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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for loan losses:                            
Beginning balance       $ 10,338       $ 8,651 $ 10,338 $ 8,651 $ 6,950      
Charge-offs                 (1,427) (2,291) (841)      
Recoveries                 364 454 181      
Provisions $ 1,300 $ 900 $ 750 750 $ 800 $ 666 $ 1,201 857 3,700 3,524 2,361      
Ending balance 12,975       10,338       12,975 10,338 8,651      
Beginning balance       10,338       8,651 10,338 8,651 6,950      
Ending balance: individually evaluated for impairment                       $ 2,140 $ 2,682 $ 2,024
Charge-offs                 (1,427) (2,291) (841)      
Ending balance: collectively evaluated for impairment                       10,728 7,379 6,627
Recoveries                 364 454 181      
Ending balance: loans acquired with deteriorated credit quality 12,975     10,338 10,338     8,651 10,338 8,651 6,950 12,975 10,338 8,651
Provisions 1,300 $ 900 $ 750 750 800 $ 666 $ 1,201 857 3,700 3,524 2,361      
Loans receivable:                            
Ending balance                       1,340,865 1,209,894 1,176,617
Ending balance: individually evaluated for impairment                       10,267 11,807 15,626
Ending balance: collectively evaluated for impairment                       1,328,230 1,195,303 1,153,671
Ending balance: loans acquired with deteriorated credit quality                       2,368 2,784 7,320
Ending balance                       1,340,865 1,209,894 1,176,617
Ending balance 12,975       10,338       12,975 10,338 8,651      
Ending balance: individually evaluated for impairment                       10,267 11,807 15,626
Ending balance: collectively evaluated for impairment                       1,328,230 1,195,303 1,153,671
Ending balance: loans acquired with deteriorated credit quality                       2,368 2,784 7,320
Receivables Acquired with Deteriorated Credit Quality [Member]                            
Allowance for loan losses:                            
Beginning balance       277         277          
Ending balance 107       277       107 277        
Beginning balance       277         277          
Ending balance: loans acquired with deteriorated credit quality 107     277 277       277 277   107 277  
Loans receivable:                            
Ending balance 107       277       107 277        
Commercial [Member]                            
Allowance for loan losses:                            
Beginning balance       2,321       2,008 2,321 2,008 799      
Charge-offs                 (246) (601) (5)      
Recoveries                 77 9 1      
Provisions                 890 905 1,213      
Ending balance 3,042       2,321       3,042 2,321 2,008      
Beginning balance       2,321       2,008 2,321 2,008 799      
Ending balance: individually evaluated for impairment                       759 1,072 1,500
Charge-offs                 (246) (601) (5)      
Ending balance: collectively evaluated for impairment                       2,283 1,081 508
Recoveries                 77 9 1      
Ending balance: loans acquired with deteriorated credit quality 3,042     2,321 2,321     2,008 2,321 2,008 799 3,042 2,321 2,008
Provisions                 890 905 1,213      
Loans receivable:                            
Ending balance                       365,767 319,590 350,680
Ending balance: individually evaluated for impairment                       1,196 2,595 4,504
Ending balance: collectively evaluated for impairment                       363,620 315,642 343,502
Ending balance: loans acquired with deteriorated credit quality                       951 1,353 2,674
Ending balance                       365,767 319,590 350,680
Ending balance 3,042       2,321       3,042 2,321 2,008      
Ending balance: individually evaluated for impairment                       1,196 2,595 4,504
Ending balance: collectively evaluated for impairment                       363,620 315,642 343,502
Ending balance: loans acquired with deteriorated credit quality                       951 1,353 2,674
Commercial [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                            
Allowance for loan losses:                            
Beginning balance       168         168          
Ending balance         168         168        
Beginning balance       168         168          
Ending balance: loans acquired with deteriorated credit quality       168 168       168 168     168  
Loans receivable:                            
Ending balance         168         168        
Real Estate Commercial [Member]                            
Allowance for loan losses:                            
Beginning balance       3,037       2,394 3,037 2,394 2,304      
Charge-offs                 (325) (500) (15)      
Recoveries                 144 292 20      
Provisions                 1,389 851 85      
Ending balance 4,245       3,037       4,245 3,037 2,394      
Beginning balance       3,037       2,394 3,037 2,394 2,304      
Ending balance: individually evaluated for impairment                       126 805 300
Charge-offs                 (325) (500) (15)      
Ending balance: collectively evaluated for impairment                       4,012 2,125 2,094
Recoveries                 144 292 20      
Ending balance: loans acquired with deteriorated credit quality 4,245     3,037 3,037     2,394 3,037 2,394 2,304 4,245 3,037 2,394
Provisions                 1,389 851 85      
