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Loans and Allowance for Loan Losses - Loan Portfolio by Categories (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]    
Loans $ 11,860,000 $ 10,780,000
Loans acquired, net of discount and allowance 3,734,921 5,074,076
Total loans 11,858,195 10,779,685
Loans, Excluding Acquired Loans    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 8,123,274 5,705,609
Consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 441,718 465,516
Consumer | Credit cards    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 182,137 185,422
Consumer | Other consumer    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 259,581 280,094
Real estate    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 5,709,067 4,239,612
Real estate | Construction    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 1,229,888 614,155
Real estate | Single family residential    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 1,401,991 1,094,633
Real estate | Other commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 3,077,188 2,530,824
Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 1,827,120 973,519
Commercial | Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 1,608,342 825,217
Commercial | Agricultural    
Loans and Leases Receivable Disclosure [Line Items]    
Loans 218,778 148,302
Other    
Loans and Leases Receivable Disclosure [Line Items]    
Loans $ 145,369 $ 26,962