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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 532,265 | $ 1,585,495
Less than 12 Months, Unrealized Losses | (29,079) | (102,076)
12 Months or More, Fair Value | 1,910,791 | 901,562
12 Months or More, Unrealized Losses | (146,499) | (75,307)
Total, Fair Value | 2,443,056 | 2,487,057
Total, Unrealized Losses | (175,578) | (177,383)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 21,932 | 160,542
Less than 12 Months, Unrealized Losses | (23) | (8,050)
12 Months or More, Fair Value | 52,780 | 0
12 Months or More, Unrealized Losses | (3,409) | 0
Total, Fair Value | 74,712 | 160,542
Total, Unrealized Losses | (3,432) | (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 | 125,308 | 0
12 Months or More, Unrealized Losses | (13,561) | 0
Total, Fair Value | 125,308 | 133,864
Total, Unrealized Losses | (13,561) | (13,617)
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 89,992 | 386,701
Less than 12 Months, Unrealized Losses | (2,442) | (13,516)
12 Months or More, Fair Value | 599,341 | 315,270
12 Months or More, Unrealized Losses | (15,562) | (10,826)
Total, Fair Value | 689,333 | 701,971
Total, Unrealized Losses | (18,004) | (24,342)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 17,756 | 39,828
Less than 12 Months, Unrealized Losses | (506) | (1,410)
12 Months or More, Fair Value | 114,718 | 93,005
12 Months or More, Unrealized Losses | (3,961) | (4,456)
Total, Fair Value | 132,474 | 132,833
Total, Unrealized Losses | (4,467) | (5,866)
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 105,912 | 386,464
Less than 12 Months, Unrealized Losses | (3,892) | (36,119)
12 Months or More, Fair Value | 424,070 | 178,955
12 Months or More, Unrealized Losses | (50,457) | (25,759)
Total, Fair Value | 529,982 | 565,419
Total, Unrealized Losses | (54,349) | (61,878)
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 296,673 | 478,096
Less than 12 Months, Unrealized Losses | (22,216) | (29,364)
12 Months or More, Fair Value | 594,574 | 314,332
12 Months or More, Unrealized Losses | (59,549) | (34,266)
Total, Fair Value | 891,247 | 792,428
Total, Unrealized Losses | $ (81,765) | $ (63,630)

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