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Derivative Financial Instruments - Fair Value of Derivative Financial Instruments and Their Classification on Balance Sheet (Details) (Interest rate contracts, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Designated as Hedging Instrument \| Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 440	$ 197
Designated as Hedging Instrument \| Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	1,409	3,332
Not Designated as Hedging Instrument \| Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	3,186	6,103
Not Designated as Hedging Instrument \| Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 3,252	$ 6,434

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details