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Loans and Allowance - Composition of Loan Portfolio by Loan Class (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]            
  Loans $ 9,243,833   $ 8,459,310      
Allowance for loan losses (126,726) $ (121,119) (80,284) $ (80,571) $ (81,274) $ (80,552)
Net Loans 9,117,107   8,379,026      
Commercial and industrial loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
  Loans 2,875,331   2,109,879      
Agricultural production financing and other loans to farmers            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
  Loans 83,090   93,861      
Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
  Loans 622,084   787,568      
Commercial and farmland            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
  Loans 3,248,506   3,052,698      
Residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
  Loans 1,146,406   1,143,217      
Allowance for loan losses (22,047) (21,078) (14,569) (14,498) (14,471) (14,322)
Home equity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
  Loans 527,458   588,984      
Individuals' loans for household and other personal expenditures            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
  Loans 125,411   135,989      
Allowance for loan losses (9,378) $ (8,445) (4,035) $ (4,106) $ (4,070) $ (3,964)
Public finance and other commercial loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
  Loans $ 615,547   $ 547,114