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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, 2014
Jun. 30, 2013
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
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 241,018 144,520
Total Realized/Unrealized Gains/(Losses) Recorded in (Loss) Income (26,186) 15,766
Issuances 13,983 54,673
Fair Value, Ending Balance 228,815 214,959
Change in Unrealized Gains and (Losses) Related to Instruments Held (492) 47,848
Interest rate lock commitments
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning Balance 258 21,446
Total Realized/Unrealized Gains/(Losses) Recorded in (Loss) Income 3,634 (28,099)
Fair Value, Ending Balance 3,892 (6,653)
Change in Unrealized Gains and (Losses) Related to Instruments Held $ 3,892 $ (6,541)