Gross Unrealized Losses and Fair Value by Length of Time of Available-For-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 23,226	$ 11,271
Less than 12 months	72	37
More than 12 months	288	480
Total Unrealized Losses	360	517
Available-for-Sale Securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities	6	6
US States and Political Subdivisions Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value		397
Less than 12 months		2
Total Unrealized Losses		2
US States and Political Subdivisions Debt Securities \| Available-for-Sale Securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities		1
Mortgage-Backed
Schedule of Available-for-sale Securities [Line Items]
Fair Value	19,806	5,081
Less than 12 months	64	13
Total Unrealized Losses	64	13
Mortgage-Backed \| Available-for-Sale Securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities	4	3
Corporate Debt
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,992	3,326
Less than 12 months	8	22
Total Unrealized Losses	8	22
Corporate Debt \| Available-for-Sale Securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities	1	1
Other Debt Obligations
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,428	2,467
More than 12 months	288	480
Total Unrealized Losses	$ 288	$ 480
Other Debt Obligations \| Available-for-Sale Securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities	1	1

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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

No definition available.

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Amount of the excess of amortized cost basis over fair value of securities in a loss position and categorized neither as held-to-maturity nor trading securities.

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

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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.

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

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

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-Paragraph 21

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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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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.

+ References

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