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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 308,178 | $ 618,574
Less than 12 Months, Unrealized Losses | (3,548) | (11,103)
12 Months or More, Fair Value | 676,096 | 974,040
12 Months or More, Unrealized Losses | (32,419) | (56,938)
Total, Fair Value | 984,274 | 1,592,614
Total, Unrealized Losses | (35,967) | (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 | 81,699 |
12 Months or More, Unrealized Losses | (20) |
Total, Fair Value | 81,699 |
Total, Unrealized Losses | (20) |
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 20,022 | 266,568
Less than 12 Months, Unrealized Losses | (140) | (3,745)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Total, Fair Value | 20,022 | 266,568
Total, Unrealized Losses | (140) | (3,745)
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 230,892 | 126,602
Less than 12 Months, Unrealized Losses | (1,715) | (2,717)
12 Months or More, Fair Value | 95,096 | 100,144
12 Months or More, Unrealized Losses | (6,891) | (13,395)
Total, Fair Value | 325,988 | 226,746
Total, Unrealized Losses | (8,606) | (16,112)
Agency-guaranteed commercial collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 10,157 | 85,902
Less than 12 Months, Unrealized Losses | (49) | (2,819)
12 Months or More, Fair Value | 65,250 | 0
12 Months or More, Unrealized Losses | (2,362) | 0
Total, Fair Value | 75,407 | 85,902
Total, Unrealized Losses | (2,411) | (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 | 10,660 | 205,639
12 Months or More, Unrealized Losses | (149) | (1,928)
Total, Fair Value | 10,660 | 241,349
Total, Unrealized Losses | (149) | (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 | 17,198 | 74,373
Less than 12 Months, Unrealized Losses | (1,552) | (976)
12 Months or More, Fair Value | 86,888 | 239,509
12 Months or More, Unrealized Losses | (6,112) | (16,064)
Total, Fair Value | 104,086 | 313,882
Total, Unrealized Losses | (7,664) | (17,040)
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 29,909 | 29,419
Less than 12 Months, Unrealized Losses | (92) | (581)
12 Months or More, Fair Value | 336,503 | 351,040
12 Months or More, Unrealized Losses | (16,885) | (24,552)
Total, Fair Value | 366,412 | 380,459
Total, Unrealized Losses | $ (16,977) | $ (25,133)

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