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Loans and Asset Quality Information (Schedule of Accruing Restructured Loans Defaulted in Period) (Details) - All Total Loans [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Accruing TDRs that subsequently defaulted
Number of Contracts - Subsequently defaulted	1	1
Recorded Investment - Subsequently defaulted	$ 570	$ 626
Real estate - mortgage - residential (1-4 family) first mortgages [Member]
Accruing TDRs that subsequently defaulted
Number of Contracts - Subsequently defaulted		1
Recorded Investment - Subsequently defaulted		$ 626
Real estate - mortgage - commercial and other [Member]
Accruing TDRs that subsequently defaulted
Number of Contracts - Subsequently defaulted	1
Recorded Investment - Subsequently defaulted	$ 570

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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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