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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 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 |  | $ 50,224 |  | $ 104,281 |
Loans held for sale |  | 215,981 |  | 409,152 |
Mortgage servicing rights |  | 228,800 |  | 228,099 |
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative assets-other, netting adjustment | [2] | (2,892) | [1] | (17,861) | [3]
Derivative liabilities, netting adjustment | [2] | 2,531 |  | 16,588 |
Mutual funds and common stock |  | 50,224 |  | 104,281 |
Loans held for sale |  | 215,981 |  | 409,152 |
Mortgage servicing rights |  | 228,800 |  | 228,099 |
Interest rate lock commitments |  | 2,449 |  | 982 |
Derivative assets-other |  | 2,161 | [1] | 1,579 | [3]
Derivative liabilities |  | (6,390) |  | (7,140) |
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 |  | 7,303 |  | 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 |  | 7,303 |  | 7,326 |
Fair Value, Measurements, Recurring | Other Securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Mutual funds and common stock |  | 42,921 |  | 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 |  | 631 |  | 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 |  | 7,417 |  | 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 |  | 17,836 |  | 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 |  | 17,037 |  | 17,097 |
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 |  | 17,836 |  | 42,724 |
Derivative assets-other |  | 2,943 | [1] | 2,611 | [3]
Derivative liabilities |  | (6,433) |  | (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 |  | 17,836 |  | 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 |  | 17,836 |  | 42,724 |
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 |  | 32,388 |  | 61,557 |
Loans held for sale |  | 215,981 |  | 409,152 |
Derivative assets-other |  | 2,110 | [1] | 16,829 | [3]
Derivative liabilities |  | (2,488) |  | (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 |  | 7,303 |  | 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 |  | 7,303 |  | 7,326 |
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 |  | 25,085 |  | 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 |  | 631 |  | 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 |  | 7,417 |  | 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 |  | 17,037 |  | 17,097 |
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 |  | 228,800 |  | 228,099 |
Interest rate lock commitments |  | $ 2,449 |  | $ 982 |
[1] | Includes $2.1 million to purchase Treasury options.
[2] | Includes cash collateral received from, and paid to, counterparties.
[3] | Includes $1.9 million to purchase Treasury options.

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