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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 285,238 | $ 1,585,495
Less than 12 Months, Unrealized Losses | (15,183) | (102,076)
12 Months or More, Fair Value | 2,070,331 | 901,562
12 Months or More, Unrealized Losses | (135,150) | (75,307)
Total, Fair Value | 2,355,569 | 2,487,057
Total, Unrealized Losses | (150,333) | (177,383)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 160,542
Less than 12 Months, Unrealized Losses | 0 | (8,050)
12 Months or More, Fair Value | 42,932 | 0
12 Months or More, Unrealized Losses | (2,547) | 0
Total, Fair Value | 42,932 | 160,542
Total, Unrealized Losses | (2,547) | (8,050)
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 133,864
Less than 12 Months, Unrealized Losses | 0 | (13,617)
12 Months or More, Fair Value | 133,425 | 0
12 Months or More, Unrealized Losses | (14,956) | 0
Total, Fair Value | 133,425 | 133,864
Total, Unrealized Losses | (14,956) | (13,617)
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 46,333 | 386,701
Less than 12 Months, Unrealized Losses | (1,472) | (13,516)
12 Months or More, Fair Value | 614,978 | 315,270
12 Months or More, Unrealized Losses | (10,253) | (10,826)
Total, Fair Value | 661,311 | 701,971
Total, Unrealized Losses | (11,725) | (24,342)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 39,828
Less than 12 Months, Unrealized Losses | 0 | (1,410)
12 Months or More, Fair Value | 134,866 | 93,005
12 Months or More, Unrealized Losses | (4,923) | (4,456)
Total, Fair Value | 134,866 | 132,833
Total, Unrealized Losses | (4,923) | (5,866)
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 84,827 | 386,464
Less than 12 Months, Unrealized Losses | (3,106) | (36,119)
12 Months or More, Fair Value | 469,187 | 178,955
12 Months or More, Unrealized Losses | (45,202) | (25,759)
Total, Fair Value | 554,014 | 565,419
Total, Unrealized Losses | (48,308) | (61,878)
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 154,078 | 478,096
Less than 12 Months, Unrealized Losses | (10,605) | (29,364)
12 Months or More, Fair Value | 674,943 | 314,332
12 Months or More, Unrealized Losses | (57,269) | (34,266)
Total, Fair Value | 829,021 | 792,428
Total, Unrealized Losses | $ (67,874) | $ (63,630)

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