Other Comprehensive Income (Loss) - Summary of Other Comprehensive Income (Loss) and Tax Impact (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gain(loss)on available for sale securities, income tax expense (benefit)	$ 21	$ (63)	$ 16	$ 57
Unrealized gain (loss) on interest rate swaps, income tax expense	$ 0	$ 26	$ 46	$ 95