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Subordinated Debentures - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified |  |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011 | Dec. 30, 2008 | Dec. 03, 2003 Private Placement [Member] | Sep. 30, 2012 Subordinated [Member] | Dec. 03, 2003 Subordinated [Member]
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Holding Company, closed a pooled private offering |  |  |  | 5,000 |  |
Trust preferred securities with a liquidation amount |  |  |  | $ 1 |  |
Subordinated debentures |  |  |  |  |  | $ 5,155
Holding Company's investment in the common stock | 155 |  |  |  |  |
Trust preferred securities and subordinated debentures have a variable rate of interest | 2.85% | 2.85% |  |  |  |
Trust preferred securities and subordinated debentures have a stated percentage | 3.31% | 3.43% |  |  |  |
Holding Company may redeem the subordinated debentures in a principal amount with integral multiples |  |  | $ 1 |  |  |
Percentage in which holding company redeem subordinated debentures |  |  | 100.00% |  |  |
Maturity date of subordinated debentures |  |  |  |  | Dec. 30, 2033 |
Cumulative deferred interest payments | $ 348 | $ 210 |  |  |  |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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