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Fair Value Measurement (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
May. 31, 2015
Fair value of assets and liabilities          
Unrealized gains on securities $ (2,297) $ 1,644 $ 589 $ 5,246  
Derivative assets 104,535   104,535   $ 115,276
Derivative liabilities 688,998   688,998   408,382
Investment securities available for sale, at fair value 85,061   85,061   84,472
Deferred compensation investments 3,953   3,953   4,294
Investments in common and preferred stock 85,061   85,061   84,472
Level 1          
Fair value of assets and liabilities          
Deferred compensation investments 3,953   3,953   4,294
Level 2          
Fair value of assets and liabilities          
Derivative assets 104,535   104,535   115,276
Derivative liabilities 688,998   688,998   408,382
Recurring basis | Level 1          
Fair value of assets and liabilities          
Investment securities available for sale, at fair value 85,061   85,061   84,472
Deferred compensation investments 3,953   3,953   4,294
Non-recurring basis | Level 3          
Fair value of assets and liabilities          
Non-performing loans, net of specific reserves [1] 8,527   8,527   0
Total losses [1] (1,890) $ 0 (3,901) $ (943)  
Interest rate swaps          
Fair value of assets and liabilities          
Derivative assets 104,535   104,535    
Derivative liabilities 688,998   688,998    
Interest rate swaps | Level 2          
Fair value of assets and liabilities          
Derivative assets 104,535   104,535   115,276
Derivative liabilities 688,998   688,998   408,382
Fair value          
Fair value of assets and liabilities          
Derivative assets 104,535   104,535   115,276
Derivative liabilities $ 688,998   $ 688,998   $ 408,382
[1] Excludes impaired loans for which there is no specific allowance recorded.