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Securities - Summary of Portfolio of Securities Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | $ 5,743,929 | [1] | $ 5,841,796 | [2]
Gross Unrealized Gain |  | 130,677 | [1] | 77,498 | [2]
Gross Unrealized Loss |  | 29,697 | [1] | 33,407 | [2]
Fair Value |  | 5,844,909 | [1] | 5,885,887 | [2]
Asset-backed Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost | [3] | 530,226 |  | 384,108 |
Gross Unrealized Gain | [3] | 2,576 |  |  |
Gross Unrealized Loss | [3] | 5,703 |  | 10,854 |
Fair Value | [3] | 527,099 |  | 373,254 |
Mutual Funds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 15,814 |  |  |
Gross Unrealized Gain |  | 269 |  |  |
Fair Value |  | 16,083 |  |  |
Mutual Funds and Common Stock |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost | [4] |  |  | 16,871 |
Gross Unrealized Gain | [4] |  |  | 718 |
Gross Unrealized Loss | [4] |  |  | 173 |
Fair Value | [4] |  |  | 17,416 |
Mortgage-Related Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 2,942,332 |  | 3,313,757 |
Gross Unrealized Gain |  | 99,001 |  | 47,282 |
Gross Unrealized Loss |  | 3,008 |  | 7,304 |
Fair Value |  | 3,038,325 |  | 3,353,735 |
Mortgage-Related Securities | GSE Certificates |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 1,155,436 |  | 1,530,317 |
Gross Unrealized Gain |  | 54,310 |  | 26,069 |
Gross Unrealized Loss |  | 136 |  | 3,763 |
Fair Value |  | 1,209,610 |  | 1,552,623 |
Mortgage-Related Securities | GSE CMOs |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 1,786,896 |  | 1,783,440 |
Gross Unrealized Gain |  | 44,691 |  | 21,213 |
Gross Unrealized Loss |  | 2,872 |  | 3,541 |
Fair Value |  | 1,828,715 |  | 1,801,112 |
Debt Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 2,770,491 |  | 2,495,876 |
Gross Unrealized Gain |  | 31,206 |  | 29,376 |
Gross Unrealized Loss |  | 26,689 |  | 25,930 |
Fair Value |  | 2,775,008 |  | 2,499,322 |
Debt Securities | U. S. Treasury Obligations |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 64,984 |  | 41,820 |
Gross Unrealized Gain |  | 1 |  | 19 |
Fair Value |  | 64,985 |  | 41,839 |
Debt Securities | GSE Debentures |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 1,158,253 |  | 1,093,845 |
Gross Unrealized Gain |  | 3,998 |  | 5,707 |
Gross Unrealized Loss |  | 3,949 |  | 5,312 |
Fair Value |  | 1,158,302 |  | 1,094,240 |
Debt Securities | Municipal Bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 25,776 |  | 26,808 |
Gross Unrealized Gain |  | 625 |  | 559 |
Gross Unrealized Loss |  | 90 |  | 475 |
Fair Value |  | 26,311 |  | 26,892 |
Debt Securities | Corporate Bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 870,745 |  | 854,195 |
Gross Unrealized Gain |  | 17,928 |  | 15,970 |
Gross Unrealized Loss |  | 6,447 |  | 2,983 |
Fair Value |  | 882,226 |  | 867,182 |
Debt Securities | Foreign Notes |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 25,000 |  |  |
Gross Unrealized Gain |  | 538 |  |  |
Fair Value |  | 25,538 |  |  |
Debt Securities | Capital Trust Notes |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 95,507 |  | 95,100 |
Gross Unrealized Gain |  | 5,540 |  | 7,121 |
Gross Unrealized Loss |  | 10,500 |  | 6,306 |
Fair Value |  | 90,547 |  | 95,915 |
Mortgage Backed Securities And Other Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 5,712,823 |  | 5,809,633 |
Gross Unrealized Gain |  | 130,207 |  | 76,658 |
Gross Unrealized Loss |  | 29,697 |  | 33,234 |
Fair Value |  | 5,813,333 |  | 5,853,057 |
Equity Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 31,106 |  | 32,163 |
Gross Unrealized Gain |  | 470 |  | 840 |
Gross Unrealized Loss |  |  |  | 173 |
Fair Value |  | 31,576 |  | 32,830 |
Equity Securities | Preferred Stock |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 15,292 |  | 15,292 |
Gross Unrealized Gain |  | 201 |  | 122 |
Fair Value |  | $ 15,493 |  | $ 15,414 |
[1] | Excludes accrued interest receivable of $14.9 million included in other assets in the Consolidated Statements of Condition.
[2] | Excludes accrued interest receivable of $24.4 million included in other assets in the Consolidated Statements of Condition.
[3] | The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.
[4] | Primarily consists of mutual funds that are CRA-qualified investments.

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