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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable    
Loans $ 2,023,155 $ 1,938,240
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 537,949 522,957
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 1,082,124 1,011,423
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans 307,215 301,378
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans $ 95,867 $ 102,482