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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  | $ 3,531,427 | [1] | $ 104,281
Loans held for sale |  | 35,258 |  | 409,152
Mortgage servicing rights |  | 2,729 |  | 228,099
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  | 3,531,427 |  | 104,281
Loans held for sale |  | 35,258 |  | 409,152
Mortgage servicing rights |  | 2,729 |  | 228,099
Derivative assets-other, netting adjustment | [2],[3] |  |  | (17,861)
Derivative liabilities, netting adjustment | [3] |  |  | 16,588
Interest rate lock commitments |  |  |  | 982
Derivative assets-other | [2] |  |  | 1,579
Derivative liabilities |  |  |  | (7,140)
Fair Value, Measurements, Recurring | Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  | 2,618,746 |  | 7,326
Fair Value, Measurements, Recurring | Mortgage-Related Securities | GSE certificates |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  | 2,068,842 |  | 7,326
Fair Value, Measurements, Recurring | Mortgage-Related Securities | GSE CMOs |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  | 549,904 |  |
Fair Value, Measurements, Recurring | Other Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  | 912,681 |  | 96,955
Fair Value, Measurements, Recurring | Other Securities | U.S. Treasury obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  | 199,898 |  |
Fair Value, Measurements, Recurring | Other Securities | GSE debentures |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  | 473,258 |  |
Fair Value, Measurements, Recurring | Other Securities | Corporate bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  | 90,775 |  |
Fair Value, Measurements, Recurring | Other Securities | Municipal bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  | 70,120 |  | 631
Fair Value, Measurements, Recurring | Other Securities | Capital trust notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  | 46,096 |  | 7,243
Fair Value, Measurements, Recurring | Other Securities | Preferred stock |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  | 15,434 |  | 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] |  |  |  |
Securities available for sale |  | 17,100 |  | 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] |  |  |  |
Securities available for sale |  | 215,332 |  | 42,724
Derivative assets-other | [2] |  |  | 2,611
Derivative liabilities |  |  |  | (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] |  |  |  |
Securities available for sale |  | 215,332 |  | 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] |  |  |  |
Securities available for sale |  | 199,898 |  |
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] |  |  |  |
Securities available for sale |  | 15,434 |  | 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] |  |  |  |
Securities available for sale |  | 3,316,095 |  | 61,557
Loans held for sale |  | 35,258 |  | 409,152
Derivative assets-other | [2] |  |  | 16,829
Derivative liabilities |  |  |  | (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] |  |  |  |
Securities available for sale |  | 2,618,746 |  | 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] |  |  |  |
Securities available for sale |  | 2,068,842 |  | 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] |  |  |  |
Securities available for sale |  | 549,904 |  |
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] |  |  |  |
Securities available for sale |  | 697,349 |  | 54,231
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] |  |  |  |
Securities available for sale |  | 473,258 |  |
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] |  |  |  |
Securities available for sale |  | 90,775 |  |
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] |  |  |  |
Securities available for sale |  | 70,120 |  | 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] |  |  |  |
Securities available for sale |  | 46,096 |  | 7,243
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] |  |  |  |
Securities available for sale |  |  |  | 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] |  |  |  |
Securities available for sale |  | 17,100 |  | 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 |  | $ 2,729 |  | 228,099
Interest rate lock commitments |  |  |  | $ 982
[1] | The amortized cost includes the non-credit portion of OTTI recorded in AOCL. At December 31, 2017, the non-credit portion of OTTI recorded in AOCL was $8.6 million (before taxes).
[2] | Includes $1.9 million to purchase Treasury options.
[3] | Includes cash collateral received from, and paid to, counterparties.

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