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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | $ 5,265,192,000 | [1] | $ 5,885,887,000
Total equity securities | 31,448,000 |  | 32,830,000
Total securities | 5,265,192,000 |  | 5,885,887,000
Asset-backed Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 532,253,000 | [2] | 373,254,000
Mutual Fund |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 16,157,000 |  |
Mutual Funds and Common Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  |  | 17,416,000
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 5,233,744 |  | 5,853,057
Total equity securities | 31,448 |  | 32,830
Total securities | 5,265,192 |  | 5,885,887
Fair Value, Measurements, Recurring | Preferred stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total equity securities | 15,291 |  | 15,414
Fair Value, Measurements, Recurring | Mutual Fund |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total equity securities | 16,157 |  |
Fair Value, Measurements, Recurring | Mutual Funds and Common Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total equity securities |  |  | 17,416
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 | 61,984 |  | 41,839
Total equity securities | 15,291 |  | 15,414
Total securities | 77,275 |  | 57,253
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 equity securities | 15,291 |  | 15,414
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 | 5,171,760 |  | 5,811,218
Total equity securities | 16,157 |  | 17,416
Total securities | 5,187,917 |  | 5,828,634
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mutual Fund |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total equity securities | 16,157 |  |
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 equity securities |  |  | 17,416
Fair Value, Measurements, Recurring | Mortgage-related Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 2,652,996 |  | 3,353,735
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 | 1,218,331 |  | 1,552,623
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 | 1,434,665 |  | 1,801,112
Fair Value, Measurements, Recurring | Mortgage-related Securities | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 2,652,996 |  | 3,353,735
Fair Value, Measurements, Recurring | Mortgage-related Securities | Significant Other Observable Inputs (Level 2) | GSE Certificates |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 1,218,331 |  | 1,552,623
Fair Value, Measurements, Recurring | Mortgage-related Securities | Significant Other Observable Inputs (Level 2) | GSE CMOs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 1,434,665 |  | 1,801,112
Fair Value, Measurements, Recurring | Other Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 2,580,748 |  | 2,499,322
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 | 61,984 |  | 41,839
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 | 993,965 |  | 1,094,240
Fair Value, Measurements, Recurring | Other Securities | Asset-backed Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 532,253 |  | 373,254
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 | 26,857 |  | 26,892
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 | 876,798 |  | 867,182
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 | 88,891 |  | 95,915
Fair Value, Measurements, Recurring | Other Securities | 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 | 61,984 |  | 41,839
Fair Value, Measurements, Recurring | Other Securities | 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] |  |  |
Securities available for sale | 61,984 |  | 41,839
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 2,518,764 |  | 2,457,483
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | GSE Debentures |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 993,965 |  | 1,094,240
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Asset-backed Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 532,253 |  | 373,254
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Municipal Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 26,857 |  | 26,892
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Corporate Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 876,798 |  | 867,182
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Capital Trust Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | $ 88,891 |  | $ 95,915
[1] | Excludes accrued interest receivable of $14.0 million included in other assets in the Consolidated Statements of Condition.
[2] | The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.

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