FAIR VALUE MEASUREMENTS (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Available-for-sale Securities [Member]
Bonds Available-for-Sale, Beginning Balance	$ 896,322		$ 1,006,539		$ 969,394		$ 1,021,628
Bonds Available-for-Sale , Net losses included in earnings	(1,321)		(3,373)		(4,589)		(6,397)
Bonds Available-for-Sale, Net gains (losses) included in other comprehensive lncome	(80,682)	[1]	15,085	[2]	(91,980)	[3]	31,806	[4]
Bonds Available-for Sale, Impact from purchases			0				6,189
Bonds Available-for Sale, Impact from sales/redemptions	(606,121)		0		(612,154)		(8,172)
Bonds Available-for Sale, Bonds eliminated due to real estate consolidation and foreclosure	10,168		21,545		55,275		34,108
Bonds Available-for Sale, Impact from settlements	(1,545)		(2,419)		(8,911)		(16,659)
Bonds Available-for Sale, Transfer into Level 3							0
Bonds Available-for-Sale, Ending Balance	196,485		994,287		196,485		994,287
Derivative Financial Instruments, Liabilities [Member]
Derivative Liabilities, Beginning Balance	(694)		(1,192)		(1,067)		(1,167)
Derivative Liabilities, Net losses included in earnings	32		(27)		259		429
Derivative Liabilities, Net gains (losses) included in other comprehensive lncome	0	[1]	0	[2]	0	[3]	0	[4]
Derivative Liabilities, Impact from purchases			0				0
Derivative Liabilities, Impact from sales/redemptions	0		0		0		0
Derivative Liabilities, Bonds eliminated due to real estate consolidation and foreclosure	0		0		0		0
Derivative Liabilities, Impact from settlements	0		0		146		128
Derivative Liabilities, Transfer into Level 3							(609)
Derivative Liabilities, Ending Balance	$ (662)		$ (1,219)		$ (662)		$ (1,219)

[1] This amount includes $5.2 million of unrealized net holding losses arising during the period, which is then reduced by $0.9 million of unrealized bond losses reclassified into operations. This amount is then increased by $76.4 million of unrealized gains related to bonds that were redeemed.

[2] This amount includes $12.8 million of unrealized net holding gains arising during the period, which is then increased by $2.3 million of unrealized bond losses reclassified into operations.

[3] This amount includes $16.8 million of unrealized net holding losses arising during the period, which is then reduced by $1.8 million of unrealized bond losses reclassified into operations. This amount is then increased by $77.0 million of unrealized gains related to bonds that were redeemed

[4] This amount includes $28.4 million of unrealized net holding gains arising during the period, which is then increased by $3.4 million of unrealized bond losses reclassified into operations.