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Loans - Aging of Recorded Investment in Past Due Loans(Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | $ 26,591 |  | $ 24,505 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 24,050 | [1] | 42,383 | [2]
Total past due |  | 50,641 |  | 66,888 |
Total current (2) |  | 5,236,189 |  | 5,015,436 |
Recorded Investment |  | 5,286,830 |  | 5,082,324 |
Commercial, financial and agricultural |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 371 |  | 670 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 4,113 | [1] | 7,536 | [2]
Total past due |  | 4,484 |  | 8,206 |
Total current (2) |  | 993,693 |  | 950,958 |
Recorded Investment | [3] | 998,177 |  | 959,164 |
Commercial real estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 355 |  | 142 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 2,499 | [1] | 530 | [2]
Total past due |  | 2,854 |  | 672 |
Total current (2) |  | 1,157,010 |  | 1,116,940 |
Recorded Investment | [3] | 1,159,864 |  | 1,117,612 |
Construction real estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Recorded Investment |  | 189,466 |  | 173,762 |
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] |  |  | 2,044 |
Total past due |  |  |  | 2,044 |
Recorded Investment |  |  |  | 2,044 |
Remaining commercial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  |  |  | 165 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 541 | [1] | 84 | [2]
Total past due |  | 541 |  | 249 |
Total current (2) |  | 135,200 |  | 128,118 |
Recorded Investment |  | 135,741 |  | 128,367 |
Mortgage |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 559 |  | 63 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) | [2] |  |  | 7 |
Total past due |  | 559 |  | 70 |
Total current (2) |  | 48,246 |  | 36,727 |
Recorded Investment |  | 48,805 |  | 36,797 |
Installment |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 223 |  | 200 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 64 | [1] | 46 | [2]
Total past due |  | 287 |  | 246 |
Total current (2) |  | 4,633 |  | 6,308 |
Recorded Investment |  | 4,920 |  | 6,554 |
Commercial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 330 |  | 325 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 3,631 | [1] | 19,521 | [2]
Total past due |  | 3,961 |  | 19,846 |
Total current (2) |  | 403,666 |  | 391,739 |
Recorded Investment |  | 407,627 |  | 411,585 |
Mortgage |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 10,854 |  | 10,569 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 9,769 | [1] | 8,735 | [2]
Total past due |  | 20,623 |  | 19,304 |
Total current (2) |  | 1,150,331 |  | 1,192,984 |
Recorded Investment |  | 1,170,954 |  | 1,212,288 |
HELOC |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 970 |  | 487 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 1,020 | [1] | 186 | [2]
Total past due |  | 1,990 |  | 673 |
Total current (2) |  | 211,304 |  | 211,511 |
Recorded Investment |  | 213,294 |  | 212,184 |
Installment |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 350 |  | 426 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 319 | [1] | 318 | [2]
Total past due |  | 669 |  | 744 |
Total current (2) |  | 19,272 |  | 21,972 |
Recorded Investment |  | 19,941 |  | 22,716 |
Consumer |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 12,579 |  | 11,458 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 2,094 | [1] | 3,376 | [2]
Total past due |  | 14,673 |  | 14,834 |
Total current (2) |  | 1,109,562 |  | 955,309 |
Recorded Investment |  | 1,124,235 |  | 970,143 |
Leases |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total current (2) |  | 3,272 |  | 2,870 |
Recorded Investment |  | $ 3,272 |  | $ 2,870 |
[1] | (1) Includes an aggregate of $2.1 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.(2) Includes an aggregate of $65.9 million of nonaccrual loans which are current in regards to contractual principal and interest payments.
[2] | (1) Includes an aggregate of $2.0 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.(2) Includes an aggregate of $55.5 million of nonaccrual loans which are current in regards to contractual principal and interest payments.
[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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