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Rollforward of Financial Instruments Classified in Level Three of Valuation Hierarchy (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Available-for-sale capital securities
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning Balance $ 18,569  
Total Realized/Unrealized Gains/(Losses) Recorded in Comprehensive (Loss) Income 1,324  
Settlements     
Fair Value, Ending Balance 19,893  
Change in Unrealized Gains and (Losses) Related to Instruments Held 1,324  
Mortgage servicing rights
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning Balance 144,520 116,416
Total Realized/Unrealized Gains/(Losses) Recorded in (Loss) Income 15,766 (38,039)
Issuances 54,673 57,799
Settlements      
Fair Value, Ending Balance 214,959 136,176
Change in Unrealized Gains and (Losses) Related to Instruments Held 47,848 (38,039)
Interest rate lock commitments
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning Balance 21,446 15,633
Total Realized/Unrealized Gains/(Losses) Recorded in (Loss) Income (28,099) 13,964
Settlements      
Fair Value, Ending Balance (6,653) 29,597
Change in Unrealized Gains and (Losses) Related to Instruments Held (6,541) 13,964
Available-for-sale capital securities and preferred stock
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning Balance   18,078
Total Realized/Unrealized Gains/(Losses) Recorded in Comprehensive (Loss) Income   949
Settlements     
Transfers to/(from) level 3   (3,054)
Fair Value, Ending Balance   15,973
Change in Unrealized Gains and (Losses) Related to Instruments Held   $ 820