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Loans - Composition of Loan Portfolio By Class of Loan (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance $ 66,585 $ 95,358  
Impaired Financing Receivable, Recorded Investment 56,564 70,426 $ 80,664
Impaired Financing Receivable, Related Allowance 684 548  
Loan Balance 5,372,483 5,271,857  
Accrued Interest Receivable 16,659 14,973  
Recorded Investment 5,389,142 5,286,830  
Commercial, financial and agricultural      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 18,039 20,624 30,595
Loan Balance [1] 1,053,453 994,619  
Accrued Interest Receivable [1] 4,413 3,558  
Recorded Investment [1] 1,057,866 998,177  
Commercial real estate      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 18,142 24,474 18,025
Loan Balance [1] 1,167,607 1,155,703  
Accrued Interest Receivable [1] 4,283 4,161  
Recorded Investment [1] 1,171,890 1,159,864  
Construction real estate      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 181,470 188,945  
Recorded Investment 182,017 189,466  
Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 1,324 2,226 6,720
Loan Balance 125,389 135,343  
Accrued Interest Receivable 401 398  
Recorded Investment 125,790 135,741  
Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 52,203 48,699  
Accrued Interest Receivable 133 106  
Recorded Investment 52,336 48,805  
Installment      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 3,878 4,903  
Accrued Interest Receivable 13 17  
Recorded Investment 3,891 4,920  
Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Recorded Investment 19,059 23,102 $ 25,324
Loan Balance 393,094 406,687  
Accrued Interest Receivable 1,029 940  
Recorded Investment 394,123 407,627  
Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 1,110,426 1,169,495  
Accrued Interest Receivable 1,516 1,459  
Recorded Investment 1,111,942 1,170,954  
HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 203,178 212,441  
Accrued Interest Receivable 974 853  
Recorded Investment 204,152 213,294  
Installment      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 18,526 19,874  
Accrued Interest Receivable 53 67  
Recorded Investment 18,579 19,941  
Consumer      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 1,241,736 1,120,850  
Accrued Interest Receivable 3,808 3,385  
Recorded Investment 1,245,544 1,124,235  
Leases      
Financing Receivable, Recorded Investment [Line Items]      
Loan Balance 2,993 3,243  
Accrued Interest Receivable 36 29  
Recorded Investment 3,029 3,272  
Financing Receivable With No Related Allowance Recorded [Member] | Commercial, financial and agricultural      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 19,899 41,075  
Impaired Financing Receivable, Recorded Investment 14,704 19,965  
Financing Receivable With No Related Allowance Recorded [Member] | Commercial real estate      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 18,974 23,961  
Impaired Financing Receivable, Recorded Investment 18,060 23,474  
Financing Receivable With No Related Allowance Recorded [Member] | Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 2,788 3,662  
Impaired Financing Receivable, Recorded Investment 1,324 2,226  
Financing Receivable With No Related Allowance Recorded [Member] | Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 19,346 24,409  
Impaired Financing Receivable, Recorded Investment 19,012 22,687  
Financing Receivable With Related Allowance Recorded [Member] | Commercial, financial and agricultural      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 5,394 810  
Impaired Financing Receivable, Recorded Investment 3,335 659  
Impaired Financing Receivable, Related Allowance 681 152  
Financing Receivable With Related Allowance Recorded [Member] | Commercial real estate      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 137 1,014  
Impaired Financing Receivable, Recorded Investment 82 1,000  
Impaired Financing Receivable, Related Allowance 2 309  
Financing Receivable With Related Allowance Recorded [Member] | Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 47 427  
Impaired Financing Receivable, Recorded Investment 47 415  
Impaired Financing Receivable, Related Allowance $ 1 $ 87  
[1] Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.