Loans - Changes in FDIC Loss-Share Receivable (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Receivables [Abstract]
Balance, beginning of the period	$ 32,757	$ 44,996
Discount accretion of the present value at the acquisition dates	11	33
Effect of additional cash flows on covered loans (prospective recognition)	(1,856)	(1,482)
Decrease in the provision for losses on covered loans	0	(2,678)
Other reimbursable expenses	513	952
Reimbursements from the FDIC	1,424	(1,592)
Other	1,256	0
Balance, end of the period	$ 31,257	$ 43,413