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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mutual funds and common stock |  | $ 104,281 | $ 204,255
Loans held for sale |  | 409,152 | 367,221
Mortgage servicing rights |  | 228,099 | 243,389
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets-other, netting adjustment |  | (17,861) | (1,024)
Derivative liabilities, netting adjustment |  | 16,588 | 3,986
Mutual funds and common stock |  | 104,281 | 204,255
Loans held for sale |  | 409,152 | 367,221
Mortgage servicing rights |  | 228,099 | 243,389
Interest rate lock commitments |  | 982 | 2,526
Derivative assets-other | [1] | 1,579 | 2,193
Derivative liabilities |  | (7,140) | (336)
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 |  | 7,326 | 53,852
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 |  | 7,326 | 53,852
Fair Value, Measurements, Recurring | Other Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mutual funds and common stock |  | 96,955 | 150,403
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 | 795
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 |  | 7,243 | 6,964
Fair Value, Measurements, Recurring | Other Securities | Preferred stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mutual funds and common stock |  | 71,984 | 125,372
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 |  | 17,097 | 17,272
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 |  | 42,724 | 96,641
Derivative assets-other | [1] | 2,611 | 1,875
Derivative liabilities |  | (6,009) | (1,539)
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 |  | 42,724 | 96,641
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Securities | Preferred stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mutual funds and common stock |  | 42,724 | 96,641
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 |  | 61,557 | 107,614
Loans held for sale |  | 409,152 | 367,221
Derivative assets-other | [1] | 16,829 | 1,342
Derivative liabilities |  | (17,719) | (2,783)
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 |  | 7,326 | 53,852
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 |  | 7,326 | 53,852
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 |  | 54,231 | 53,762
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 | 795
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 |  | 7,243 | 6,964
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Preferred stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mutual funds and common stock |  | 29,260 | 28,731
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 |  | 17,097 | 17,272
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 | 243,389
Interest rate lock commitments |  | $ 982 | $ 2,526
[1] | Includes $1.9 million to purchase Treasury options.

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