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Amortized Cost and Estimated Fair Value of Held-to-Maturity Securities, Including Gross Unrealized Gains and Losses (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 567	$ 816
Unrealized Gains	5	16
Unrealized Losses
Fair Value	572	832
Municipal securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	567	816
Unrealized Gains	5	16
Unrealized Losses
Fair Value	$ 572	$ 832

X

- Definition

This item represents the excess of amortized cost basis over fair value of securities in a gain position and which are categorized as held-to-maturity.

+ References

No definition available.

+ Details

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- Definition

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturity.

+ References

No definition available.

+ Details

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X

- Definition

Held to maturity securities amortized cost basis.

+ References

No definition available.

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X

- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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