Assets Acquired in FDIC-Assisted Acquisitions - Loan-by-Loan Basis Performance of Fair Value Adjustments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Business Combinations [Abstract]
Adjustments needed where the Company's initial estimate of cash flows were underestimated (recorded with a reclassification from non-accretable difference to accretable discount)	$ 51,003	$ 23,050
Adjustments needed where the Company's initial estimate of cash flows were overstated (recorded through a provision for loan losses)	7,695	13,190
Adjustments needed where the Company's initial estimate of cash flows were underestimated (recorded with a reclassification from non-accretable difference to accretable discount)	10,201	4,610
Adjustments needed where the Company's initial estimate of cash flows were overstated (recorded through a provision for loan losses)	$ 1,539	$ 2,638