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Other Comprehensive Income - Summary of Other Comprehensive Income (Loss) and Tax Impact (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Amounts Reclassified Out Of Accumulated Other Comprehensive Income Loss [Abstract]
Unrealized (loss) gain on available for sale securities, income tax expenses (benefit)	$ (144)	$ (13)	$ (118)	$ 80
Unrealized gain (loss) on interest rate swaps, income tax expense (benefit)	$ 45	$ (29)	$ 84	$ (55)

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- Definition

Other comprehensive income unrealized gain loss on derivatives during period tax.

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No definition available.

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- Definition

Other comprehensive income unrealized holding gain loss on securities during period tax.

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No definition available.

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