Other Investments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Other Investments Disclosure [Abstract]
Other investments	$ 44,077		$ 35,444
Proceeds from the redemption of FHLB stock	$ 10,025	$ 4,984