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Loans (Loans Individually And Collectively Evaluated For Impairment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 4,930 | $ 4,191
Nonaccrual and accruing restructured loans | 117,719 | 120,975
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 78,171 | 80,664
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 39,548 | 40,311
Partial Charge-Offs On Impaired Loans | 28,422 | 28,705
Commercial Financial And Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 28,610 | 30,623
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 28,596 | 30,595
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 14 | 28
Construction Real Estate, SEPH Commercial Land and Development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 2,043 | 2,044
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 2,043 | 2,044
Construction Real Estate - Remaining Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 4,845 | 4,676
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 4,845 | 4,676
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 0 | 0
Construction Real Estate - Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 114 | 117
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 114 | 117
Construction Real Estate - Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 129 | 178
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 129 | 178
Residential Real Estate - Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 24,619 | 25,324
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 24,619 | 25,324
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 0 | 0
Residential Real Estate - Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 30,580 | 30,521
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 30,580 | 30,521
Residential Real Estate - HELOC [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 2,482 | 2,622
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 2,482 | 2,622
Residential Real Estate - Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 2,053 | 2,292
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 2,053 | 2,292
Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 593 | 381
Nonaccrual and accruing restructured loans | 18,068 | 18,025
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 18,068 | 18,025
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 0 | 0
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0
Nonaccrual and accruing restructured loans | 4,176 | 4,553
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 4,176 | 4,553
Financing Receivable With No Related Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Partial Charge-Offs On Impaired Loans | $ 24,000 | $ 24,200

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