Deposits - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Banking and Thrift [Abstract]
Accrued interest payable	$ 6,000	$ 9,000
Time deposits, $100,000 and over	$ 64,416,000us-gaap_TimeDeposits100000OrMore	$ 64,380,000us-gaap_TimeDeposits100000OrMore

The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 405

-Section 50

-Paragraph 1

-Subparagraph (a)

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Industry Guide

-Number 3

-Section V

-Paragraph A

-Subparagraph 4

Name:	us-gaap_TimeDeposits100000OrMore
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant