EARNINGS PER COMMON SHARE (DETAILS) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Basic earnings per common share
Net income									$ 727,465	$ 547,241	$ 46,305
Less: preferred share dividends									40,474	38,228	36,875
Less: loss on repurchase of preferred shares									3,081	14,009	0
Net income available to common shareholders	171,524	137,121	72,447	302,816	(18,551)	223,407	168,152	121,997	683,910	495,004	9,430
Weighted average number of common shares outstanding - basic									113,636	122,148	122,499
Basic earnings per common share	$ 1.55	$ 1.23	$ 0.63	$ 2.59	$ (0.16)	$ 1.84	$ 1.36	$ 0.97	$ 6.02	$ 4.05	$ 0.08
Diluted earnings per common share
Net income available to common shareholders	$ 171,524	$ 137,121	$ 72,447	$ 302,816	$ (18,551)	$ 223,407	$ 168,152	$ 121,997	$ 683,910	$ 495,004	$ 9,430
Weighted average number of common shares outstanding - basic									113,636	122,148	122,499
Warrants									0	0	4,292
Stock compensation plans									1,692	1,506	1,331
Weighted average number of common shares outstanding - diluted									115,328	123,654	128,122
Diluted earnings per common share	$ 1.52	$ 1.21	$ 0.62	$ 2.55	$ (0.16)	$ 1.82	$ 1.35	$ 0.96	$ 5.93	$ 4.00	$ 0.07
Anti-dilutive shares excluded from the dilutive computation									250	614	1,134