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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, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Allowance for loan losses:            
Ending balance $ 21,930 $ 22,105 $ 21,379 $ 19,573 $ 19,718 $ 18,960
Ending balance: individually evaluated for impairment 1,126   1,179      
Ending balance: collectively evaluated for impairment 20,804   20,200      
Loans receivable:            
Ending balance 1,858,799   1,823,266      
Ending balance: individually evaluated for impairment 12,313   9,641      
Ending balance: collectively evaluated for impairment 1,846,486   1,813,625      
Commercial            
Allowance for loan losses:            
Ending balance 6,142 5,955 5,516 5,191 5,198 5,513
Ending balance: individually evaluated for impairment 615   50      
Ending balance: collectively evaluated for impairment 5,527   5,466      
Loans receivable:            
Ending balance 513,655   494,134      
Ending balance: individually evaluated for impairment 5,915   2,237      
Ending balance: collectively evaluated for impairment 507,740   491,897      
Real estate Commercial            
Allowance for loan losses:            
Ending balance 11,042 11,074 10,736 10,058 10,301 8,944
Ending balance: individually evaluated for impairment 216   403      
Ending balance: collectively evaluated for impairment 10,826   10,333      
Loans receivable:            
Ending balance 935,578   907,803      
Ending balance: individually evaluated for impairment 3,867   3,121      
Ending balance: collectively evaluated for impairment 931,711   904,682      
Real estate Residential            
Allowance for loan losses:            
Ending balance 3,615 3,880 3,892 3,156 2,924  
Ending balance: individually evaluated for impairment 295   666      
Ending balance: collectively evaluated for impairment 3,320   3,226      
Loans receivable:            
Ending balance 298,527   299,876      
Ending balance: individually evaluated for impairment 2,280   4,071      
Ending balance: collectively evaluated for impairment 296,247   295,805      
Consumer            
Allowance for loan losses:            
Ending balance 1,131 $ 1,196 1,235 $ 1,168 $ 1,295 $ 1,392
Ending balance: individually evaluated for impairment     60      
Ending balance: collectively evaluated for impairment 1,131   1,175      
Loans receivable:            
Ending balance 111,039   121,453      
Ending balance: individually evaluated for impairment 251   212      
Ending balance: collectively evaluated for impairment $ 110,788   $ 121,241