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Loans (Loans Individually And Collectively Evaluated For Impairment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 1,091 | $ 548
Nonaccrual and accruing restructured loans | 105,517 | 106,050
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 70,127 | 70,426
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 35,390 | 35,624
Partial Charge-Offs On Impaired Loans | 23,731 | 24,943
Commercial Financial And Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 22,592 | 20,657
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 22,542 | 20,624
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 50 | 33
Construction Real Estate Commercial [Domain] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 2,041 | 2,226
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 2,041 | 2,226
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 | 103 | 104
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 103 | 104
Construction Real Estate - Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 150 | 156
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 150 | 156
Residential Real Estate - Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 22,803 | 23,102
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 22,803 | 23,102
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 | 27,615 | 27,925
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 27,615 | 27,925
Residential Real Estate - HELOC [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 2,532 | 2,456
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 2,532 | 2,456
Residential Real Estate - Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 1,207 | 1,253
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 1,207 | 1,253
Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 179 | 309
Nonaccrual and accruing restructured loans | 22,732 | 24,474
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 22,732 | 24,474
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 | 9 | 0
Nonaccrual and accruing restructured loans | 3,742 | 3,697
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 9 |
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 3,733 | 3,697
Financing Receivable With No Related Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Partial Charge-Offs On Impaired Loans | $ 17,400 | $ 24,700

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