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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 317,303 | $ 356,234
Less than 12 Months, Unrealized Losses | (5,035) | (12,782)
12 Months or More, Fair Value | 1,374,196 | 1,778,899
12 Months or More, Unrealized Losses | (75,097) | (116,764)
Total, Fair Value | 1,691,499 | 2,135,133
Total, Unrealized Losses | (80,132) | (129,546)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Losses | 0 | 0
12 Months or More, Fair Value | 30,960 | 64,029
12 Months or More, Unrealized Losses | (1,241) | (4,027)
Total, Fair Value | 30,960 | 64,029
Total, Unrealized Losses | (1,241) | (4,027)
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Losses | 0 | 0
12 Months or More, Fair Value | 109,456 | 116,908
12 Months or More, Unrealized Losses | (7,933) | (12,681)
Total, Fair Value | 109,456 | 116,908
Total, Unrealized Losses | (7,933) | (12,681)
Agency-guaranteed commercial collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 45,080 |
Less than 12 Months, Unrealized Losses | (618) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Total, Fair Value | 45,080 |
Total, Unrealized Losses | (618) |
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 37,164 | 29,241
Less than 12 Months, Unrealized Losses | (284) | (392)
12 Months or More, Fair Value | 250,635 | 438,551
12 Months or More, Unrealized Losses | (4,483) | (10,626)
Total, Fair Value | 287,799 | 467,792
Total, Unrealized Losses | (4,767) | (11,018)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Losses | 0 | 0
12 Months or More, Fair Value | 77,074 | 121,636
12 Months or More, Unrealized Losses | (1,637) | (4,249)
Total, Fair Value | 77,074 | 121,636
Total, Unrealized Losses | (1,637) | (4,249)
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 59,408 | 23,243
Less than 12 Months, Unrealized Losses | (766) | (1,147)
12 Months or More, Fair Value | 319,371 | 424,768
12 Months or More, Unrealized Losses | (26,637) | (33,764)
Total, Fair Value | 378,779 | 448,011
Total, Unrealized Losses | (27,403) | (34,911)
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 175,651 | 303,750
Less than 12 Months, Unrealized Losses | (3,367) | (11,243)
12 Months or More, Fair Value | 586,700 | 613,007
12 Months or More, Unrealized Losses | (33,166) | (51,417)
Total, Fair Value | 762,351 | 916,757
Total, Unrealized Losses | $ (36,533) | $ (62,660)

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