Covered Loans - Schedule of Accretable Yield, or Income Expected to be Collected (Detail) (Covered Loans [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013
Covered Loans [Member]
Covered Loans [Line Items]
Balance at January 1	$ 73,211	$ 85,779
New loans purchased
Accretion of income	(24,950)	(19,174)
Reclassifications from (to) nonaccretable difference	14,494	8,873
Disposals/other adjustments	1,905	1,663
Balance at June 30	$ 64,660	$ 77,141

The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

No definition available.

Name:	us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant