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Securities Held to Maturity - Additional Information (Detail) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2011 | Jun. 30, 2010
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |  |  |
Held-to-maturity securities | $ 0 |  | $ 0 |
Amortized Cost on held-to-maturity |  |  |  | 22,400,000
Bonds in unrealized gain position | 800,000 |  |  |
Gain recognized in investment |  | 50,000 |  |
Obligations of States and Political Subdivisions [Member] |  |  |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |  |  |
Amortized Cost on held-to-maturity |  |  |  | 22,300,000
Unrealized loss position securities | 45,000 |  |  |
Other-than-temporary impairment charges |  | 45,000 |  |
Mortgage-Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |  |  |
Amortized Cost on held-to-maturity |  |  |  | $ 100,000

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- Definition For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 5 -Chapter 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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