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Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 7,623,663 $ 6,205,118
Unearned income (3,341) (2,409)
Loans, net of unearned income 7,620,322 6,202,709
Allowance for loan losses (46,211) (42,737)
Loans, net 7,574,111 6,159,972
Commercial, financial, agricultural    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 1,039,393 717,490
Loans, net of unearned income 1,039,393 717,490
Lease financing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 57,354 49,250
Real estate – construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 633,389 552,679
Loans, net of unearned income 633,389 552,679
Real estate – 1-4 family mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 2,343,721 1,878,177
Loans, net of unearned income 2,343,721 1,878,177
Real estate – commercial mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 3,427,530 2,898,895
Loans, net of unearned income 3,427,530 2,898,895
Installment loans to individuals    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 122,276 108,627
Loans, net of unearned income $ 176,289 $ 155,468