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Loans - Loans Individually and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | $ 120,975 | $ 116,725
Loans individually evaluated for impairment | 80,664 | 73,712
Loans collectively evaluated for impairment | 40,311 | 43,013
Commercial, financial and agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 30,623 | 19,123
Loans individually evaluated for impairment | 30,595 | 19,106
Loans collectively evaluated for impairment | 28 | 17
Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 18,025 | 21,989
Loans individually evaluated for impairment | 18,025 | 21,989
Loans collectively evaluated for impairment | 0 | 0
SEPH commercial land and development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 2,044 | 2,078
Loans individually evaluated for impairment | 2,044 | 2,078
Loans collectively evaluated for impairment | 0 | 0
Remaining commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 4,676 | 5,609
Loans individually evaluated for impairment | 4,676 | 5,609
Loans collectively evaluated for impairment | 0 | 0
Mortgage |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 117 | 153
Loans individually evaluated for impairment | 0 | 0
Loans collectively evaluated for impairment | 117 | 153
Installment |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 178 | 240
Loans individually evaluated for impairment | 0 | 0
Loans collectively evaluated for impairment | 178 | 240
Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 25,324 | 24,930
Loans individually evaluated for impairment | 25,324 | 24,930
Loans collectively evaluated for impairment | 0 | 0
Mortgage |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 30,521 | 32,218
Loans individually evaluated for impairment | 0 | 0
Loans collectively evaluated for impairment | 30,521 | 32,218
HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 2,622 | 2,509
Loans individually evaluated for impairment | 0 | 0
Loans collectively evaluated for impairment | 2,622 | 2,509
Installment |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 2,292 | 2,522
Loans individually evaluated for impairment | 0 | 0
Loans collectively evaluated for impairment | 2,292 | 2,522
Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 4,553 | 5,354
Loans individually evaluated for impairment | 0 | 0
Loans collectively evaluated for impairment | $ 4,553 | $ 5,354

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