Loans Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Recorded Investment [Abstract]
With No Related Allowance	$ 2,929	$ 2,144
With a Related Allowance	294	1,543
Unpaid Principal Balance [Abstract]
With No Related Allowance	2,928	2,185
With a Related Allowance	293	1,498
Average Recorded Balance [Abstract]
With No Related Allowance	2,537	2,113	$ 2,684
With a Related Allowance	920	773	0
Interest Income Recognized [Abstract]
With No Related Allowance	19	57	36
With a Related Allowance	0	26	0
Cash Basis Income [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	0	0	0
Commercial
Recorded Investment [Abstract]
With No Related Allowance	430	0
With a Related Allowance	0	485
Unpaid Principal Balance [Abstract]
With No Related Allowance	429	0
With a Related Allowance	0	489
Average Recorded Balance [Abstract]
With No Related Allowance	215	0	78
With a Related Allowance	243	243	0
Interest Income Recognized [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	0	1	0
Cash Basis Income [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	0	0	0
Commercial Real Estate
Recorded Investment [Abstract]
With No Related Allowance	793	781
With a Related Allowance	0	725
Unpaid Principal Balance [Abstract]
With No Related Allowance	793	816
With a Related Allowance	0	721
Average Recorded Balance [Abstract]
With No Related Allowance	787	836	1,631
With a Related Allowance	363	363	0
Interest Income Recognized [Abstract]
With No Related Allowance	0	34	29
With a Related Allowance	0	2	0
Cash Basis Income [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	0	0	0
Other Consumer
Recorded Investment [Abstract]
With No Related Allowance	101	94
With a Related Allowance	0	0
Unpaid Principal Balance [Abstract]
With No Related Allowance	100	95
With a Related Allowance	0	0
Average Recorded Balance [Abstract]
With No Related Allowance	98	93	103
With a Related Allowance	0	0	0
Interest Income Recognized [Abstract]
With No Related Allowance	1	0	6
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
Recorded Investment [Abstract]
With No Related Allowance	1,605	1,269
With a Related Allowance	294	333
Unpaid Principal Balance [Abstract]
With No Related Allowance	1,606	1,274
With a Related Allowance	293	288
Average Recorded Balance [Abstract]
With No Related Allowance	1,437	1,184	872
With a Related Allowance	314	167	0
Interest Income Recognized [Abstract]
With No Related Allowance	18	23	1
With a Related Allowance	0	23	0
Cash Basis Income [Abstract]
With No Related Allowance	0	0	0
With a Related Allowance	$ 0	$ 0	$ 0

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