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Loans and Allowance for Credit Losses - Types of Loans in Loan Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Accounts Notes And Loans Receivable [Line Items]      
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage $ 29,457 $ 23,933  
Total loans held for investment 9,518,857 9,414,656 $ 9,192,424
Total 9,548,314 9,438,589  
Residential Portfolio Segment [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage 29,457 23,933  
Commercial and Industrial [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Total loans held for investment 1,542,059 1,692,246 1,648,832
Total 1,542,059 1,692,246  
Construction, Land Development and Other Land Loans [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Total loans held for investment 1,205,820 1,073,198 1,072,985
Total 1,205,820 1,073,198  
1-4 Family Residential (Includes Home Equity) [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage 29,500 23,900 12,600
Total loans held for investment 2,677,995 2,616,732 2,584,021
Total [2] 2,707,452 [1] 2,640,665 [3]  
Commercial Real Estate (Includes Multi-Family Residential) [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Total loans held for investment 3,158,569 3,131,083 2,992,726
Total 3,158,569 3,131,083  
Farmland [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Total loans held for investment 473,957 434,349  
Agriculture [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Total loans held for investment 190,123 214,469  
Consumer and Other [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Total loans held for investment 270,334 252,579 $ 275,297
Total $ 270,334 $ 252,579  
[1] (1)Includes $29.5 million of residential mortgage loans held for sale at September 30, 2016.
[2] Includes $29.5 million and $23.9 million of residential mortgage loans held for sale at September 30, 2016 and December 31, 2015, respectively.
[3] (1)Includes $23.9 million of residential mortgage loans held for sale at December 31, 2015.