Loans receivable:                            
Ending balance                       567,277 493,481 413,058
Ending balance: individually evaluated for impairment                       4,006 5,084 7,711
Ending balance: collectively evaluated for impairment                       561,903 487,024 401,168
Ending balance: loans acquired with deteriorated credit quality                       1,368 1,373 4,179
Ending balance                       567,277 493,481 413,058
Ending balance 4,245       3,037       4,245 3,037 2,394      
Ending balance: individually evaluated for impairment                       4,006 5,084 7,711
Ending balance: collectively evaluated for impairment                       561,903 487,024 401,168
Ending balance: loans acquired with deteriorated credit quality                       1,368 1,373 4,179
Real Estate Commercial [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                            
Allowance for loan losses:                            
Beginning balance       107         107          
Ending balance 107       107       107 107        
Beginning balance       107         107          
Ending balance: loans acquired with deteriorated credit quality 107     107 107       107 107   107 107  
Loans receivable:                            
Ending balance 107       107       107 107        
Real Estate Residential [Member]                            
Allowance for loan losses:                            
Beginning balance       3,690       3,135 3,690 3,135 2,981      
Charge-offs                 (523) (804) (508)      
Recoveries                 26 38 111      
Provisions                 889 1,321 551      
Ending balance 4,082       3,690       4,082 3,690 3,135      
Beginning balance       3,690       3,135 3,690 3,135 2,981      
Ending balance: individually evaluated for impairment                       1,138 767 224
Charge-offs                 (523) (804) (508)      
Ending balance: collectively evaluated for impairment                       2,944 2,921 2,911
Recoveries                 26 38 111      
Ending balance: loans acquired with deteriorated credit quality 4,082     3,690 3,690     3,135 3,690 3,135 2,981 4,082 3,690 3,135
Provisions                 889 1,321 551      
Loans receivable:                            
Ending balance                       306,218 322,454 322,062
Ending balance: individually evaluated for impairment                       4,917 4,001 3,321
Ending balance: collectively evaluated for impairment                       301,252 318,395 318,274
Ending balance: loans acquired with deteriorated credit quality                       49 58 467
Ending balance                       306,218 322,454 322,062
Ending balance 4,082       3,690       4,082 3,690 3,135      
Ending balance: individually evaluated for impairment                       4,917 4,001 3,321
Ending balance: collectively evaluated for impairment                       301,252 318,395 318,274
Ending balance: loans acquired with deteriorated credit quality                       49 58 467
Real Estate Residential [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                            
Allowance for loan losses:                            
Beginning balance       2         2          
Ending balance         2         2        
Beginning balance       2         2          
Ending balance: loans acquired with deteriorated credit quality       2 2       2 2     2  
Loans receivable:                            
Ending balance         2         2        
Consumer [Member]                            
Allowance for loan losses:                            
Beginning balance       1,290       1,114 1,290 1,114 866      
Charge-offs                 (333) (386) (313)      
Recoveries                 117 115 49      
Provisions                 509 447 512      
Ending balance 1,583       1,290       1,583 1,290 1,114      
Beginning balance       1,290       1,114 1,290 1,114 866      
Ending balance: individually evaluated for impairment                       117 38  
Charge-offs                 (333) (386) (313)      
Ending balance: collectively evaluated for impairment                       1,466 1,252 1,114
Recoveries                 117 115 49      
Ending balance: loans acquired with deteriorated credit quality 1,583     $ 1,290 1,290     $ 1,114 1,290 1,114 866 1,583 1,290 1,114
Provisions                 509 447 512      
Loans receivable:                            
Ending balance                       101,603 74,369 90,817
Ending balance: individually evaluated for impairment                       148 127 90
Ending balance: collectively evaluated for impairment                       101,455 74,242 90,727
Ending balance                       101,603 74,369 90,817
Ending balance 1,583       $ 1,290       1,583 $ 1,290 $ 1,114      
Ending balance: individually evaluated for impairment                       148 127 90
Ending balance: collectively evaluated for impairment                       101,455 $ 74,242 $ 90,727
Unallocated [Member]                            
Allowance for loan losses:                            
Provisions                 23          
Ending balance 23               23          
Ending balance: collectively evaluated for impairment                       23    
Ending balance: loans acquired with deteriorated credit quality 23               23     $ 23    
Provisions                 23          
Loans receivable:                            
Ending balance $ 23               $ 23