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INVESTMENT SECURITIES - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 2,488,717 |  | $ 2,524,663 |  |  |
Allowance for Credit Losses | (4,639) | $ (5,339) | (3,952) | $ (3,849) | $ (3,439) | $ (578)
Gross Unrealized Gains | 9,314 |  | 1,296 |  |  |
Gross Unrealized Losses | (115,659) |  | (145,147) |  |  |
Fair Value | 2,377,733 |  | 2,376,860 |  |  |
Equity securities | 34,336 |  | 28,780 |  |  |
Total investment securities, at fair value | 2,412,069 |  | 2,405,640 |  |  |
Available-for-sale debt securities, accrued interest | 19,400 |  | 14,700 |  |  |
Asset-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 40,179 |  | 97,359 |  |  |
Allowance for Credit Losses | (307) | (367) | (483) | (1,755) | (1,563) | (578)
Gross Unrealized Gains | 0 |  | 15 |  |  |
Gross Unrealized Losses | (2,202) |  | (4,262) |  |  |
Fair Value | 37,670 |  | 92,629 |  |  |
Agency-guaranteed residential mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 216,821 |  |  |  |  |
Allowance for Credit Losses | 0 |  |  |  |  |
Gross Unrealized Gains | 4,357 |  |  |  |  |
Gross Unrealized Losses | 0 |  |  |  |  |
Fair Value | 221,178 |  |  |  |  |
Agency-guaranteed residential collateralized mortgage obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 201,529 |  | 129,589 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 1,277 |  | 0 |  |  |
Gross Unrealized Losses | (7,933) |  | (12,681) |  |  |
Fair Value | 194,873 |  | 116,908 |  |  |
Agency-guaranteed commercial collateralized mortgage obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 96,200 |  |  |  |  |
Allowance for Credit Losses | 0 |  |  |  |  |
Gross Unrealized Gains | 1,361 |  |  |  |  |
Gross Unrealized Losses | (618) |  |  |  |  |
Fair Value | 96,943 |  |  |  |  |
Collateralized loan obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 315,096 |  | 500,109 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 100 |  | 1 |  |  |
Gross Unrealized Losses | (4,767) |  | (11,018) |  |  |
Fair Value | 310,429 |  | 489,092 |  |  |
Commercial mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 78,711 |  | 125,885 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized Losses | (1,637) |  | (4,249) |  |  |
Fair Value | 77,074 |  | 121,636 |  |  |
Corporate notes |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 660,626 |  | 636,880 |  |  |
Allowance for Credit Losses | (4,332) | $ (4,972) | (3,469) | $ (2,094) | $ (1,876) | $ 0
Gross Unrealized Gains | 646 |  | 79 |  |  |
Gross Unrealized Losses | (61,969) |  | (50,456) |  |  |
Fair Value | 594,971 |  | 583,034 |  |  |
Private label collateralized mortgage obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 879,555 |  | 1,034,841 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 1,573 |  | 1,201 |  |  |
Gross Unrealized Losses | (36,533) |  | (62,481) |  |  |
Fair Value | $ 844,595 |  | $ 973,561 |  |  |

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