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Disclosures About Fair Value of Assets and Liabilities - Additional Information (Detail) (USD $)	6 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2012 Significant Unobservable Inputs (Level 3)	Jun. 30, 2012 Moody's ratings at Inception	Jun. 30, 2012 Moody's, Ca Rating	Jun. 30, 2012 Moody's, C Rating
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trust preferred securities, carrying value		$ 5,900,000
Trust preferred securities, fair value		168,000
Other-than-temporary impairment ("OTTI") loss	$ 400,000
Securities rating			A or better	Ca	C

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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