INVESTMENT SECURITIES, Rollforward Related to OTTI Credit Losses (Details) (Available-for-sale Securities [Member], USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Available-for-sale Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Beginning balance	$ 115,243	$ 112,470	$ 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	2,421	464	7,220
Reduction for securities sold	0	0	(9,561)	0
Ending balance	$ 115,243	$ 114,891	$ 115,243	$ 114,891