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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock $ 3,171,117 [1] $ 104,281
Loans held for sale 266,888 409,152
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets-other, netting adjustment [3] (2,402) [2] (17,861) [4]
Derivative liabilities, netting adjustment [3] 1,702 16,588
Mutual funds and common stock 3,171,117 104,281
Loans held for sale 266,888 409,152
Mortgage servicing rights   228,099
Interest rate lock commitments 1,027 982
Derivative assets-other 1,350 [2] 1,579 [4]
Derivative liabilities (4,211) (7,140)
Fair Value, Measurements, Recurring | Covered loans held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights 220,586  
Fair Value, Measurements, Recurring | Mortgage-Related Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 2,624,248 7,326
Fair Value, Measurements, Recurring | Mortgage-Related Securities | GSE certificates    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 2,002,643 7,326
Fair Value, Measurements, Recurring | Mortgage-Related Securities | GSE CMOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 621,605  
Fair Value, Measurements, Recurring | Other Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 546,869 96,955
Fair Value, Measurements, Recurring | Other Securities | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 70,513 631
Fair Value, Measurements, Recurring | Other Securities | Capital trust notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 66,425 7,243
Fair Value, Measurements, Recurring | Other Securities | Preferred Stock (Par Value: $0.01):    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 15,435 71,984
Fair Value, Measurements, Recurring | Other Securities | Mutual Funds and Common Stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 17,150 17,097
Fair Value, Measurements, Recurring | Other Securities | U.S. Treasury obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 199,992  
Fair Value, Measurements, Recurring | Other Securities | GSE debentures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 91,234  
Fair Value, Measurements, Recurring | Other Securities | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 86,120  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 215,427 42,724
Derivative assets-other 1,914 [2] 2,611 [4]
Derivative liabilities (4,641) (6,009)
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 215,427 42,724
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Securities | Preferred Stock (Par Value: $0.01):    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 15,435 42,724
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Securities | U.S. Treasury obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 199,992  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 2,955,690 61,557
Loans held for sale 266,888 409,152
Derivative assets-other 1,838 [2] 16,829 [4]
Derivative liabilities (1,272) (17,719)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Related Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 2,624,248 7,326
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Related Securities | GSE certificates    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 2,002,643 7,326
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Related Securities | GSE CMOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 621,605  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 331,442 54,231
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 70,513 631
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Capital trust notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 66,425 7,243
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Preferred Stock (Par Value: $0.01):    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock   29,260
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Mutual Funds and Common Stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 17,150 17,097
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | GSE debentures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 91,234  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 86,120  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights   228,099
Interest rate lock commitments 1,027 $ 982
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Covered loans held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights $ 220,586  
[1] The amortized cost includes the non-credit portion of OTTI recorded in AOCL. At June 30, 2017, the non-credit portion of OTTI recorded in AOCL was $8.6 million (before taxes).
[2] Includes $1.1 million to purchase Treasury options.
[3] Includes cash collateral received from, and paid to, counterparties.
[4] Includes $1.9 million to purchase Treasury options.