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Loans and Asset Quality Information (Schedule of Accruing Restructured Loans Defaulted in Period) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) N | Dec. 31, 2016 USD ($) N
All Total Loans [Member] |  |
Accruing TDRs that subsequently defaulted |  |
Number of Contracts - Subsequent Default | N | 2 | 3
Subsequently defaulted - Recorded Investment | $ | $ 880 | $ 765
All Total Loans [Member] | Commercial, financial, and agricultural [Member] |  |
Accruing TDRs that subsequently defaulted |  |
Number of Contracts - Subsequent Default | N |  | 2
Subsequently defaulted - Recorded Investment | $ |  | $ 744
All Total Loans [Member] | Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |
Accruing TDRs that subsequently defaulted |  |
Number of Contracts - Subsequent Default | N | 2 |
Subsequently defaulted - Recorded Investment | $ | $ 880 |
All Total Loans [Member] | Real estate - mortgage - commercial and other [Member] |  |
Accruing TDRs that subsequently defaulted |  |
Number of Contracts - Subsequent Default | N |  | 1
Subsequently defaulted - Recorded Investment | $ |  | $ 21
Covered [Member] |  |
Accruing TDRs that subsequently defaulted |  |
Number of Contracts - Subsequent Default | N |  | 1
Subsequently defaulted - Recorded Investment | $ |  | $ 44

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default within the period. + References No definition available. + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default in the period. + References No definition available. + Details
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