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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for loan losses:        
Ending balance $ 22,677 $ 21,379 $ 18,960 $ 15,961
Ending balance: individually evaluated for impairment 777 1,179 766  
Ending balance: collectively evaluated for impairment 21,900 20,200 18,194  
Loans receivable:        
Ending balance 1,938,240 1,823,266 1,693,065  
Ending balance: individually evaluated for impairment 10,120 9,641 10,722  
Ending balance: collectively evaluated for impairment 1,928,120 1,813,625 1,682,343  
Commercial        
Allowance for loan losses:        
Ending balance 6,888 5,516 5,513 4,452
Ending balance: individually evaluated for impairment 363 50 159  
Ending balance: collectively evaluated for impairment 6,525 5,466 5,354  
Loans receivable:        
Ending balance 522,957 494,134 476,199  
Ending balance: individually evaluated for impairment 4,658 2,237 2,463  
Ending balance: collectively evaluated for impairment 518,299 491,897 473,736  
Real estate Commercial        
Allowance for loan losses:        
Ending balance 11,496 10,736 8,944 7,548
Ending balance: individually evaluated for impairment 279 403 263  
Ending balance: collectively evaluated for impairment 11,217 10,333 8,681  
Loans receivable:        
Ending balance 1,011,423 907,803 786,210  
Ending balance: individually evaluated for impairment 3,048 3,121 4,289  
Ending balance: collectively evaluated for impairment 1,008,375 904,682 781,921  
Consumer        
Allowance for loan losses:        
Ending balance 1,067 1,235 1,392 $ 1,000
Ending balance: individually evaluated for impairment   60 8  
Ending balance: collectively evaluated for impairment 1,067 1,175 1,384  
Loans receivable:        
Ending balance 102,482 121,453 142,721  
Ending balance: individually evaluated for impairment 261 212 177  
Ending balance: collectively evaluated for impairment $ 102,221 $ 121,241 $ 142,544