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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable    
Loans $ 2,205,661 $ 2,177,982
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 588,466 679,286
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 1,248,693 1,137,990
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans 291,404 277,414
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans $ 77,098 $ 83,292