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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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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.

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