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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | $ 3,391,952 |  | $ 3,531,427 | [1]
Total securities | 3,424,021 |  | 3,531,427 |
Loans held for sale | 31,402 |  | 35,258 |
Mortgage servicing rights | 2,575 |  | 2,729 |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 3,391,952 |  | 3,531,427 |
Total securities | 3,424,021 |  |  |
Loans held for sale | 31,402 |  | 35,258 |
Mortgage servicing rights | 2,575 |  | 2,729 |
Fair Value, Measurements, Recurring | Mortgage-Related Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 2,512,764 |  | 2,618,746 |
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 | 1,971,177 |  | 2,068,842 |
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 | 541,587 |  | 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 | 879,188 |  | 912,681 |
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 | 199,430 |  | 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 | 473,069 |  | 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 | 89,718 |  | 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 | 68,607 |  | 70,120 |
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 | 48,364 |  | 46,096 |
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 |
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 |
Fair Value, Measurements, Recurring | Equity securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 32,069 |  |  |
Fair Value, Measurements, Recurring | Equity securities | Preferred stock |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 15,243 |  |  |
Fair Value, Measurements, Recurring | Equity securities | Mutual Funds and Common Stock |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 16,826 |  |  |
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 | 199,430 |  | 215,332 |
Total securities | 214,673 |  |  |
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 | 199,430 |  | 215,332 |
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 | 199,430 |  | 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 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 15,243 |  |  |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities | Preferred stock |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 15,243 |  |  |
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 | 3,192,522 |  | 3,316,095 |
Total securities | 3,209,348 |  |  |
Loans held for sale | 31,402 |  | 35,258 |
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 | 2,512,764 |  | 2,618,746 |
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 | 1,971,177 |  | 2,068,842 |
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 | 541,587 |  | 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 | 679,758 |  | 697,349 |
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 | 473,069 |  | 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 | 89,718 |  | 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 | 68,607 |  | 70,120 |
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 | 48,364 |  | 46,096 |
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 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 16,826 |  |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity securities | Mutual Funds and Common Stock |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 16,826 |  |  |
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 | $ 2,575 | [2] | $ 2,729 |
[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 cash collateral received from, and paid to, counterparties.

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