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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable    
Loans $ 2,397,681 $ 2,329,173
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 580,758 613,127
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans 1,436,196 1,343,539
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans 306,068 297,624
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans $ 74,659 $ 74,883