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Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Derivative [Line Items] |  |
Derivative, Notional Amount1 | $ 10,442 | $ 10,734
DerivativeAssetFairValueGrossAsset | 961 | 1,210
Derivative Asset, Fair Value, Gross Liability | 961 | 1,210
Derivative, Interest Rate Swap, Pay Fixed, Receive Variable [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount1 | 5,221 | 5,367
DerivativeAssetFairValueGrossAsset | 0 | 0
Derivative Asset, Fair Value, Gross Liability | 961 | 1,210
Derivative, Interest Rate Swap, Pay Variable, Receive Fixed [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount1 | 5,221 | 5,367
DerivativeAssetFairValueGrossAsset | 961 | 1,210
Derivative Asset, Fair Value, Gross Liability | $ 0 | $ 0

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