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Loans, net and allowance for loan losses - Allocation of Allowance for Loan Losses and Related Loans by Major Classification of Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Allowance for loan losses:            
Ending balance $ 14,799 $ 14,158 $ 12,975 $ 11,428 $ 10,803 $ 10,338
Ending balance: individually evaluated for impairment 1,814   2,140      
Ending balance: collectively evaluated for impairment 12,985   10,728      
Loans receivable:            
Ending balance 1,464,808   1,340,865      
Ending balance: individually evaluated for impairment 9,348   10,267      
Ending balance: collectively evaluated for impairment 1,453,033   1,328,230      
Loans Acquired with Deteriorated Credit Quality            
Allowance for loan losses:            
Ending balance     107      
Loans receivable:            
Ending balance 2,427   2,368      
Commercial            
Allowance for loan losses:            
Ending balance 3,263 3,322 3,042 2,435 2,420 2,321
Ending balance: individually evaluated for impairment 615   759      
Ending balance: collectively evaluated for impairment 2,648   2,283      
Loans receivable:            
Ending balance 394,283   365,767      
Ending balance: individually evaluated for impairment 870   1,196      
Ending balance: collectively evaluated for impairment 392,372   363,620      
Commercial | Loans Acquired with Deteriorated Credit Quality            
Loans receivable:            
Ending balance 1,041   951      
Real estate Commercial            
Allowance for loan losses:            
Ending balance 5,077 4,616 4,245 3,190 3,087 3,037
Ending balance: individually evaluated for impairment 405   126      
Ending balance: collectively evaluated for impairment 4,672   4,012      
Loans receivable:            
Ending balance 647,058   567,277      
Ending balance: individually evaluated for impairment 5,073   4,006      
Ending balance: collectively evaluated for impairment 640,642   561,903      
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality            
Allowance for loan losses:            
Ending balance     107      
Loans receivable:            
Ending balance 1,343   1,368      
Real estate Residential            
Loans receivable:            
Ending balance 299,037   306,218      
Consumer            
Allowance for loan losses:            
Ending balance 1,679 1,646 1,583 $ 1,776 $ 1,387 $ 1,290
Ending balance: individually evaluated for impairment 71   117      
Ending balance: collectively evaluated for impairment 1,608   1,466      
Loans receivable:            
Ending balance 124,430   101,603      
Ending balance: individually evaluated for impairment 228   148      
Ending balance: collectively evaluated for impairment 124,202   101,455      
Unallocated            
Allowance for loan losses:            
Ending balance 315 $ 215 23      
Ending balance: collectively evaluated for impairment $ 315   $ 23