STOCKHOLDERS' EQUITY (Details Textual) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended		6 Months Ended				12 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Preferred Class A [Member]	Jun. 30, 2012 Preferred Class A [Member] Minimum [Member]	Jun. 30, 2012 Preferred Class A [Member] Maximum [Member]	Jun. 30, 2012 Preferred Class B [Member] Minimum [Member]	Jun. 30, 2012 Preferred Class B [Member] Maximum [Member]	Dec. 31, 2008 Preferred Class C [Member] U.S. Treasury's Troubled Asset Relief Program's Capital Purchase Program [Member]	Dec. 31, 2008 Preferred Class D [Member] U.S. Treasury's Troubled Asset Relief Program's Capital Purchase Program [Member]	Jun. 30, 2012 Preferred Class C & D [Member]	Jun. 30, 2011 Preferred Class C & D [Member]	Jun. 30, 2012 Preferred Class C & D [Member]	Jun. 30, 2011 Preferred Class C & D [Member]	Dec. 31, 2011 Preferred Class C & D [Member]
Preferred stock, par value (in dollars per share)	$ 1		$ 1		$ 1						$ 1	$ 1
Percentage Of Preferred Stock Redeemed Par Value						105.00%
Preferred Stock, Dividend Rate, Percentage							6.00%	12.00%	7.00%	15.00%		9.00%
Preferred stock, shares issued	0		0		0						295,400	14,770
Preferred Stock, Liquidation Preference Per Share											$ 1,000	$ 1,000
Preferred Stock Dividend Rate Percentage One To Five Years											5.00%
Preferred Stock Dividend Rate Percentage Year Six and Thereafter											9.00%
Preferred Stock, Dividend Payment Terms											Class C Preferred Stock carries an annual dividend rate equal to 5% for the first five years and the annual dividend rate increases to 9% per annum on and after February 15, 2014, payable quarterly in arrears beginning February 15, 2009.	Class D Preferred Stock carries an annual dividend rate equal to 9%, payable quarterly in arrears beginning February 15, 2009
Preferred stock	$ 0		$ 0		$ 0						$ 295,400,000
Discount On Preferred Stock Accreted To Retained Earnings On Level Yield Basis															17,300,000
Accretion of discount on preferred stock	(883,000)	(864,000)	0	(1,719,000)	0								883,000	864,000	1,767,000	1,719,000
Dividends Payable-Regularly Scheduled Dividends Declared And Deferred													48,300,000		48,300,000		40,200,000
Dividends Payable-Additional Cumulative Dividends Declared and Deferred													4,100,000		4,100,000		2,800,000
Gross Unrealized Gain on Reclassification of Available For Sale Securities to Held To Maturity Securities	11,700,000		11,700,000
Gross Unrealized Gain, net of taxes, on Reclassification of Available For Sale Securities to Held To Maturity Securities	7,600,000		7,600,000
Deferred Tax Liability Associated with Gross Unrealized Gain on Reclassification of Available For Sale Securities to Held To Maturity Securities	4,100,000		4,100,000
Reclassification of investment securities from available for sale to held to maturity	$ 729,142,000	$ 0	$ 729,142,000	$ 0