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Loans and Allowance - Composition of Loan Portfolio by Loan Class (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 8,606,849 $ 8,459,310    
Allowance for loan losses (99,454) (80,284) $ (80,902) $ (80,552)
Net Loans 8,507,395 8,379,026    
Commercial and industrial loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 2,199,226 2,109,879    
Agricultural production financing and other loans to farmers        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 87,421 93,861    
Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 643,674 787,568    
Commercial and farmland        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 3,268,168 3,052,698    
Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 1,121,556 1,143,217    
Allowance for loan losses (17,364) (14,569) (14,373) (14,322)
Home equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 570,398 588,984    
Individuals' loans for household and other personal expenditures        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 129,765 135,989    
Allowance for loan losses (5,752) (4,035) $ (4,026) $ (3,964)
Public finance and other commercial loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 586,641 $ 547,114