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Loans and Allowance - Composition of Loan Portfolio by Loan Class (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 7,299,320 $ 7,224,467    
Allowance for loan losses (80,902) (80,552) $ (76,420) $ (75,032)
Net Loans 7,218,418 7,143,915    
Commercial and industrial loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 1,788,628 1,726,664    
Agricultural production financing and other loans to farmers        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 80,357 92,404    
Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 542,501 545,729    
Commercial and farmland        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 2,838,798 2,832,102    
Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 976,668 966,421    
Allowance for loan losses (14,373) (14,322) (14,049) (13,537)
Home equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 536,208 528,157    
Individuals' loans for household and other personal expenditures        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 108,216 99,788    
Allowance for loan losses (4,026) (3,964) $ (3,896) $ (3,732)
Public finance and other commercial loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 427,944 $ 433,202