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Loans (Loans Individually And Collectively Evaluated For Impairment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 1,207 | $ 684
Nonaccrual and accruing restructured loans | 84,908 | 92,233
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 50,322 | 56,564
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 34,586 | 35,669
Partial Charge-Offs On Impaired Loans | 9,972 | 10,040
Commercial Financial And Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 27,073 | 18,064
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 27,050 | 18,039
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 23 | 25
Construction Real Estate Commercial [Domain] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 1,393 | 1,324
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 1,393 | 1,324
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 | 16 | 100
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 16 | 100
Construction Real Estate - Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 49 | 52
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 49 | 52
Residential Real Estate - Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 2,896 | 19,059
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 2,896 | 19,059
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 | 26,878 | 27,607
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 26,878 | 27,607
Residential Real Estate - HELOC [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 2,364 | 2,618
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 2,364 | 2,618
Residential Real Estate - Installment [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual and accruing restructured loans | 1,222 | 1,202
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 0 | 0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 1,222 | 1,202
Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 29 | 2
Nonaccrual and accruing restructured loans | 18,983 | 18,142
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment | 18,983 | 18,142
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 | 4,034 | 4,065
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment | 4,034 | 4,065
Financing Receivable With No Related Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Partial Charge-Offs On Impaired Loans | $ 5,800 | $ 7,900

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