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Portion of Net Gains (Losses) Attributable to Level 3 Assets and Liabilities Still Held Included in Net Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Residential Loans at Fair Value
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net gains (losses) attributable to level 3 assets still held included in net income $ 11,755 $ (59,649) $ 11,964 $ (59,641)
Commercial Loans at Fair Value
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net gains (losses) attributable to level 3 assets still held included in net income 2,008   2,008  
Trading Securities
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net gains (losses) attributable to level 3 assets still held included in net income (9,257) 31,354 (13,688) 30,866
Available-for-sale Securities
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net gains (losses) attributable to level 3 assets still held included in net income (264) (1,642) (377) (1,665)
Mortgage Servicing Rights
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net gains (losses) attributable to level 3 assets still held included in net income (4,974) 9,450 (7,236) 9,532
Loan Purchase Commitments
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net gains (losses) attributable to level 3 liabilities still held included in net income 1,707   1,707  
Commercial Secured Borrowings
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net gains (losses) attributable to level 3 liabilities still held included in net income $ 1,759   $ 1,759