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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
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for loan losses:        
Ending balance $ 21,379 $ 18,960 $ 15,961 $ 12,975
Ending balance: individually evaluated for impairment 1,179 766 1,942  
Ending balance: collectively evaluated for impairment 20,200 18,194 14,019  
Loans receivable:        
Ending balance 1,823,266 1,693,065 1,532,965  
Ending balance: individually evaluated for impairment 9,641 10,722 13,579  
Ending balance: collectively evaluated for impairment 1,813,625 1,682,343 1,519,386  
Commercial        
Allowance for loan losses:        
Ending balance 5,516 5,513 4,452 4,113
Ending balance: individually evaluated for impairment 50 159 225  
Ending balance: collectively evaluated for impairment 5,466 5,354 4,227  
Loans receivable:        
Ending balance 494,134 476,199 408,814  
Ending balance: individually evaluated for impairment 2,237 2,463 2,687  
Ending balance: collectively evaluated for impairment 491,897 473,736 406,127  
Real estate Commercial        
Allowance for loan losses:        
Ending balance 10,736 8,944 7,548 4,751
Ending balance: individually evaluated for impairment 403 263 1,197  
Ending balance: collectively evaluated for impairment 10,333 8,681 6,351  
Loans receivable:        
Ending balance 907,803 786,210 700,144  
Ending balance: individually evaluated for impairment 3,121 4,289 7,157  
Ending balance: collectively evaluated for impairment 904,682 781,921 692,987  
Consumer        
Allowance for loan losses:        
Ending balance 1,235 1,392 1,000 $ 937
Ending balance: individually evaluated for impairment 60 8    
Ending balance: collectively evaluated for impairment 1,175 1,384 1,000  
Loans receivable:        
Ending balance 121,453 142,721 134,226  
Ending balance: individually evaluated for impairment 212 177 155  
Ending balance: collectively evaluated for impairment $ 121,241 $ 142,544 $ 134,071