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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 478,982 | $ 356,234
Less than 12 Months, Unrealized Losses | (10,541) | (12,782)
12 Months or More, Fair Value | 1,414,307 | 1,778,899
12 Months or More, Unrealized Losses | (102,757) | (116,764)
Total, Fair Value | 1,893,289 | 2,135,133
Total, Unrealized Losses | (113,298) | (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 | 42,665 | 64,029
12 Months or More, Unrealized Losses | (2,771) | (4,027)
Total, Fair Value | 42,665 | 64,029
Total, Unrealized Losses | (2,771) | (4,027)
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 58,493 |
Less than 12 Months, Unrealized Losses | (188) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Total, Fair Value | 58,493 |
Total, Unrealized Losses | (188) |
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 | 109,465 | 116,908
12 Months or More, Unrealized Losses | (12,257) | (12,681)
Total, Fair Value | 109,465 | 116,908
Total, Unrealized Losses | (12,257) | (12,681)
Agency-guaranteed commercial collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 64,227 |
Less than 12 Months, Unrealized Losses | (1,495) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Total, Fair Value | 64,227 |
Total, Unrealized Losses | (1,495) |
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 57,745 | 29,241
Less than 12 Months, Unrealized Losses | (454) | (392)
12 Months or More, Fair Value | 278,681 | 438,551
12 Months or More, Unrealized Losses | (5,965) | (10,626)
Total, Fair Value | 336,426 | 467,792
Total, Unrealized Losses | (6,419) | (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 | 99,022 | 121,636
12 Months or More, Unrealized Losses | (1,588) | (4,249)
Total, Fair Value | 99,022 | 121,636
Total, Unrealized Losses | (1,588) | (4,249)
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 65,085 | 23,243
Less than 12 Months, Unrealized Losses | (1,610) | (1,147)
12 Months or More, Fair Value | 311,986 | 424,768
12 Months or More, Unrealized Losses | (33,972) | (33,764)
Total, Fair Value | 377,071 | 448,011
Total, Unrealized Losses | (35,582) | (34,911)
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 233,432 | 303,750
Less than 12 Months, Unrealized Losses | (6,794) | (11,243)
12 Months or More, Fair Value | 572,488 | 613,007
12 Months or More, Unrealized Losses | (46,204) | (51,417)
Total, Fair Value | 805,920 | 916,757
Total, Unrealized Losses | $ (52,998) | $ (62,660)

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