STOCKHOLDERS' EQUITY (Details Textual) (USD $)	12 Months Ended					12 Months Ended									0 Months Ended			12 Months Ended
	Dec. 31, 2012 class quarters	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2012	Dec. 31, 2012 Preferred Class A	Dec. 31, 2012 Preferred Class A Minimum	Dec. 31, 2012 Preferred Class A Maximum	Dec. 31, 2012 Preferred Class B Minimum	Dec. 31, 2012 Preferred Class B Maximum	Dec. 31, 2012 Preferred Class C	Dec. 31, 2011 Preferred Class C	Dec. 31, 2010 Preferred Class C	Dec. 31, 2008 Preferred Class C U.S. Treasury's Troubled Asset Relief Program's Capital Purchase Program	Dec. 31, 2008 Preferred Class D U.S. Treasury's Troubled Asset Relief Program's Capital Purchase Program	Jun. 13, 2011 Preferred Class C & D [Member] directors	Dec. 31, 2008 Preferred Class C & D [Member] U.S. Treasury's Troubled Asset Relief Program's Capital Purchase Program	Dec. 31, 2011 Preferred Class C & D [Member] Minimum quarters	Dec. 31, 2012 Accumulated Other Comprehensive Income (Loss)	Dec. 31, 2011 Accumulated Other Comprehensive Income (Loss)	Dec. 31, 2010 Accumulated Other Comprehensive Income (Loss)	Dec. 31, 2008 First five years Preferred Class C U.S. Treasury's Troubled Asset Relief Program's Capital Purchase Program	Dec. 31, 2008 On or after February 15, 2014 Preferred Class C U.S. Treasury's Troubled Asset Relief Program's Capital Purchase Program	Dec. 31, 2012 Regularly scheduled dividend payments Preferred Class C & D [Member]	Dec. 31, 2011 Regularly scheduled dividend payments Preferred Class C & D [Member]	Dec. 31, 2012 Cumulative dividends on unpaid regular dividends Preferred Class C & D [Member]	Dec. 31, 2011 Cumulative dividends on unpaid regular dividends Preferred Class C & D [Member]
Class of Stock [Line Items]
Number of classes of preferred stock	4
Redemption price, percentage of par value					105.00%
Preferred stock, percentage dividend rate						6.00%	12.00%	7.00%	15.00%					9.00%							5.00%	9.00%
Preferred stock, par value (in dollars per share)													$ 1.00	$ 1.00
Preferred stock, shares issued													295,400	14,770
Preferred stock, liquidation preference (in dollars per share)													$ 1,000	$ 1,000
Preferred stock dividend rate period										5 years
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
Dividend deferral, conferral of right to elect directors (number of directors)															2
Dividend deferral, number of directors elected															2
Preferred stock																$ 295,400,000
Discount on issuance of preferred stock										17,300,000
Preferred stock discount, accretion period										5 years
Number of quarterly periods that dividends have been deferred on preferred stock	14																6
Accretion of discount on preferred stock										3,554,000	3,466,000	3,381,000
Dividends declared and deferred																							56,300,000	40,200,000	5,600,000	2,800,000
Reclassification of investment securities from available for sale to held to maturity	729,142,000	0	0	729,100,000
Gross unrealized gain on securities reclassified from available-for-sale to held-to-maturity				11,700,000
Gross unrealized gain on reclassification, net of taxes				6,800,000
Tax effect of reclassification adjustment				4,900,000
Other comprehensive income	29,193,000	18,384,000	146,000															29,193,000	18,384,000	146,000
Other comprehensive income, tax	$ 8,000,000	$ 10,100,000	$ (2,300,000)