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Information Pertaining to Investment Securities Aggregated by Investment Category and Length of Time (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	$ (897)	$ (1,458)
Fair Value	110,570	146,688
Gross Unrealized Losses	(40)	(147)
Fair Value	1,060	2,927
US Government agencies
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	(6)
Fair Value	1,288
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	(107)	(26)
Fair Value	9,085	1,735
Gross Unrealized Losses	(40)	(119)
Fair Value	1,060	1,978
U.S. Government agencies collateralized by mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	(784)	(1,432)
Fair Value	100,197	144,953
Gross Unrealized Losses		(28)
Fair Value		$ 949

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- Definition

Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities.

+ References

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Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for securities categorized neither as held-to-maturity nor trading securities.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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