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Loans - Recorded Investment by Loan Grade (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 5,271,857 | $ 5,068,085 | $ 4,829,682
Five Rated [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 5,826 | 4,392 |
Five Rated [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 7,548 | 14,880 |
Five Rated [Member] | Remaining commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 287 | 2,151 |
Five Rated [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,055 | 3,280 |
Five Rated [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 14,716 | 24,703 |
Six Rated [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans |  | 347 |
Six Rated [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 190 | 3,417 |
Six Rated [Member] | Remaining commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 118 | 122 |
Six Rated [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 124 | 386 |
Six Rated [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 432 | 4,272 |
Impaired [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 20,657 | 30,623 |
Impaired [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 24,474 | 18,025 |
Impaired [Member] | SEPH commercial land and development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans |  | 2,044 |
Impaired [Member] | Remaining commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,226 | 4,676 |
Impaired [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 23,102 | 25,324 |
Impaired [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 70,459 | 80,692 |
Pass [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 971,694 | 923,802 |
Pass [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,127,652 | 1,081,290 |
Pass [Member] | Remaining commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 133,110 | 121,418 |
Pass [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 383,346 | 382,595 |
Pass [Member] | Leases |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,272 | 2,870 |
Pass [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,619,074 | 2,511,975 |
Recorded Investment [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 998,177 | 959,164 |
Recorded Investment [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,159,864 | 1,117,612 |
Recorded Investment [Member] | SEPH commercial land and development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans |  | 2,044 |
Recorded Investment [Member] | Remaining commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 135,741 | 128,367 |
Recorded Investment [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 407,627 | 411,585 |
Recorded Investment [Member] | Leases |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,272 | 2,870 |
Recorded Investment [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 2,704,681 | $ 2,621,642 |

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