INVESTMENT SECURITIES - OTTI Losses on Available-for-Sale Debt Securities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Total other-than-temporary impairment losses
Portion of loss previously recognized in other comprehensive income	557	350	1,933	957
Net impairment losses recognized in earnings	557	350	1,933	957
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Portion of loss previously recognized in other comprehensive income	(557)	(350)	(1,933)	(957)
Net impairment losses recognized in earnings	$ (557)	$ (350)	$ (1,933)	$ (957)

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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+ Details

- Definition

Before tax amount of other than temporary impairment (OTTI) on a debt security, categorized as available-for-sale, recognized in other comprehensive income (loss), attributable to the parent entity.

+ References+ Details

- Definition

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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