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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable      
Loans $ 2,329,173 $ 2,177,982 $ 1,938,240
Commercial      
Accounts, Notes, Loans and Financing Receivable      
Loans 613,127 679,286 522,957
Real estate Commercial      
Accounts, Notes, Loans and Financing Receivable      
Loans 1,343,539 1,137,990 1,011,423
Real estate Residential      
Accounts, Notes, Loans and Financing Receivable      
Loans 297,624 277,414 301,378
Consumer      
Accounts, Notes, Loans and Financing Receivable      
Loans $ 74,883 $ 83,292 $ 102,482