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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
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Allowance for loan losses:            
Ending balance $ 22,392 $ 21,930 $ 21,379 $ 20,413 $ 19,573 $ 18,960
Ending balance: individually evaluated for impairment 815   1,179      
Ending balance: collectively evaluated for impairment 21,577   20,200      
Loans receivable:            
Ending balance 1,881,090   1,823,266      
Ending balance: individually evaluated for impairment 11,087   9,641      
Ending balance: collectively evaluated for impairment 1,870,003   1,813,625      
Commercial            
Allowance for loan losses:            
Ending balance 5,923 6,142 5,516 5,469 5,191 5,513
Ending balance: individually evaluated for impairment 394   50      
Ending balance: collectively evaluated for impairment 5,529   5,466      
Loans receivable:            
Ending balance 497,985   494,134      
Ending balance: individually evaluated for impairment 4,772   2,237      
Ending balance: collectively evaluated for impairment 493,213   491,897      
Real estate Commercial            
Allowance for loan losses:            
Ending balance 11,770 11,042 10,736 10,442 10,058 8,944
Ending balance: individually evaluated for impairment 225   403      
Ending balance: collectively evaluated for impairment 11,545   10,333      
Loans receivable:            
Ending balance 976,258   907,803      
Ending balance: individually evaluated for impairment 3,603   3,121      
Ending balance: collectively evaluated for impairment 972,655   904,682      
Real estate Residential            
Allowance for loan losses:            
Ending balance 3,556 3,615 3,892 3,322 3,156  
Ending balance: individually evaluated for impairment 196   666      
Ending balance: collectively evaluated for impairment 3,360   3,226      
Loans receivable:            
Ending balance 299,209   299,876      
Ending balance: individually evaluated for impairment 2,450   4,071      
Ending balance: collectively evaluated for impairment 296,759   295,805      
Consumer            
Allowance for loan losses:            
Ending balance 1,143 $ 1,131 1,235 $ 1,180 $ 1,168 $ 1,392
Ending balance: individually evaluated for impairment     60      
Ending balance: collectively evaluated for impairment 1,143   1,175      
Loans receivable:            
Ending balance 107,638   121,453      
Ending balance: individually evaluated for impairment 262   212      
Ending balance: collectively evaluated for impairment $ 107,376   $ 121,241