Commitments, Contingent Liabilities and Other Disclosures - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments And Contingencies Disclosure [Abstract]
Rent expense for premises and equipment		$ 3,852	$ 3,832	$ 4,254
Legal and other expenses	1,200	2,900		1,700
Required average cash reserve to be maintain		15,874
Declaration of additional dividend		$ 15,100