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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 524,074 | $ 618,574
Less than 12 Months, Unrealized Losses | (8,916) | (11,103)
12 Months or More, Fair Value | 619,146 | 974,040
12 Months or More, Unrealized Losses | (48,102) | (56,938)
Total, Fair Value | 1,143,220 | 1,592,614
Total, Unrealized Losses | (57,018) | (68,041)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 |
Less than 12 Months, Unrealized Losses | 0 |
12 Months or More, Fair Value | 3,200 |
12 Months or More, Unrealized Losses | (216) |
Total, Fair Value | 3,200 |
Total, Unrealized Losses | (216) |
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 308,429 | 266,568
Less than 12 Months, Unrealized Losses | (3,417) | (3,745)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Total, Fair Value | 308,429 | 266,568
Total, Unrealized Losses | (3,417) | (3,745)
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 115,580 | 126,602
Less than 12 Months, Unrealized Losses | (1,540) | (2,717)
12 Months or More, Fair Value | 96,069 | 100,144
12 Months or More, Unrealized Losses | (9,848) | (13,395)
Total, Fair Value | 211,649 | 226,746
Total, Unrealized Losses | (11,388) | (16,112)
Agency-guaranteed commercial collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 44,598 | 85,902
Less than 12 Months, Unrealized Losses | (1,926) | (2,819)
12 Months or More, Fair Value | 30,891 | 0
12 Months or More, Unrealized Losses | (1,419) | 0
Total, Fair Value | 75,489 | 85,902
Total, Unrealized Losses | (3,345) | (2,819)
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 35,710
Less than 12 Months, Unrealized Losses | 0 | (265)
12 Months or More, Fair Value | 10,552 | 205,639
12 Months or More, Unrealized Losses | (248) | (1,928)
Total, Fair Value | 10,552 | 241,349
Total, Unrealized Losses | (248) | (2,193)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value |  | 0
Less than 12 Months, Unrealized Losses |  | 0
12 Months or More, Fair Value |  | 77,708
12 Months or More, Unrealized Losses |  | (999)
Total, Fair Value |  | 77,708
Total, Unrealized Losses |  | (999)
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 25,766 | 74,373
Less than 12 Months, Unrealized Losses | (1,734) | (976)
12 Months or More, Fair Value | 143,729 | 239,509
12 Months or More, Unrealized Losses | (9,544) | (16,064)
Total, Fair Value | 169,495 | 313,882
Total, Unrealized Losses | (11,278) | (17,040)
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 29,701 | 29,419
Less than 12 Months, Unrealized Losses | (299) | (581)
12 Months or More, Fair Value | 334,705 | 351,040
12 Months or More, Unrealized Losses | (26,827) | (24,552)
Total, Fair Value | 364,406 | 380,459
Total, Unrealized Losses | $ (27,126) | $ (25,133)

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