Contractual Maturities of Federal Home Loan Bank Advances (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Scheduled Principal Payments For Borrowings [Line Items]
2013	$ 0
2014	30,500
2015	5,500
2016	7,000
2017	36,500
Thereafter	0
Federal Home Loan Bank, Advances, Total	$ 79,500

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Amount of federal home loan bank advances. Advances are loans from the federal home loan bank system to a member (shareholder).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 14

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 17, 37

-IssueDate 2006-05-01

-Chapter 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Amount of federal home loan bank advances maturing after the fifth rolling twelve months following the latest balance sheet presented.

+ References

No definition available.

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- Definition

Amount of federal home loan bank advances maturing in the next rolling twelve months following the latest balance sheet presented.

+ References

No definition available.

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Amount of federal home loan bank advances maturing in the fifth rolling twelve months following the latest balance sheet presented.

+ References

No definition available.

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- Definition

Amount of federal home loan bank advances maturing in the fourth rolling twelve months following the latest balance sheet presented.

+ References

No definition available.

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Amount of federal home loan bank advances maturing in the third rolling twelve months following the latest balance sheet presented.

+ References

No definition available.

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- Definition

Amount of federal home loan bank advances maturing in the second rolling twelve months following the latest balance sheet presented.

+ References

No definition available.

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