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Fair Value Measurements (Fair Value of Assets Measured on Nonrecurring Basis) (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Impaired loans: |  |
Impaired loans, Liquidation expense, Range |  | 10.00%
Maximum [Member] |  |
Impaired loans: |  |
Impaired loans, Discount rate, Range | 8.50% | 8.50%
Other real estate owned, Appraisal adjustment, Range | 30.00% | 30.00%
Other real estate owned, Liquidation expense, Range | 10.00% | 10.00%
Minimum [Member] |  |
Impaired loans: |  |
Impaired loans, Appraisal adjustment, Range | 10.00% | 10.00%
Impaired loans, Liquidation expense, Range | 10.00% |
Impaired loans, Discount rate, Range | 4.00% | 4.00%
Other real estate owned, Appraisal adjustment, Range | 20.00% | 20.00%
Other real estate owned, Liquidation expense, Range | 5.00% | 5.00%
Appraisal Of Collateral [Member] |  |
Impaired loans: |  |
Impaired loans | $ 1,200 | $ 510
Other real estate owned | 1,569 | 1,794
Discounted Cash Flows [Member] |  |
Impaired loans: |  |
Impaired loans | $ 5,896 | $ 6,005

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