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Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 6,205,118 $ 5,414,625
Unearned income (2,409) (1,163)
Loans, net of unearned income 6,202,709 5,413,462
Allowance for loan losses (42,737) (42,437)
Loans, net 6,159,972 5,371,025
Commercial, financial, agricultural    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 717,490 636,837
Loans, net of unearned income 717,490 636,837
Lease financing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 49,250 35,978
Real estate – construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 552,679 357,665
Loans, net of unearned income 552,679 357,665
Real estate – 1-4 family mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 1,878,177 1,735,323
Loans, net of unearned income 1,878,177 1,735,323
Real estate – commercial mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 2,898,895 2,533,729
Loans, net of unearned income 2,898,895 2,533,729
Installment loans to individuals    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 108,627 115,093
Loans, net of unearned income $ 155,468 $ 149,908