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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for loan losses:        
Ending balance $ 28,383 $ 27,344 $ 22,677 $ 21,379
Ending balance: individually evaluated for impairment 175 1,202 777  
Ending balance: collectively evaluated for impairment 28,208 26,142 21,900  
Loans receivable:        
Ending balance 2,329,173 2,177,982 1,938,240  
Ending balance: individually evaluated for impairment 4,362 9,795 9,859  
Ending balance: collectively evaluated for impairment 2,324,811 2,168,187 1,928,381  
Commercial        
Allowance for loan losses:        
Ending balance 8,453 8,734 6,888 5,516
Ending balance: individually evaluated for impairment 40 947 363  
Ending balance: collectively evaluated for impairment 8,413 7,787 6,525  
Loans receivable:        
Ending balance 613,127 679,286 522,957  
Ending balance: individually evaluated for impairment 199 4,297 4,658  
Ending balance: collectively evaluated for impairment 612,928 674,989 518,299  
Real estate Commercial        
Allowance for loan losses:        
Ending balance 15,928 14,559 11,496 10,736
Ending balance: individually evaluated for impairment 109 180 279  
Ending balance: collectively evaluated for impairment 15,819 14,379 11,217  
Loans receivable:        
Ending balance 1,343,539 1,137,990 1,011,423  
Ending balance: individually evaluated for impairment 2,890 3,952 3,048  
Ending balance: collectively evaluated for impairment 1,340,649 1,134,038 1,008,375  
Real estate Residential        
Allowance for loan losses:        
Ending balance 3,209 3,129 3,226 3,892
Ending balance: individually evaluated for impairment 26 75 135  
Ending balance: collectively evaluated for impairment 3,183 3,054 3,091  
Loans receivable:        
Ending balance 297,624 277,414 301,378  
Ending balance: individually evaluated for impairment 1,273 1,546 2,153  
Ending balance: collectively evaluated for impairment 296,351 275,868 299,225  
Consumer        
Allowance for loan losses:        
Ending balance 793 922 1,067 $ 1,235
Ending balance: collectively evaluated for impairment 793 922 1,067  
Loans receivable:        
Ending balance 74,883 83,292 102,482  
Ending balance: collectively evaluated for impairment $ 74,883 $ 83,292 $ 102,482