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v3.20.1

Summary of Portfolio of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | $ 5,461,502 | [1] | $ 5,841,796 | [2]
Gross Unrealized Gain |  | 146,332 | [1] | 77,498 | [2]
Gross Unrealized Loss |  | 119,973 | [1] | 33,407 | [2]
Fair Value |  | 5,487,861 | [1] | 5,885,887 | [2]
Mutual Funds and Common Stock |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost | [3] | 16,871 |  | 16,871 |
Gross Unrealized Gain | [3] | 904 |  | 718 |
Gross Unrealized Loss | [3] |  |  | 173 |
Fair Value | [3] | 17,775 |  | 17,416 |
Asset-backed Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost | [4] | 383,289 |  | 384,108 |
Gross Unrealized Loss | [4] | 27,906 |  | 10,854 |
Fair Value | [4] | 355,383 |  | 373,254 |
Mortgage-related Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 3,290,467 |  | 3,313,757 |
Gross Unrealized Gain |  | 122,890 |  | 47,282 |
Gross Unrealized Loss |  | 5,815 |  | 7,304 |
Fair Value |  | 3,407,542 |  | 3,353,735 |
Mortgage-related Securities | GSE certificates |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 1,421,081 |  | 1,530,317 |
Gross Unrealized Gain |  | 72,190 |  | 26,069 |
Gross Unrealized Loss |  | 2 |  | 3,763 |
Fair Value |  | 1,493,269 |  | 1,552,623 |
Mortgage-related Securities | GSE CMOs |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 1,869,386 |  | 1,783,440 |
Gross Unrealized Gain |  | 50,700 |  | 21,213 |
Gross Unrealized Loss |  | 5,813 |  | 3,541 |
Fair Value |  | 1,914,273 |  | 1,801,112 |
Equity Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 32,163 |  | 32,163 |
Gross Unrealized Gain |  | 904 |  | 840 |
Gross Unrealized Loss |  | 451 |  | 173 |
Fair Value |  | 32,616 |  | 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 |  | 451 |  |  |
Fair Value |  | 14,841 |  | 15,414 |
Debt Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 2,138,872 |  | 2,495,876 |
Gross Unrealized Gain |  | 22,538 |  | 29,376 |
Gross Unrealized Loss |  | 113,707 |  | 25,930 |
Fair Value |  | 2,047,703 |  | 2,499,322 |
Debt Securities | U.S. Treasury obligations |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 61,812 |  | 41,820 |
Gross Unrealized Gain |  | 172 |  | 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 |  | 717,495 |  | 1,093,845 |
Gross Unrealized Gain |  | 7,737 |  | 5,707 |
Gross Unrealized Loss |  |  |  | 5,312 |
Fair Value |  | 725,232 |  | 1,094,240 |
Debt Securities | Corporate bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 854,336 |  | 854,195 |
Gross Unrealized Gain |  | 8,874 |  | 15,970 |
Gross Unrealized Loss |  | 70,376 |  | 2,983 |
Fair Value |  | 792,834 |  | 867,182 |
Debt Securities | Municipal bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 26,745 |  | 26,808 |
Gross Unrealized Gain |  | 615 |  | 559 |
Gross Unrealized Loss |  | 614 |  | 475 |
Fair Value |  | 26,746 |  | 26,892 |
Debt Securities | Capital trust notes |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 95,195 |  | 95,100 |
Gross Unrealized Gain |  | 5,140 |  | 7,121 |
Gross Unrealized Loss |  | 14,808 |  | 6,306 |
Fair Value |  | 85,527 |  | 95,915 |
Mortgage Backed Securities And Other Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 5,429,339 |  | 5,809,633 |
Gross Unrealized Gain |  | 145,428 |  | 76,658 |
Gross Unrealized Loss |  | 119,522 |  | 33,234 |
Fair Value |  | $ 5,455,245 |  | $ 5,853,057 |
[1] | Excludes accrued interest receivable of $20.6 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] | Primarily consists of mutual funds that are CRA-qualified investments.
[4] | The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.

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