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Acquisition Activity - Summary of the Accretable Yield on the Acquired Loans (Detail) (Statewide Bank [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statewide Bank [Member]
Business Acquisition [Line Items]
Balance, beginning of period	$ (3,973)	$ (8,550)	$ (5,505)
Acquisition accretable yield				(11,110)
Accretion	5,417	4,613	5,170	5,605
Net transfers from nonaccretable difference to accretable yield	(3,578)	(36)	(8,215)
Balance, end of period	$ (2,134)	$ (3,973)	$ (8,550)	$ (5,505)