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INVESTMENT SECURITIES - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost | $ 1,928,092 | $ 1,928,092 |  | $ 2,087,881 |  |  |
Allowance for Credit Losses | (17,356) | (17,356) | $ (13,127) | (7,604) | $ (5,339) | $ (5,069) | $ (3,952)
Gross Unrealized Gains | 3,100 | 3,100 |  | 732 |  |  |
Gross Unrealized Losses | (67,270) | (67,270) |  | (95,571) |  |  |
Fair Value | 1,846,566 | 1,846,566 |  | 1,985,438 |  |  |
Equity securities | 30,840 | 30,840 |  | 34,256 |  |  |
Total investment securities, at fair value | 1,877,406 | 1,877,406 |  | 2,019,694 |  |  |
Available-for-sale debt securities, accrued interest | 11,500 | 11,500 |  | 15,000 |  |  |
Impairment loss on securities without a readily determinable fair value | 2,300 | 2,300 |  |  |  |  |
Asset-backed securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost | 230,077 | 230,077 |  | 14,820 |  |  |
Allowance for Credit Losses | (584) | (584) | (353) | (362) | (367) | (450) | (483)
Gross Unrealized Gains | 0 | 0 |  | 0 |  |  |
Gross Unrealized Losses | (795) | (795) |  | (1,222) |  |  |
Fair Value | 228,698 | 228,698 |  | 13,236 |  |  |
Agency-guaranteed residential mortgage-backed securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost | 457,217 | 457,217 |  | 330,637 |  |  |
Allowance for Credit Losses | 0 | 0 |  | 0 |  |  |
Gross Unrealized Gains | 831 | 831 |  | 146 |  |  |
Gross Unrealized Losses | (3,417) | (3,417) |  | (3,745) |  |  |
Fair Value | 454,631 | 454,631 |  | 327,038 |  |  |
Agency-guaranteed residential collateralized mortgage obligations |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost | 337,857 | 337,857 |  | 242,858 |  |  |
Allowance for Credit Losses | 0 | 0 |  | 0 |  |  |
Gross Unrealized Gains | 869 | 869 |  | 0 |  |  |
Gross Unrealized Losses | (11,388) | (11,388) |  | (16,112) |  |  |
Fair Value | 327,338 | 327,338 |  | 226,746 |  |  |
Agency-guaranteed commercial collateralized mortgage obligations |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost | 97,755 | 97,755 |  | 95,850 |  |  |
Allowance for Credit Losses | 0 | 0 |  | 0 |  |  |
Gross Unrealized Gains | 321 | 321 |  | 44 |  |  |
Gross Unrealized Losses | (3,345) | (3,345) |  | (2,819) |  |  |
Fair Value | 94,731 | 94,731 |  | 93,075 |  |  |
Collateralized loan obligations |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost | 10,800 | 10,800 |  | 257,500 |  |  |
Allowance for Credit Losses | 0 | 0 |  | 0 |  |  |
Gross Unrealized Gains | 0 | 0 |  | 100 |  |  |
Gross Unrealized Losses | (248) | (248) |  | (2,193) |  |  |
Fair Value | 10,552 | 10,552 |  | 255,407 |  |  |
Commercial mortgage-backed securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost |  |  |  | 78,707 |  |  |
Allowance for Credit Losses |  |  |  | 0 |  |  |
Gross Unrealized Gains |  |  |  | 0 |  |  |
Gross Unrealized Losses |  |  |  | (999) |  |  |
Fair Value |  |  |  | 77,708 |  |  |
Corporate notes |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost | 402,854 | 402,854 |  | 564,524 |  |  |
Allowance for Credit Losses | (16,772) | (16,772) | $ (12,774) | (7,135) | $ (4,972) | $ (4,619) | $ (3,469)
Gross Unrealized Gains | 1,079 | 1,079 |  | 347 |  |  |
Gross Unrealized Losses | (20,951) | (20,951) |  | (41,406) |  |  |
Fair Value | 366,210 | 366,210 |  | 516,330 |  |  |
Private label collateralized mortgage obligations |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Amortized Cost | 391,532 | 391,532 |  | 502,985 |  |  |
Allowance for Credit Losses | 0 | 0 |  | (107) |  |  |
Gross Unrealized Gains | 0 | 0 |  | 95 |  |  |
Gross Unrealized Losses | (27,126) | (27,126) |  | (27,075) |  |  |
Fair Value | $ 364,406 | $ 364,406 |  | $ 475,898 |  |  |

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