FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Securities Available-For-Sale: Corporate Debt Securities
Reconciliation of assets measured on Level 3 basis
Balance at the beginning of the period	$ 67,233	$ 83,097
Total gain or losses (for the period)
Included in earnings	1,171	7,599
Included in other comprehensive income	12,202	(18,836)
Transfers into Level 3		12,986
Transfers out of Level 3	(2,721)	(17,332)
Purchases		23,903
Sales	(24,660)	(10,772)
Settlements	(11,004)	(13,412)
Balance at the end of the period	42,221	67,233
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	506
Other Securities, at Estimated Fair Value
Reconciliation of assets measured on Level 3 basis
Balance at the beginning of the period	2,778
Total gain or losses (for the period)
Included in earnings	131	2,378
Purchases		400
Balance at the end of the period	2,909	2,778
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	131	2,378
Residential mortgage-backed securities, at estimated fair value
Reconciliation of assets measured on Level 3 basis
Balance at the beginning of the period	86,479	93,929
Total gain or losses (for the period)
Included in earnings	6,306	(457)
Settlements	(8,943)	(6,993)
Balance at the end of the period	83,842	86,479
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	28,543	17,765
Corporate Loans, at Estimated Fair Value
Total gain or losses (for the period)
Included in earnings	429
Purchases	15,056
Settlements	656
Balance at the end of the period	16,141
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	429
Equity investments, at estimated fair value
Reconciliation of assets measured on Level 3 basis
Balance at the beginning of the period	150,962	84,932
Total gain or losses (for the period)
Included in earnings	1,708	27,878
Transfers out of Level 3	(34,230)	(28,546)
Purchases	18,060	87,761
Sales	(4,365)	(30,121)
Settlements	(34,389)	9,058
Balance at the end of the period	97,746	150,962
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	14,579	18,027
Total rate of return swaps
Reconciliation of assets measured on Level 3 basis
Balance at the beginning of the period	152	104
Total gain or losses (for the period)
Included in earnings	141	48
Settlements	(293)
Balance at the end of the period		152
Common stock warrants
Reconciliation of assets measured on Level 3 basis
Balance at the beginning of the period	1,266	3,453
Total gain or losses (for the period)
Included in earnings	308	(4)
Settlements		(2,183)
Balance at the end of the period	1,574	1,266
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	308	(1,448)
Foreign exchange options
Reconciliation of assets measured on Level 3 basis
Balance at the beginning of the period	13,394	14,791
Total gain or losses (for the period)
Included in earnings	(5,117)	(1,397)
Balance at the end of the period	8,277	13,394
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	(5,117)	(1,397)
Interests in joint ventures and partnerships
Total gain or losses (for the period)
Included in earnings	4,391
Transfers into Level 3	34,230
Purchases	104,728
Settlements	(872)
Balance at the end of the period	142,477
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	4,391
Other assets
Reconciliation of assets measured on Level 3 basis
Balance at the beginning of the period	567
Total gain or losses (for the period)
Included in earnings	342	10
Sales	(706)
Settlements	(203)	557
Balance at the end of the period		567
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period		$ 10