STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement
Balance, beginning of the period	$ (30,459)	$ 4,669	$ (33,940)
Net unrealized gains (losses) arising during period	40,911	(27,833)	42,899
Less: reclassification adjustment for losses included in net income	(6,215)	(7,295)	(452)
Net unrealized gains (losses)	34,696	(35,128)	42,447
Noncredit-related impairment loss on securities			(2,938)
Foreign exchange translation adjustment			(900)
Balance, end of the period	4,237	(30,459)	4,669
Investment Securities Available-for-Sale
Statement
Balance, beginning of the period	(30,538)	4,643	(34,848)
Net unrealized gains (losses) arising during period	41,008	(28,169)	42,868
Less: reclassification adjustment for losses included in net income	(6,294)	(7,012)	(439)
Net unrealized gains (losses)	34,714	(35,181)	42,429
Noncredit-related impairment loss on securities			(2,938)
Balance, end of the period	4,176	(30,538)	4,643
Other Investments
Statement
Balance, beginning of the period	79	26	8
Net unrealized gains (losses) arising during period	(97)	336	31
Less: reclassification adjustment for losses included in net income	79	(283)	(13)
Net unrealized gains (losses)	(18)	53	18
Balance, end of the period	61	79	26
Foreign Currency Translation Adjustment
Statement
Balance, beginning of the period				900
Foreign exchange translation adjustment			(900)
Balance, end of the period			$ 0	$ 900