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Loans and Allowance - Composition of Loan Portfolio by Loan Class (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans $ 7,511,370   $ 7,224,467      
Allowance for loan losses (81,274) $ (80,902) (80,552) $ (77,543) $ (76,420) $ (75,032)
Net Loans 7,430,096   7,143,915      
Commercial and industrial loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 1,877,042   1,726,664      
Agricultural production financing and other loans to farmers            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 83,452   92,404      
Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 624,548   545,729      
Commercial and farmland            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 2,821,689   2,832,102      
Residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 993,802   966,421      
Allowance for loan losses (14,471) (14,373) (14,322) (14,424) (14,049) (13,537)
Home equity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 548,006   528,157      
Individuals' loans for household and other personal expenditures            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 98,384   99,788      
Allowance for loan losses (4,070) $ (4,026) (3,964) $ (3,921) $ (3,896) $ (3,732)
Public finance and other commercial loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans $ 464,447   $ 433,202