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Securities (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) security	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) security	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]
Securities evaluated for other than temporary impairment	60		60
Available-for-sale Securities, Gross Realized Gains | $	$ 0	$ 51	$ 0	$ 113
Available-for-sale Securities, Gross Realized Losses | $	0	$ 0	0	$ 0
Held-to-maturity securities sales | $	$ 0		$ 0		$ 0
US Agency Obligations [Member]
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]
Securities evaluated for other than temporary impairment	34		34
Municipals [Member]
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]
Securities evaluated for other than temporary impairment	21		21
Corporates [Member]
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]
Securities evaluated for other than temporary impairment	5		5
S&P Rated AAA [Member]
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]
Securities evaluated for other than temporary impairment	10		10
S&P Rated AA [Member]
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]
Securities evaluated for other than temporary impairment	47		47
S&P Rated A [Member]
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]
Securities evaluated for other than temporary impairment	2		2
S&P Rated BBB+ [Member]
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]
Securities evaluated for other than temporary impairment	1		1

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