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Derivative Activities (Narratives) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Unrealized Gain Loss On Derivatives | $ 868 | $ 1,000
Derivative Assets | 809 | 1,330
Derivative Liabilities | 1,677 | 2,437
Derivative, Notional Amount | 135,300 | 136,100
Interest Rate Cap [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Derivative Assets | 52 | 143
Derivative Liabilities | 52 | 139
Derivative, Notional Amount | 135,300 | 136,100
Designated as Hedging Instrument [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Derivative Liabilities | 868 | 1,004
Not Designated as Hedging Instrument [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Derivative Assets | 757 | 1,187
Derivative Liabilities | 757 | 1,187
Other derivative |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Derivative Liabilities | $ 0 | $ 107

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