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Investment Securities - Additional Information (Detail) (USD $)		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013 Investment	Sep. 30, 2013 Government and Agencies Debt Securities Investment	Sep. 30, 2013 Government and Agencies Debt Securities Investment	Sep. 30, 2013 Municipal Obligations	Sep. 30, 2012 Agency mortgage-backed securities	Sep. 30, 2012 Agency mortgage-backed securities	Sep. 30, 2012 Agency CMO	Sep. 30, 2012 Agency CMO
Investment [Line Items]
Number of investment positions in continuous loss position	84	82	82
Percentage amount by which investment positions in continuous loss position had depreciated from amortized cost basis			3.20%
Gross gains on sales of available for sale securities		$ 8,000	$ 8,000	$ 21,000	$ 35,000	$ 2,000
Gross losses on sales of available for sale securities							$ 8,000	$ 8,000

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities 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

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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- Definition

This item represents the gross loss realized on the sale of debt or equity securities 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

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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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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This item represents the volatility of the security's fair value, represented as a percentage, which was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

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

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