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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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Gross Gains Resulting From Investment Securities Called And Other

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Held To Maturity Securities Amortized Cost

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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.

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This item represents the fair value of securities categorized as held-to-maturity which are in an unrealized loss position.

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The amount by which the fair value of an investment in debt securities categorized as Held-to-maturity is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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The increase (decrease), resulting in a gain, in the difference between the fair value and the carrying value, or in the comparative fair values, of securities held at each balance sheet date, that was included in earnings for the period.

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