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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
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Allowance for loan losses:        
Ending balance $ 14,158 $ 12,975 $ 10,803 $ 10,338
Ending balance: individually evaluated for impairment 2,096 2,140    
Ending balance: collectively evaluated for impairment 11,955 10,728    
Loans receivable:        
Ending balance 1,409,691 1,340,865    
Ending balance: individually evaluated for impairment 9,566 10,267    
Ending balance: collectively evaluated for impairment 1,397,801 1,328,230    
Loans Acquired with Deteriorated Credit Quality        
Allowance for loan losses:        
Ending balance 107 107    
Loans receivable:        
Ending balance 2,324 2,368    
Commercial        
Allowance for loan losses:        
Ending balance 3,322 3,042 2,420 2,321
Ending balance: individually evaluated for impairment 1,040 759    
Ending balance: collectively evaluated for impairment 2,282 2,283    
Loans receivable:        
Ending balance 395,407 365,767    
Ending balance: individually evaluated for impairment 1,399 1,196    
Ending balance: collectively evaluated for impairment 393,093 363,620    
Commercial | Loans Acquired with Deteriorated Credit Quality        
Loans receivable:        
Ending balance 915 951    
Real estate Commercial        
Allowance for loan losses:        
Ending balance 4,616 4,245 3,087 3,037
Ending balance: individually evaluated for impairment 434 126    
Ending balance: collectively evaluated for impairment 4,075 4,012    
Loans receivable:        
Ending balance 598,875 567,277    
Ending balance: individually evaluated for impairment 4,827 4,006    
Ending balance: collectively evaluated for impairment 592,685 561,903    
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality        
Allowance for loan losses:        
Ending balance 107 107    
Loans receivable:        
Ending balance 1,363 1,368    
Real estate Residential        
Loans receivable:        
Ending balance 301,686 306,218    
Consumer        
Allowance for loan losses:        
Ending balance 1,646 1,583 $ 1,387 $ 1,290
Ending balance: individually evaluated for impairment 89 117    
Ending balance: collectively evaluated for impairment 1,557 1,466    
Loans receivable:        
Ending balance 113,723 101,603    
Ending balance: individually evaluated for impairment 178 148    
Ending balance: collectively evaluated for impairment 113,545 101,455    
Unallocated        
Allowance for loan losses:        
Ending balance 215 23    
Ending balance: collectively evaluated for impairment $ 215 $ 23