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Loans - Loans Individually and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | $ 106,050 | $ 120,975
Loans individually evaluated for impairment | 70,426 | 80,664
Loans collectively evaluated for impairment | 35,624 | 40,311
Commercial, financial and agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 20,657 | 30,623
Loans individually evaluated for impairment | 20,624 | 30,595
Loans collectively evaluated for impairment | 33 | 28
Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 24,474 | 18,025
Loans individually evaluated for impairment | 24,474 | 18,025
Loans collectively evaluated for impairment | 0 | 0
SEPH commercial land and development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 0 | 2,044
Loans individually evaluated for impairment | 0 | 2,044
Loans collectively evaluated for impairment | 0 | 0
Remaining commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 2,226 | 4,676
Loans individually evaluated for impairment | 2,226 | 4,676
Loans collectively evaluated for impairment | 0 | 0
Mortgage |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 104 | 117
Loans individually evaluated for impairment | 0 | 0
Loans collectively evaluated for impairment | 104 | 117
Installment |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 156 | 178
Loans individually evaluated for impairment | 0 | 0
Loans collectively evaluated for impairment | 156 | 178
Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 23,102 | 25,324
Loans individually evaluated for impairment | 23,102 | 25,324
Loans collectively evaluated for impairment | 0 | 0
Mortgage |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 27,925 | 30,521
Loans individually evaluated for impairment | 0 | 0
Loans collectively evaluated for impairment | 27,925 | 30,521
HELOC |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 2,456 | 2,622
Loans individually evaluated for impairment | 0 | 0
Loans collectively evaluated for impairment | 2,456 | 2,622
Installment |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 1,253 | 2,292
Loans individually evaluated for impairment | 0 | 0
Loans collectively evaluated for impairment | 1,253 | 2,292
Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual and accruing TDRs | 3,697 | 4,553
Loans individually evaluated for impairment | 0 | 0
Loans collectively evaluated for impairment | $ 3,697 | $ 4,553

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