Legal Proceedings - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2014
Gain Contingencies [Line Items]
Additions to other significant pending legal or other proceedings	$ 0
Minimum [Member]
Gain Contingencies [Line Items]
Reasonably possible losses for loan proceedings	500,000
Maximum [Member]
Gain Contingencies [Line Items]
Reasonably possible losses for loan proceedings	5,000,000
Goldstein Case [Member]
Gain Contingencies [Line Items]
Disputed amount	$ 5,000,000

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Name:	us-gaap_GainLossRelatedToLitigationSettlement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration