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Derivative Instruments (Schedule Of Mortgage Banking Derivatives) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Interest Rate Commitments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount, Assets | $ 46,683 | $ 2,390
Fair value, Derivative assets | 203 | $ 11
TBA Mortgage-Back Securities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount, Assets | 35,500 |
Fair value, Derivative assets | $ 128 |

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