Loans Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Recorded Investment [Abstract]
With No Related Allowance	$ 2,079	$ 3,286
With a Related Allowance	0	0
Unpaid Principal Balance [Abstract]
With No Related Allowance	2,079	3,286
With a Related Allowance	0	0
Average Recorded Balance [Abstract]
With No Related Allowance	2,684	3,535	$ 3,634
With a Related Allowance	0	280	546
Interest Income Recognized [Abstract]
With No Related Allowance	36	23	19
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
Commercial [Member]
Recorded Investment [Abstract]
With No Related Allowance	0	155
With a Related Allowance	0	0
Unpaid Principal Balance [Abstract]
With No Related Allowance	0	155
With a Related Allowance	0	0
Average Recorded Balance [Abstract]
With No Related Allowance	78	325	348
With a Related Allowance	0	0	0
Interest Income Recognized [Abstract]
With No Related Allowance	0	0	11
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
Commercial Real Estate [Member]
Recorded Investment [Abstract]
With No Related Allowance	890	2,372
With a Related Allowance	0	0
Unpaid Principal Balance [Abstract]
With No Related Allowance	890	2,372
With a Related Allowance	0	0
Average Recorded Balance [Abstract]
With No Related Allowance	1,631	1,932	1,492
With a Related Allowance	0	0	0
Interest Income Recognized [Abstract]
With No Related Allowance	29	9	0
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
Other Consumer [Member]
Recorded Investment [Abstract]
With No Related Allowance	91	114
With a Related Allowance	0	0
Unpaid Principal Balance [Abstract]
With No Related Allowance	91	114
With a Related Allowance	0	0
Average Recorded Balance [Abstract]
With No Related Allowance	103	116	121
With a Related Allowance	0	0	0
Interest Income Recognized [Abstract]
With No Related Allowance	6	14	7
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	1,098	645
With a Related Allowance	0	0
Unpaid Principal Balance [Abstract]
With No Related Allowance	1,098	645
With a Related Allowance	0	0
Average Recorded Balance [Abstract]
With No Related Allowance	872	1,162	1,673
With a Related Allowance	0	280	546
Interest Income Recognized [Abstract]
With No Related Allowance	1	0	1
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

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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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