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Loans - Composition of Loan Portfolio By Class of Loan (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | $ 95,358 | $ 109,305 |
Impaired Financing Receivable, Recorded Investment |  | 70,426 | 80,664 | $ 73,712
Impaired Financing Receivable, Related Allowance |  | 548 | 4,191 |
Loan Balance |  | 5,271,857 | 5,068,085 |
Accrued Interest Receivable |  | 14,973 | 14,239 |
Recorded Investment |  | 5,286,830 | 5,082,324 |
Commercial, financial and agricultural |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 20,624 | 30,595 | 19,106
Loan Balance | [1] | 994,619 | 955,727 |
Accrued Interest Receivable | [1] | 3,558 | 3,437 |
Recorded Investment | [1] | 998,177 | 959,164 |
Commercial real estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 24,474 | 18,025 | 21,989
Loan Balance | [1] | 1,155,703 | 1,113,603 |
Accrued Interest Receivable | [1] | 4,161 | 4,009 |
Recorded Investment | [1] | 1,159,864 | 1,117,612 |
Construction real estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 188,945 | 173,345 |
Recorded Investment |  | 189,466 | 173,762 |
SEPH commercial land and development |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance | [1] | 0 | 2,044 |
Accrued Interest Receivable | [1] | 0 | 0 |
Recorded Investment | [1] | 0 | 2,044 |
Remaining commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 2,226 | 4,676 | 5,609
Loan Balance |  | 135,343 | 128,046 |
Accrued Interest Receivable |  | 398 | 321 |
Recorded Investment |  | 135,741 | 128,367 |
Mortgage |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 48,699 | 36,722 |
Accrued Interest Receivable |  | 106 | 75 |
Recorded Investment |  | 48,805 | 36,797 |
Installment |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 4,903 | 6,533 |
Accrued Interest Receivable |  | 17 | 21 |
Recorded Investment |  | 4,920 | 6,554 |
Commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 23,102 | 25,324 | $ 24,930
Loan Balance |  | 406,687 | 410,571 |
Accrued Interest Receivable |  | 940 | 1,014 |
Recorded Investment |  | 407,627 | 411,585 |
Mortgage |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 1,169,495 | 1,210,819 |
Accrued Interest Receivable |  | 1,459 | 1,469 |
Recorded Investment |  | 1,170,954 | 1,212,288 |
HELOC |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 212,441 | 211,415 |
Accrued Interest Receivable |  | 853 | 769 |
Recorded Investment |  | 213,294 | 212,184 |
Installment |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 19,874 | 22,638 |
Accrued Interest Receivable |  | 67 | 78 |
Recorded Investment |  | 19,941 | 22,716 |
Consumer |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 1,120,850 | 967,111 |
Accrued Interest Receivable |  | 3,385 | 3,032 |
Recorded Investment |  | 1,124,235 | 970,143 |
Leases |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 3,243 | 2,856 |
Accrued Interest Receivable |  | 29 | 14 |
Recorded Investment |  | 3,272 | 2,870 |
Financing Receivable With No Related Allowance Recorded [Member] | Commercial, financial and agricultural |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 41,075 | 32,583 |
Impaired Financing Receivable, Recorded Investment |  | 19,965 | 18,763 |
Financing Receivable With No Related Allowance Recorded [Member] | Commercial real estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 23,961 | 15,138 |
Impaired Financing Receivable, Recorded Investment |  | 23,474 | 14,916 |
Financing Receivable With No Related Allowance Recorded [Member] | SEPH commercial land and development |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  |  | 10,834 |
Impaired Financing Receivable, Recorded Investment |  |  | 2,044 |
Financing Receivable With No Related Allowance Recorded [Member] | Remaining commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 3,662 | 2,506 |
Impaired Financing Receivable, Recorded Investment |  | 2,226 | 1,531 |
Financing Receivable With No Related Allowance Recorded [Member] | Commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 24,409 | 23,798 |
Impaired Financing Receivable, Recorded Investment |  | 22,687 | 23,480 |
Financing Receivable With Related Allowance Recorded [Member] | Commercial, financial and agricultural |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 810 | 16,155 |
Impaired Financing Receivable, Recorded Investment |  | 659 | 11,832 |
Impaired Financing Receivable, Related Allowance |  | 152 | 1,904 |
Financing Receivable With Related Allowance Recorded [Member] | Commercial real estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 1,014 | 3,195 |
Impaired Financing Receivable, Recorded Investment |  | 1,000 | 3,109 |
Impaired Financing Receivable, Related Allowance |  | 309 | 381 |
Financing Receivable With Related Allowance Recorded [Member] | Remaining commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  |  | 3,145 |
Impaired Financing Receivable, Recorded Investment |  |  | 3,145 |
Impaired Financing Receivable, Related Allowance |  |  | 1,356 |
Financing Receivable With Related Allowance Recorded [Member] | Commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 427 | 1,951 |
Impaired Financing Receivable, Recorded Investment |  | 415 | 1,844 |
Impaired Financing Receivable, Related Allowance |  | $ 87 | $ 550 |
[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.

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