with deteriorated credit quality       107 107     107 107 107 107   107 107
Loans receivable:                            
Ending balance         107         107 107      
Real estate Residential                            
Allowance for loan losses:                            
Beginning Balance       4,082       3,690 4,082 3,690 3,135      
Charge-offs                 (339) (523) (804)      
Recoveries                 69 26 38      
Provisions                 895 889 1,321      
Ending balance 4,707       4,082       4,707 4,082 3,690      
Beginning Balance       4,082       3,690 4,082 3,690 3,135      
Ending balance: individually evaluated for impairment                       520 1,138 767
Charge-offs                 (339) (523) (804)      
Ending balance: collectively evaluated for impairment                       4,187 2,944 2,921
Recoveries                 69 26 38      
Ending balance: loans acquired with deteriorated credit quality 4,707     4,082 4,082     3,690 4,082 3,690 3,135 4,707 4,082 3,690
Provisions                 895 889 1,321      
Loans receivable:                            
Total Loans                       289,781 306,218 322,454
Ending balance: individually evaluated for impairment                       3,543 4,917 4,001
Ending balance: collectively evaluated for impairment                       286,201 301,252 318,395
Ending balance                       37 49 58
Total Loans                       289,781 306,218 322,454
Ending balance 4,707       4,082       4,707 4,082 3,690      
Ending balance: individually evaluated for impairment                       3,543 4,917 4,001
Ending balance: collectively evaluated for impairment                       286,201 301,252 318,395
Ending balance                       37 49 58
Real estate Residential | Loans Acquired with Deteriorated Credit Quality                            
Allowance for loan losses:                            
Beginning Balance               2   2        
Ending balance                     2      
Beginning Balance               2   2        
Ending balance: loans acquired with deteriorated credit quality               2   2 2     2
Loans receivable:                            
Ending balance                     2      
Consumer                            
Allowance for loan losses:                            
Beginning Balance       1,583       1,290 1,583 1,290 1,114      
Charge-offs                 (495) (333) (386)      
Recoveries                 177 117 115      
Provisions                 343 509 447      
Ending balance 1,608       1,583       1,608 1,583 1,290      
Beginning Balance       1,583       1,290 1,583 1,290 1,114      
Ending balance: individually evaluated for impairment                         117 38
Charge-offs                 (495) (333) (386)      
Ending balance: collectively evaluated for impairment                       1,608 1,466 1,252
Recoveries                 177 117 115      
Ending balance: loans acquired with deteriorated credit quality 1,608     1,583 1,583     $ 1,290 1,583 1,290 1,114 1,608 1,583 1,290
Provisions                 343 509 447      
Loans receivable:                            
Total Loans                       134,226 101,603 74,369
Ending balance: individually evaluated for impairment                       155 148 127
Ending balance: collectively evaluated for impairment                       134,071 101,455 74,242
Total Loans                       134,226 101,603 74,369
Ending balance $ 1,608       1,583       1,608 1,583 $ 1,290      
Ending balance: individually evaluated for impairment                       155 148 127
Ending balance: collectively evaluated for impairment                       $ 134,071 101,455 $ 74,242
Unallocated                            
Allowance for loan losses:                            
Beginning Balance       23         23          
Provisions                 (23) 23        
Ending balance         23         23        
Beginning Balance       23         23          
Ending balance: collectively evaluated for impairment                         23  
Ending balance: loans acquired with deteriorated credit quality       $ 23 23       23 23     $ 23  
Provisions                 $ (23) 23        
Loans receivable:                            
Ending balance         $ 23         $ 23