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Securities - Summary of Portfolio of Securities Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | $ 5,100,223 | [1] | $ 5,841,796
Gross Unrealized Gain |  | 151,470 | [1] | 77,498
Gross Unrealized Loss |  | 49,993 | [1] | 33,407
Fair Value |  | 5,201,700 | [1] | 5,885,887
Asset-backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 440,261 | [2] | 384,108
Gross Unrealized Gain | [2] | 94 |  |
Gross Unrealized Loss |  | 18,962 | [2] | 10,854
Fair Value |  | 421,393 | [2] | 373,254
Mutual Funds and Common Stock |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 16,871 | [3] | 16,871
Gross Unrealized Gain |  | 1,458 | [3] | 718
Gross Unrealized Loss |  |  |  | 173
Fair Value |  | 18,329 | [3] | 17,416
Mortgage-related Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 2,901,629 |  | 3,313,757
Gross Unrealized Gain |  | 126,206 |  | 47,282
Gross Unrealized Loss |  | 883 |  | 7,304
Fair Value |  | 3,026,952 |  | 3,353,735
Mortgage-related Securities | GSE Certificates |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 1,288,192 |  | 1,530,317
Gross Unrealized Gain |  | 69,358 |  | 26,069
Gross Unrealized Loss |  | 35 |  | 3,763
Fair Value |  | 1,357,515 |  | 1,552,623
Mortgage-related Securities | GSE CMOs |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 1,613,437 |  | 1,783,440
Gross Unrealized Gain |  | 56,848 |  | 21,213
Gross Unrealized Loss |  | 848 |  | 3,541
Fair Value |  | 1,669,437 |  | 1,801,112
Debt Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 2,166,431 |  | 2,495,876
Gross Unrealized Gain |  | 23,806 |  | 29,376
Gross Unrealized Loss |  | 49,007 |  | 25,930
Fair Value |  | 2,141,230 |  | 2,499,322
Debt Securities | U.S. Treasury Obligations |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 61,938 |  | 41,820
Gross Unrealized Gain |  | 46 |  | 19
Gross Unrealized Loss |  | 3 |  |
Fair Value |  | 61,981 |  | 41,839
Debt Securities | GSE Debentures |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 672,101 |  | 1,093,845
Gross Unrealized Gain |  | 6,439 |  | 5,707
Gross Unrealized Loss |  |  |  | 5,312
Fair Value |  | 678,540 |  | 1,094,240
Debt Securities | Municipal Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 26,366 |  | 26,808
Gross Unrealized Gain |  | 729 |  | 559
Gross Unrealized Loss |  | 185 |  | 475
Fair Value |  | 26,910 |  | 26,892
Debt Securities | Corporate Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 870,475 |  | 854,195
Gross Unrealized Gain |  | 11,434 |  | 15,970
Gross Unrealized Loss |  | 15,084 |  | 2,983
Fair Value |  | 866,825 |  | 867,182
Debt Securities | Capital Trust Notes |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 95,290 |  | 95,100
Gross Unrealized Gain |  | 5,064 |  | 7,121
Gross Unrealized Loss |  | 14,773 |  | 6,306
Fair Value |  | 85,581 |  | 95,915
Mortgage Backed Securities And Other Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 5,068,060 |  | 5,809,633
Gross Unrealized Gain |  | 150,012 |  | 76,658
Gross Unrealized Loss |  | 49,890 |  | 33,234
Fair Value |  | 5,168,182 |  | 5,853,057
Equity Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 32,163 |  | 32,163
Gross Unrealized Gain |  | 1,458 |  | 840
Gross Unrealized Loss |  | 103 |  | 173
Fair Value |  | 33,518 |  | 32,830
Equity Securities | Preferred stock |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  | 15,292 |  | 15,292
Gross Unrealized Gain |  |  |  | 122
Gross Unrealized Loss |  | 103 |  |
Fair Value |  | $ 15,189 |  | $ 15,414
[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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