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v3.25.4

Investment Securities - Summary of Gross Unrealized Losses and Fair Value of Available-for-Sale Securities (Detail) $ in Thousands | Dec. 31, 2025 USD ($) holding | Dec. 31, 2024 USD ($) holding
--- | --- | ---
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | $ 729,099 | $ 4,094,196
Less Than 12 Months, Unrealized Losses | (11,381) | (64,068)
12 Months or More, Fair Value | 4,336,787 | 4,043,216
12 Months or More, Unrealized Losses | $ (537,639) | $ (661,832)
Total, Number of Holdings | holding | 623 | 751
Total, Fair Value | $ 5,065,886 | $ 8,137,412
Total, Unrealized Losses | (549,020) | (725,900)
Government agency debentures |  |
Schedule of Investments [Line Items] |  |
12 Months or More, Fair Value | 197,650 | 186,427
12 Months or More, Unrealized Losses | $ (25,198) | $ (36,341)
Total, Number of Holdings | holding | 15 | 15
Total, Fair Value | $ 197,650 | $ 186,427
Total, Unrealized Losses | (25,198) | (36,341)
Municipal bonds and notes |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value |  | 859
Less Than 12 Months, Unrealized Losses |  | (1)
12 Months or More, Fair Value | 108,944 | 108,013
12 Months or More, Unrealized Losses | $ (7,131) | $ (13,010)
Total, Number of Holdings | holding | 36 | 57
Total, Fair Value | $ 108,944 | $ 108,872
Total, Unrealized Losses | (7,131) | (13,011)
Agency CMO |  |
Schedule of Investments [Line Items] |  |
12 Months or More, Fair Value | 24,856 | 29,043
12 Months or More, Unrealized Losses | $ (1,960) | $ (3,150)
Total, Number of Holdings | holding | 25 | 28
Total, Fair Value | $ 24,856 | $ 29,043
Total, Unrealized Losses | (1,960) | (3,150)
Agency MBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 15,368 | 2,624,722
Less Than 12 Months, Unrealized Losses | (22) | (31,539)
12 Months or More, Fair Value | 1,197,592 | 1,246,818
12 Months or More, Unrealized Losses | $ (148,508) | $ (220,871)
Total, Number of Holdings | holding | 301 | 370
Total, Fair Value | $ 1,212,960 | $ 3,871,540
Total, Unrealized Losses | (148,530) | (252,410)
Agency CMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 542,126 | 1,468,615
Less Than 12 Months, Unrealized Losses | (10,939) | (32,528)
12 Months or More, Fair Value | 2,395,394 | 1,540,263
12 Months or More, Unrealized Losses | $ (327,500) | $ (333,185)
Total, Number of Holdings | holding | 184 | 185
Total, Fair Value | $ 2,937,520 | $ 3,008,878
Total, Unrealized Losses | (338,439) | (365,713)
CMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 151,663 |
Less Than 12 Months, Unrealized Losses | (362) |
12 Months or More, Fair Value | 72,197 | 457,423
12 Months or More, Unrealized Losses | $ (533) | $ (6,008)
Total, Number of Holdings | holding | 16 | 32
Total, Fair Value | $ 223,860 | $ 457,423
Total, Unrealized Losses | (895) | (6,008)
Corporate debt |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 14,948 |
Less Than 12 Months, Unrealized Losses | (52) |
12 Months or More, Fair Value | 297,613 | 426,805
12 Months or More, Unrealized Losses | $ (23,383) | $ (43,755)
Total, Number of Holdings | holding | 41 | 59
Total, Fair Value | $ 312,561 | $ 426,805
Total, Unrealized Losses | (23,435) | (43,755)
Private label MBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 0
Less Than 12 Months, Unrealized Losses | 0 | 0
12 Months or More, Fair Value | 38,052 | 39,219
12 Months or More, Unrealized Losses | $ (3,035) | $ (4,862)
Total, Number of Holdings | holding | 3 | 3
Total, Fair Value | $ 38,052 | $ 39,219
Total, Unrealized Losses | (3,035) | (4,862)
Other |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 4,994 |
Less Than 12 Months, Unrealized Losses | (6) |
12 Months or More, Fair Value | 4,489 | 9,205
12 Months or More, Unrealized Losses | $ (391) | $ (650)
Total, Number of Holdings | holding | 2 | 2
Total, Fair Value | $ 9,483 | $ 9,205
Total, Unrealized Losses | $ (397) | $ (650)

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