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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | $ 4,122,883,000 | [1] | $ 3,531,427,000
Total equity securities | 31,766,000 |  |
Total securities | 4,154,649,000 |  | 3,531,427,000
Mortgage servicing rights | 2,505,000 |  | 2,729,000
Loans held for sale | 0 |  | 35,258,000
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 4,122,883,000 |  | 3,531,427,000
Total equity securities | 31,766,000 |  |
Total securities | 4,154,649,000 |  |
Mortgage servicing rights | 2,505,000 |  | 2,729,000
Loans held for sale |  |  | 35,258,000
Fair Value, Measurements, Recurring | Preferred stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale |  |  | 15,434,000
Total equity securities | 15,108,000 |  |
Fair Value, Measurements, Recurring | Mutual Funds and Common Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale |  |  | 17,100,000
Total equity securities | 16,658,000 |  |
Fair Value, Measurements, Recurring | GSE certificates |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 1,923,416,000 |  | 2,068,842,000
Fair Value, Measurements, Recurring | GSE CMOs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 659,772,000 |  | 549,904,000
Fair Value, Measurements, Recurring | Mortgage-Related Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 2,583,188,000 |  | 2,618,746,000
Fair Value, Measurements, Recurring | U.S. Treasury obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 199,696,000 |  | 199,898,000
Fair Value, Measurements, Recurring | GSE debentures |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 554,649,000 |  | 473,258,000
Fair Value, Measurements, Recurring | Asset backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 280,798,000 |  |
Fair Value, Measurements, Recurring | Municipal bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 67,605,000 |  | 70,120,000
Fair Value, Measurements, Recurring | Corporate bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 388,093,000 |  | 90,775,000
Fair Value, Measurements, Recurring | Capital trust notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 48,854,000 |  | 46,096,000
Fair Value, Measurements, Recurring | Other Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale |  |  | 912,681,000
Fair Value, Measurements, Recurring | Debt Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 1,539,695,000 |  |
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] |  |  |
Total securities available for sale | 199,696,000 |  | 215,332,000
Total equity securities | 15,108,000 |  |
Total securities | 214,804,000 |  |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Preferred stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale |  |  | 15,434,000
Total equity securities | 15,108,000 |  |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 199,696,000 |  | 199,898,000
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] |  |  |
Total securities available for sale |  |  | 215,332,000
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Debt Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 199,696,000 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 3,923,187,000 |  | 3,316,095,000
Total equity securities | 16,658,000 |  |
Total securities | 3,939,845,000 |  |
Loans held for sale |  |  | 35,258,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mutual Funds and Common Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale |  |  | 17,100,000
Total equity securities | 16,658,000 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | GSE certificates |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 1,923,416,000 |  | 2,068,842,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | GSE CMOs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 659,772,000 |  | 549,904,000
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] |  |  |
Total securities available for sale | 2,583,188,000 |  | 2,618,746,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | GSE debentures |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 554,649,000 |  | 473,258,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 280,798,000 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 67,605,000 |  | 70,120,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 388,093,000 |  | 90,775,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Capital trust notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 48,854,000 |  | 46,096,000
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] |  |  |
Total securities available for sale |  |  | 697,349,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total securities available for sale | 1,339,999,000 |  |
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 | $ 2,505,000 |  | $ 2,729,000
[1] | As equity securities have no contractual maturity, they have been excluded from this table.

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