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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 689,933 | $ 1,585,495
Less than 12 Months, Unrealized Losses | (27,949) | (102,076)
12 Months or More, Fair Value | 1,835,862 | 901,562
12 Months or More, Unrealized Losses | (134,878) | (75,307)
Total, Fair Value | 2,525,795 | 2,487,057
Total, Unrealized Losses | (162,827) | (177,383)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 21,902 | 160,542
Less than 12 Months, Unrealized Losses | (46) | (8,050)
12 Months or More, Fair Value | 99,525 | 0
12 Months or More, Unrealized Losses | (3,968) | 0
Total, Fair Value | 121,427 | 160,542
Total, Unrealized Losses | (4,014) | (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 | 133,753 | 0
12 Months or More, Unrealized Losses | (9,964) | 0
Total, Fair Value | 133,753 | 133,864
Total, Unrealized Losses | (9,964) | (13,617)
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 209,389 | 386,701
Less than 12 Months, Unrealized Losses | (3,648) | (13,516)
12 Months or More, Fair Value | 582,070 | 315,270
12 Months or More, Unrealized Losses | (17,840) | (10,826)
Total, Fair Value | 791,459 | 701,971
Total, Unrealized Losses | (21,488) | (24,342)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 17,742 | 39,828
Less than 12 Months, Unrealized Losses | (520) | (1,410)
12 Months or More, Fair Value | 115,676 | 93,005
12 Months or More, Unrealized Losses | (4,716) | (4,456)
Total, Fair Value | 133,418 | 132,833
Total, Unrealized Losses | (5,236) | (5,866)
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 152,391 | 386,464
Less than 12 Months, Unrealized Losses | (8,607) | (36,119)
12 Months or More, Fair Value | 341,401 | 178,955
12 Months or More, Unrealized Losses | (42,169) | (25,759)
Total, Fair Value | 493,792 | 565,419
Total, Unrealized Losses | (50,776) | (61,878)
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 288,509 | 478,096
Less than 12 Months, Unrealized Losses | (15,128) | (29,364)
12 Months or More, Fair Value | 563,437 | 314,332
12 Months or More, Unrealized Losses | (56,221) | (34,266)
Total, Fair Value | 851,946 | 792,428
Total, Unrealized Losses | $ (71,349) | $ (63,630)

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