Securities and Loan Securities Carried at Fair Value - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2014	Sep. 30, 2013	Jul. 31, 2014	Sep. 30, 2014	Sep. 30, 2013
Fair Value Disclosures [Abstract]
Proceeds from sale of securities carried at fair value	$ 0	$ 3,255,000	$ 75,000		$ 12,345,000
Realized (gain) loss on sale of securities carried at fair value		(31,000)	2,000		(133,000)
Securities sold				0
Net unrealized gains (losses) on securities carried at fair value	$ 0	$ 0	$ 0	$ 73,000	$ 73,000