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Allowance for Loan Losses - Summary of Total Non Purchased and Purchased Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 9,126,211 $ 7,623,663
Unearned income (3,304) (3,341)
Loans, net of unearned income 9,122,907 7,620,322
Allowance for loan losses (48,610) (46,211)
Loans, net 9,074,297 7,574,111
Commercial, financial, agricultural    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 1,313,344 1,039,393
Loans, net of unearned income 1,313,344 1,039,393
Lease financing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 57,576 57,354
Real estate – construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 736,985 633,389
Loans, net of unearned income 736,985 633,389
Real estate – 1-4 family mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 2,762,683 2,343,721
Loans, net of unearned income 2,762,683 2,343,721
Real estate – commercial mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 4,112,585 3,427,530
Loans, net of unearned income 4,112,585 3,427,530
Installment loans to individuals    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 143,038 122,276
Loans, net of unearned income $ 197,310 $ 176,289