Other Comprehensive Income - Summary of Other Comprehensive Income (Loss) and Tax Impact (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Amounts Reclassified Out Of Accumulated Other Comprehensive Income Loss [Abstract]
Unrealized (loss) gain on available for sale securities, income tax expenses (benefit)	$ 31	$ 87	$ 85	$ 166
Unrealized gain (loss) on interest rate swaps, income tax expense (benefit)	$ 19	$ 37	$ 103	$ 91