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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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