FAIR VALUE MEASUREMENTS (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Derivative Financial Instruments, Liabilities [Member]
Derivative Liabilities, Beginning Balance	$ (1,006)		$ (1,045)		$ (1,067)		$ (558)
Derivative Liabilities, Net losses included in earnings	312		(147)		227		(153)
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	(694)		(1,192)		(694)		(1,192)
Available-for-sale Securities [Member]
Bonds Available-for-Sale, Beginning Balance	968,814		1,016,442		969,394		1,021,628
Bonds Available-for-Sale , Net losses included in earnings	(1,417)		(1,752)		(3,268)		(3,024)
Bonds Available-for-Sale, Net gains (losses) included in other comprehensive lncome	(22,298)	[1]	9,505	[2]	(11,299)	[3]	16,720	[4]
Bonds Available-for Sale, Impact from purchases			5,600				6,189
Bonds Available-for Sale, Impact from sales/redemptions	(1,638)		(8,172)		(6,033)		(8,172)
Bonds Available-for Sale, Bonds eliminated due to real estate consolidation and foreclosure	(45,106)		(12,562)		(45,106)		(12,562)
Bonds Available-for Sale, Impact from settlements	(2,033)		(2,522)		(7,366)		(14,240)
Bonds Available-for Sale, Transfer into Level 3							0
Bonds Available-for-Sale, Ending Balance	$ 896,322		$ 1,006,539		$ 896,322		$ 1,006,539

[1] This amount includes $22.4 million of unrealized net holding losses arising during the period, which is then reduced by $0.5 million of unrealized bond losses reclassified into operations. This amount is then increased by $0.4 million of unrealized gains related to bonds that were redeemed.

[2] This amount includes $8.7 million of unrealized net holding gains arising during the period, which is then increased by $0.8 million of unrealized bond losses reclassified into operations.

[3] This amount includes $11.5 million of unrealized net holding losses arising during the period, which is then reduced by $0.8 million of unrealized bond losses reclassified into operations. This amount is then increased by $0.6 million of unrealized gains related to bonds that were redeemed.

[4] This amount includes $15.7 million of unrealized net holding gains arising during the period, which is then increased by $1.0 million of unrealized bond losses reclassified into operations.