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Loans and Asset Quality Information (Schedule of Accruing Restructured Loans Defaulted in Period) (Details) $ in Thousands	12 Months Ended
	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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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.

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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.

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