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Fair Value Measurements (Fair Value of Assets Measured on Nonrecurring Basis) (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Appraisal Of Collateral [Member] |  |
Impaired loans: |  |
Impaired loans | $ 2,489 | $ 3,839
Other real estate owned | $ 74 | $ 1,222
Appraisal Of Collateral [Member] | Maximum [Member] |  |
Impaired loans: |  |
Impaired loans, Appraisal adjustment, Range |  | 17.00%
Impaired loans, Liquidation expense, Range |  | 10.00%
Other real estate owned, Appraisal adjustment, Range | 31.00% | 40.00%
Other real estate owned, Liquidation expense, Range |  | 10.00%
Appraisal Of Collateral [Member] | Minimum [Member] |  |
Impaired loans: |  |
Impaired loans, Appraisal adjustment, Range | 10.00% | 0.00%
Impaired loans, Liquidation expense, Range |  | 0.00%
Other real estate owned, Appraisal adjustment, Range | 0.00% | 15.00%
Other real estate owned, Liquidation expense, Range | 10.00% | 5.00%
Discounted Cash Flow Analysis [Member] |  |
Impaired loans: |  |
Impaired loans | $ 2,599 | $ 5,902
Discounted Cash Flow Analysis [Member] | Maximum [Member] |  |
Impaired loans: |  |
Impaired loans, Discount rate, Range | 7.25% | 7.25%
Discounted Cash Flow Analysis [Member] | Minimum [Member] |  |
Impaired loans: |  |
Impaired loans, Discount rate, Range | 4.00% | 4.00%

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