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Loans - Aging of Recorded Investment in Past Due Loans(Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | $ 24,505 |  | $ 31,074 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 42,383 | [1] | 52,932 | [2]
Total past due |  | 66,888 |  | 84,006 |
Total current |  | 5,015,436 |  | 4,759,305 |
Recorded Investment |  | 5,082,324 |  | 4,843,311 |
Commercial, financial and agricultural |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 670 |  | 6,482 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 7,536 | [1] | 7,508 | [2]
Total past due |  | 8,206 |  | 13,990 |
Total current |  | 950,958 |  | 845,763 |
Recorded Investment | [3] | 959,164 |  | 859,753 |
Commercial real estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 142 |  | 808 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 530 | [1] | 8,288 | [2]
Total past due |  | 672 |  | 9,096 |
Total current |  | 1,116,940 |  | 1,064,087 |
Recorded Investment | [3] | 1,117,612 |  | 1,073,183 |
Construction real estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Recorded Investment |  | 173,762 |  | 156,199 |
SEPH commercial land and development |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past due nonaccrual loans and loans past due 90 days or more and accruing | [1] | 2,044 |  |  |
Total past due |  | 2,044 |  |  |
Recorded Investment |  | 2,044 |  |  |
SEPH commercial land and development |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past due nonaccrual loans and loans past due 90 days or more and accruing | [2] |  |  | 2,068 |
Total past due |  |  |  | 2,068 |
Total current |  |  |  | 127 |
Recorded Investment |  |  |  | 2,195 |
Remaining commercial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 165 |  | 166 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 84 | [1] | 77 | [2]
Total past due |  | 249 |  | 243 |
Total current |  | 128,118 |  | 115,196 |
Recorded Investment |  | 128,367 |  | 115,439 |
Mortgage |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 63 |  | 39 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 7 | [1] | 68 | [2]
Total past due |  | 70 |  | 107 |
Total current |  | 36,727 |  | 31,113 |
Recorded Investment |  | 36,797 |  | 31,220 |
Installment |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 200 |  | 21 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 46 | [1] | 25 | [2]
Total past due |  | 246 |  | 46 |
Total current |  | 6,308 |  | 7,299 |
Recorded Investment |  | 6,554 |  | 7,345 |
Commercial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 325 |  | 250 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 19,521 | [1] | 19,592 | [2]
Total past due |  | 19,846 |  | 19,842 |
Total current |  | 391,739 |  | 398,808 |
Recorded Investment |  | 411,585 |  | 418,650 |
Mortgage |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 10,569 |  | 11,146 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 8,735 | [1] | 10,637 | [2]
Total past due |  | 19,304 |  | 21,783 |
Total current |  | 1,192,984 |  | 1,169,474 |
Recorded Investment |  | 1,212,288 |  | 1,191,257 |
HELOC |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 487 |  | 262 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 186 | [1] | 387 | [2]
Total past due |  | 673 |  | 649 |
Total current |  | 211,511 |  | 217,069 |
Recorded Investment |  | 212,184 |  | 217,718 |
Installment |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 426 |  | 596 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 318 | [1] | 464 | [2]
Total past due |  | 744 |  | 1,060 |
Total current |  | 21,972 |  | 26,176 |
Recorded Investment |  | 22,716 |  | 27,236 |
Consumer |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 11,458 |  | 11,304 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 3,376 | [1] | 3,818 | [2]
Total past due |  | 14,834 |  | 15,122 |
Total current |  | 955,309 |  | 881,005 |
Recorded Investment |  | 970,143 |  | 896,127 |
Leases |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total current |  | 2,870 |  | 3,188 |
Recorded Investment |  | $ 2,870 |  | $ 3,188 |
[1] | Includes $2.0 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.
[2] | Includes $2.7 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.
[3] | 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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