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EARNINGS PER COMMON SHARE (DETAILS) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Mar. 31, 2015
Mar. 31, 2016
Basic earnings per common share        
Net income $ 48,386   $ 165,825  
Less: preferred share dividends 9,969   10,022  
Net income available to common shareholders $ 38,417   $ 155,803  
Weighted average common shares outstanding - basic 94,035,000   99,910,000  
Basic earnings per common share $ 0.41   $ 1.56  
Diluted earnings per common share        
Net income available to common shareholders $ 38,417   $ 155,803  
Weighted average common shares outstanding - basic 94,035,000   99,910,000  
Share based compensation plans 818,000   1,229,000  
Weighted average common shares outstanding - diluted 94,853,000   101,139,000  
Diluted earnings per common share $ 0.41   $ 1.54  
Anti-dilutive shares excluded from the dilutive computation 670,000   569,000  
August 17, 2015 ASR agreement [Member]        
Accelerated Share Repurchases [Line Items]        
Shares Repurchased 1,358,380 4,149,378   5,507,758