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Investment Securities - Additional Information (Detail)	Jun. 30, 2013 Security	Dec. 31, 2012 Security
Investments Debt And Equity Securities [Abstract]
Number of securities having unrealized holding losses with aggregate depreciation	11	9
Unrealized holding losses depreciation	2.90%	1.90%

X

- Definition

Unrealized holding losses depreciation percentage from amortized cost.

+ References

No definition available.

+ Details

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X

- Definition

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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