Loans - Additional Information (Detail) (Residential, 1-4 Families [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
Residential, 1-4 Families [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential, 1-4 family loans, pledged against FHLB advances	$ 18,141,000	$ 17,765,000

The fair value, as of the date of each statement of financial position presented, of loans that are restricted as collateral for the payment of the FHLB debt obligations, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728

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