INVESTMENT SECURITIES, Rollforward Related to OTTI Credit Losses (Details) (Available-for-sale Securities [Member], USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Available-for-sale Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Beginning balance	$ 115,243	$ 114,891	$ 124,340	$ 107,671
Addition of other-than-temporary impairment that was not previously recognized	0	0	0	0
Additional increases to the amount related to the credit loss for which an other-than-temporary impairment was previously recognized	0	888	464	8,108
Reduction for securities sold	0	0	(9,561)	0
Ending balance	$ 115,243	$ 115,779	$ 115,243	$ 115,779

This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which a previous OTTI was recognized and the investor does not intend to sell the debt security and it is not more likely than not that the investor will be required to sell the debt security before recovery of its amortized cost basis.

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This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized.

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The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security because of the sale of impaired securities during the period.

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