Assets Acquired in FDIC-Assisted Acquisitions - Changes in FDIC Share-Loss Receivable (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Business Combinations [Abstract]
Balance, beginning of year	$ 65,441	$ 159,724	$ 159,724
Indemnification asset recorded in acquisitions
Payments received from FDIC	(6,773)	(6,324)	(68,822)
Effect of change in expected cash flows on covered assets	(5,487)	7,579	(25,461)
Balance, end of year	$ 53,181	$ 160,979	$ 65,441

The amount of indemnification assets (amounts to be reimbursed if and when certain assumed liabilities are paid) recognized at the acquisition date of a business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

Name:	us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant