Securities (Fair Value and Gross Unrealized Losses for Securities Available for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Fair Value, Less than 12 months	$ 20,411	$ 63,965
Fair Value, 12 months or more	30,433	0
Fair Value, Total	50,844	63,965
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Gross Unrealized Losses, Less than 12 months	144	1,327
Gross Unrealized Losses, 12 months or more	646	0
Gross Unrealized Losses, Total	790	1,327
Obligations of U.S. government corporations and agencies [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Fair Value, Less than 12 months	4,455	19,129
Fair Value, 12 months or more	7,810	0
Fair Value, Total	12,265	19,129
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Gross Unrealized Losses, Less than 12 months	58	279
Gross Unrealized Losses, 12 months or more	200	0
Gross Unrealized Losses, Total	258	279
Mortgage-backed securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Fair Value, Less than 12 months	11,885	28,013
Fair Value, 12 months or more	17,931	0
Fair Value, Total	29,816	28,013
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Gross Unrealized Losses, Less than 12 months	59	456
Gross Unrealized Losses, 12 months or more	287	0
Gross Unrealized Losses, Total	346	456
Obligations of states and political subdivisions [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Fair Value, Less than 12 months	4,071	16,823
Fair Value, 12 months or more	4,692	0
Fair Value, Total	8,763	16,823
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Gross Unrealized Losses, Less than 12 months	27	592
Gross Unrealized Losses, 12 months or more	159	0
Gross Unrealized Losses, Total	$ 186	$ 592

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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