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Allowance for Loan Losses - Summary of Total Non Purchased and Purchased Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 7,451,394 $ 6,205,118
Unearned income (2,786) (2,409)
Loans, net of unearned income 7,448,608 6,202,709
Allowance for loan losses (44,531) (42,737)
Loans, net 7,404,077 6,159,972
Commercial, financial, agricultural    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 1,008,935 717,490
Loans, net of unearned income 1,008,935 717,490
Lease financing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 54,688 49,250
Real estate – construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 577,720 552,679
Loans, net of unearned income 577,720 552,679
Real estate – 1-4 family mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 2,295,852 1,878,177
Loans, net of unearned income 2,295,852 1,878,177
Real estate – commercial mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 3,390,389 2,898,895
Loans, net of unearned income 3,390,389 2,898,895
Installment loans to individuals    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 123,810 108,627
Loans, net of unearned income $ 175,712 $ 155,468