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Loans, net and allowance for credit losses - Major Classifications of Loans Outstanding (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable    
Loans   $ 2,730,116
Loans $ 2,843,238  
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans   433,048
Loans 437,012  
Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable    
Loans   433,048
Loans 437,012  
Municipal    
Accounts, Notes, Loans and Financing Receivable    
Loans   166,210
Loans 172,875  
Commercial, Industrial and Municipal    
Accounts, Notes, Loans and Financing Receivable    
Loans   599,258
Loans 609,887  
Real estate    
Accounts, Notes, Loans and Financing Receivable    
Loans   2,040,555
Loans 2,143,266  
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Loans   1,709,827
Loans 1,794,355  
Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Loans   330,728
Loans 348,911  
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans   90,303
Loans 90,085  
Indirect Auto    
Accounts, Notes, Loans and Financing Receivable    
Loans   76,461
Loans 83,348  
Consumer Other    
Accounts, Notes, Loans and Financing Receivable    
Loans   $ 13,842
Loans $ 6,737