Other Comprehensive Income (Loss) - Summary of Reclassification Out of Each Component of Accumulated Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Equity [Abstract]
Amounts reclassified from accumulated other comprehensive income, Total	$ (328)	$ 0	$ (362)	$ (2,578)
Realized net gains on the sale of available for sale securities, tax expense (benefit)	115	0	127	0
Realized net gains on the sale of available for sale securities, gains on securities available for sale, net of tax	(213)	0	(235)	(2,578)
Total reclassification during the period	$ (213)	$ 0	$ (235)	$ (2,578)