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Derivatives - Fair Values of Derivative Instruments on Balance Sheet (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Fair Value of derivative assets	$ 20,390	$ 19,448
Loans held for sale [Member]
Derivatives, Fair Value [Line Items]
Fair Value of derivative assets	$ 96	$ 218

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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