Deposits - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Schedule Of Deposits [Line Items]
Overdrawn deposit balances classified as consumer loans	$ 1,096,000	$ 1,216,000
California [Member]
Schedule Of Deposits [Line Items]
Certificate of deposits, included in time certificates $100,000 and over	$ 5,000,000	$ 5,000,000

Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 405

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479006&loc=d3e64164-112818

Name:	us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant