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EARNINGS PER COMMON SHARE (DETAILS) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended
Jan. 15, 2016
Aug. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jan. 15, 2016
Sep. 30, 2016
Sep. 30, 2015
Basic earnings per common share              
Net income     $ 186,613 $ 257,642   $ 364,460 $ 496,838
Less: preferred share dividends     9,969 10,022   29,906 30,066
Net income available to common shareholders     $ 176,644 $ 247,620   $ 334,554 $ 466,772
Weighted average number of common shares outstanding - basic (in shares)     89,621,000 98,226,000   91,852,000 99,464,000
Basic earnings per common share (in usd per share)     $ 1.97 $ 2.52   $ 3.64 $ 4.69
Diluted earnings per common share              
Net income available to common shareholders     $ 176,644 $ 247,620   $ 334,554 $ 466,772
Weighted average number of common shares outstanding - basic (in shares)     89,621,000 98,226,000   91,852,000 99,464,000
Share based compensation plans (in shares)     730,000 898,000   727,000 1,004,000
Weighted average number of common shares outstanding - diluted (in shares)     90,351,000 99,124,000   92,579,000 100,468,000
Diluted earnings per common share (in usd per share)     $ 1.96 $ 2.50   $ 3.61 $ 4.65
Anti-dilutive shares excluded from the dilutive computation (in shares)     0 0   226,000 219,000
August 17, 2015 ASR agreement [Member]              
Accelerated Share Repurchases [Line Items]              
Shares repurchased (in shares) 1,358,380.00 4,149,378   4,149,378 5,507,758 1,358,380