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Derivative Financial Instruments - Fair Value of Derivative Financial Instruments and Their Classification on Balance Sheet (Detail) (Interest Rate Contract, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Designated as Hedging Instrument \| Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 197	$ 424
Designated as Hedging Instrument \| Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	3,332	2,305
Not Designated as Hedging Instrument \| Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	6,103	5,241
Not Designated as Hedging Instrument \| Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 6,434	$ 5,492

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