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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | Jun. 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 | $ 5,201,700,000 | [1] | $ 5,885,887,000
Total equity securities | 33,518,000 |  | 32,830,000
Total securities | 5,201,700,000 |  | 5,885,887,000
Asset-backed Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 421,393,000 | [2] | 373,254,000
Mutual Funds and Common Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 18,329,000 | [3] | 17,416,000
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 5,168,182 |  | 5,853,057
Total equity securities | 33,518 |  | 32,830
Total securities | 5,201,700 |  | 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 | 15,189 |  | 15,414
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 | 18,329 |  | 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 | 61,981 |  | 41,839
Total equity securities | 15,189 |  | 15,414
Total securities | 77,170 |  | 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 | 15,189 |  | 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 | 5,106,201 |  | 5,811,218
Total equity securities | 18,329 |  | 17,416
Total securities | 5,124,530 |  | 5,828,634
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 | 18,329 |  | 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 | 3,026,952 |  | 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 | 1,357,515 |  | 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 | 1,669,437 |  | 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 | 3,026,952 |  | 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 | 1,357,515 |  | 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 | 1,669,437 |  | 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 | 2,141,230 |  | 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 | 61,981 |  | 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 | 678,540 |  | 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 | 421,393 |  | 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 | 26,910 |  | 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 | 866,825 |  | 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 | 85,581 |  | 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 | 61,981 |  | 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 | 61,981 |  | 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 | 2,079,249 |  | 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 | 678,540 |  | 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 | 421,393 |  | 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 | 26,910 |  | 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 | 866,825 |  | 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 | $ 85,581 |  | $ 95,915
[1] | Excludes accrued interest receivable of $16.5 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.
[3] | Primarily consists of mutual funds that are CRA-qualified investments.

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