Loans Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Recorded Investment [Abstract]
With No Related Allowance	$ 2,144	$ 2,079
With a Related Allowance	1,543	0
Unpaid Principal Balance [Abstract]
With No Related Allowance	2,185	2,079
With a Related Allowance	1,498	0
Average Recorded Balance [Abstract]
With No Related Allowance	2,113	2,684	$ 3,535
With a Related Allowance	773	0	280
Interest Income Recognized [Abstract]
With No Related Allowance	57	36	23
With a Related Allowance	26	0	0
Cash Basis Income [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	0	0	0
Commercial [Member]
Recorded Investment [Abstract]
With No Related Allowance	0	0
With a Related Allowance	485	0
Unpaid Principal Balance [Abstract]
With No Related Allowance	0	0
With a Related Allowance	489	0
Average Recorded Balance [Abstract]
With No Related Allowance	0	78	325
With a Related Allowance	243	0	0
Interest Income Recognized [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	1	0	0
Cash Basis Income [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	0	0	0
Commercial Real Estate [Member]
Recorded Investment [Abstract]
With No Related Allowance	781	890
With a Related Allowance	725	0
Unpaid Principal Balance [Abstract]
With No Related Allowance	816	890
With a Related Allowance	721	0
Average Recorded Balance [Abstract]
With No Related Allowance	836	1,631	1,932
With a Related Allowance	363	0	0
Interest Income Recognized [Abstract]
With No Related Allowance	34	29	9
With a Related Allowance	2	0	0
Cash Basis Income [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	0	0	0
Other Consumer [Member]
Recorded Investment [Abstract]
With No Related Allowance	94	91
With a Related Allowance	0	0
Unpaid Principal Balance [Abstract]
With No Related Allowance	95	91
With a Related Allowance	0	0
Average Recorded Balance [Abstract]
With No Related Allowance	93	103	116
With a Related Allowance	0	0	0
Interest Income Recognized [Abstract]
With No Related Allowance	0	6	14
With a Related Allowance	0	0	0
Cash Basis Income [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	0	0	0
Residential Portfolio Segment [Member]
Recorded Investment [Abstract]
With No Related Allowance	1,269	1,098
With a Related Allowance	333	0
Unpaid Principal Balance [Abstract]
With No Related Allowance	1,274	1,098
With a Related Allowance	288	0
Average Recorded Balance [Abstract]
With No Related Allowance	1,184	872	1,162
With a Related Allowance	167	0	280
Interest Income Recognized [Abstract]
With No Related Allowance	23	1	0
With a Related Allowance	23	0	0
Cash Basis Income [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	$ 0	$ 0	$ 0

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Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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