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Derivative Activities (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Unrealized Gain Loss On Derivatives	$ 146	$ 510
Derivative Assets	898	771
Derivative Liabilities	752	1,281
Derivative, Notional Amount	152,200	152,600
Interest Rate Cap [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Derivative Assets	293	153
Derivative Liabilities	293	153
Derivative, Notional Amount	152,200	152,600
Designated as Hedging Instrument [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Derivative Assets	146	0
Derivative Liabilities	0	510
Not Designated as Hedging Instrument [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Derivative Assets	459	618
Derivative Liabilities	459	618
Other derivative
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Derivative Liabilities	$ 0	$ 0

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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