Securities and Loan Securities Carried at Fair Value - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value Disclosures [Abstract]
Proceeds from sale of securities carried at fair value	$ 19,918,000	$ 28,133,000	$ 35,156,000
Realized gain (loss) on sale of securities carried at fair value	742,000	655,000	123,000
Net unrealized gain on securities carried at fair value	$ 73,000	$ 7,363,000	$ 5,526,000