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Loans and Allowance - Composition of Loan Portfolio by Loan Class (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 8,459,310 $ 7,224,467    
Allowance for loan losses (80,284) (80,552) $ (75,032) $ (66,037)
Net Loans 8,379,026 7,143,915    
Commercial and industrial loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 2,109,879 1,726,664    
Agricultural production financing and other loans to farmers        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 93,861 92,404    
Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 787,568 545,729    
Commercial and farmland        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 3,052,698 2,832,102    
Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 1,143,217 966,421    
Allowance for loan losses (14,569) (14,322) (13,537) (11,755)
Home equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 588,984 528,157    
Individuals' loans for household and other personal expenditures        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 135,989 99,788    
Allowance for loan losses (4,035) (3,964) $ (3,732) $ (2,923)
Public finance and other commercial loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 547,114 $ 433,202