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Summary of Portfolio of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | $ 5,826,222 |  | $ 5,660,418 |
Gross Unrealized Gain |  | 88,859 |  | 46,339 |
Gross Unrealized Loss |  | 27,652 |  | 62,686 |
Fair Value |  | 5,887,429 |  | 5,644,071 |
Mortgage-related Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 3,283,394 |  | 2,953,957 |
Gross Unrealized Gain |  | 60,376 |  | 26,526 |
Gross Unrealized Loss |  | 2,091 |  | 20,201 |
Fair Value |  | 3,341,679 |  | 2,960,282 |
Mortgage-related Securities | GSE certificates |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 1,538,922 |  | 1,705,336 |
Gross Unrealized Gain |  | 34,377 |  | 18,146 |
Gross Unrealized Loss |  | 394 |  | 15,961 |
Fair Value |  | 1,572,905 |  | 1,707,521 |
Mortgage-related Securities | GSE CMOs |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 1,744,472 |  | 1,248,621 |
Gross Unrealized Gain |  | 25,999 |  | 8,380 |
Gross Unrealized Loss |  | 1,697 |  | 4,240 |
Fair Value |  | 1,768,774 |  | 1,252,761 |
Equity Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 32,163 |  | 32,162 |
Gross Unrealized Gain |  | 816 |  | 366 |
Gross Unrealized Loss |  | 118 |  | 1,977 |
Fair Value |  | 32,861 |  | 30,551 |
Equity Securities [Member] | Preferred stock |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 15,292 |  | 15,292 |
Gross Unrealized Gain |  | 81 |  |  |
Gross Unrealized Loss |  |  |  | 1,446 |
Fair Value |  | 15,373 |  | 13,846 |
Equity Securities [Member] | Mutual Funds and Common Stock |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost | [1] | 16,871 |  | 16,870 |
Gross Unrealized Gain | [1] | 735 |  | 366 |
Gross Unrealized Loss | [1] | 118 |  | 531 |
Fair Value | [1] | 17,488 |  | 16,705 |
Debt Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 2,510,665 |  | 2,674,299 |
Gross Unrealized Gain |  | 27,667 |  | 19,447 |
Gross Unrealized Loss |  | 25,443 |  | 40,508 |
Fair Value |  | 2,512,889 |  | 2,653,238 |
Debt Securities [Member] | U.S. Treasury obligations |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 29,763 |  |  |
Gross Unrealized Gain |  | 6 |  |  |
Fair Value |  | 29,769 |  |  |
Debt Securities [Member] | GSE debentures |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 1,137,235 |  | 1,334,549 |
Gross Unrealized Gain |  | 7,231 |  | 3,366 |
Gross Unrealized Loss |  | 2,003 |  | 8,988 |
Fair Value |  | 1,142,463 |  | 1,328,927 |
Debt Securities [Member] | Corporate bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 836,558 |  | 836,153 |
Gross Unrealized Gain |  | 13,333 |  | 8,667 |
Gross Unrealized Loss |  | 9,877 |  | 23,105 |
Fair Value |  | 840,014 |  | 821,715 |
Debt Securities [Member] | Municipal bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 27,319 |  | 68,551 |
Gross Unrealized Gain |  | 620 |  | 195 |
Gross Unrealized Loss |  | 382 |  | 2,563 |
Fair Value |  | 27,557 |  | 66,183 |
Debt Securities [Member] | Capital trust notes |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 95,006 |  | 48,278 |
Gross Unrealized Gain |  | 6,477 |  | 6,435 |
Gross Unrealized Loss |  | 6,653 |  | 5,422 |
Fair Value |  | 94,830 |  | 49,291 |
Debt Securities [Member] | Asset-backed Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost | [2] | 384,784 |  | 386,768 |
Gross Unrealized Gain | [2] |  |  | 784 |
Gross Unrealized Loss | [2] | 6,528 |  | 430 |
Fair Value | [2] | 378,256 |  | 387,122 |
Mortgage Backed Securities And Other Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 5,794,059 | [3] | 5,628,256 | [4]
Gross Unrealized Gain |  | 88,043 | [3] | 45,973 | [4]
Gross Unrealized Loss |  | 27,534 | [3] | 60,709 | [4]
Fair Value |  | $ 5,854,568 | [3] | $ 5,613,520 | [4]
[1] | Primarily consists of mutual funds that are CRA-qualified investments.
[2] | The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.
[3] | The amortized cost includes the non-credit portion of OTTI recorded in AOCL. At September 30, 2019, the non-credit portion of OTTI recorded in AOCL was $8.6 million before taxes.
[4] | The amortized cost includes the non-credit portion of OTTI recorded in AOCL. At December 31, 2018, the non-credit portion of OTTI recorded in AOCL was $8.6 million before taxes.

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