INVESTMENT SECURITIES (Details 2) (Available-for-sale Securities, USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Available-for-sale Securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings
Beginning balance	$ 115,412	$ 124,340	$ 115,511	$ 115,243
Additional increases to the amount related to the credit loss for which an other-than-temporary impairment was previously recognized	99	464
Reduction for securities sold		(9,561)
Ending balance	$ 115,511	$ 115,243	$ 115,511	$ 115,243