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INVESTMENT SECURITIES - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 2,622,526 |  | $ 2,524,663 |  |  |
Allowance for Credit Losses | (5,339) | $ (5,069) | (3,952) | $ (3,439) | $ (2,173) | $ (578)
Gross Unrealized Gains | 1,717 |  | 1,296 |  |  |
Gross Unrealized Losses | (141,146) |  | (145,147) |  |  |
Fair Value | 2,477,758 |  | 2,376,860 |  |  |
Equity securities | 33,892 |  | 28,780 |  |  |
Total investment securities, at fair value | 2,511,650 |  | 2,405,640 |  |  |
Available-for-sale debt securities, accrued interest | 18,500 |  | 14,700 |  |  |
Asset-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 50,517 |  | 97,359 |  |  |
Allowance for Credit Losses | (367) | (450) | (483) | (1,563) | (790) | (578)
Gross Unrealized Gains | 0 |  | 15 |  |  |
Gross Unrealized Losses | (3,038) |  | (4,262) |  |  |
Fair Value | 47,112 |  | 92,629 |  |  |
Agency-guaranteed residential mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 198,732 |  |  |  |  |
Allowance for Credit Losses | 0 |  |  |  |  |
Gross Unrealized Gains | 943 |  |  |  |  |
Gross Unrealized Losses | (188) |  |  |  |  |
Fair Value | 199,487 |  |  |  |  |
Agency-guaranteed residential collateralized mortgage obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 181,750 |  | 129,589 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 19 |  | 0 |  |  |
Gross Unrealized Losses | (12,257) |  | (12,681) |  |  |
Fair Value | 169,512 |  | 116,908 |  |  |
Agency-guaranteed commercial collateralized mortgage obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 83,180 |  |  |  |  |
Allowance for Credit Losses | 0 |  |  |  |  |
Gross Unrealized Gains | 133 |  |  |  |  |
Gross Unrealized Losses | (1,495) |  |  |  |  |
Fair Value | 81,818 |  |  |  |  |
Collateralized loan obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 412,452 |  | 500,109 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 0 |  | 1 |  |  |
Gross Unrealized Losses | (6,419) |  | (11,018) |  |  |
Fair Value | 406,033 |  | 489,092 |  |  |
Commercial mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 100,610 |  | 125,885 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized Losses | (1,588) |  | (4,249) |  |  |
Fair Value | 99,022 |  | 121,636 |  |  |
Corporate notes |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 655,759 |  | 636,880 |  |  |
Allowance for Credit Losses | (4,972) | $ (4,619) | (3,469) | $ (1,876) | $ (1,383) | $ 0
Gross Unrealized Gains | 131 |  | 79 |  |  |
Gross Unrealized Losses | (63,173) |  | (50,456) |  |  |
Fair Value | 587,745 |  | 583,034 |  |  |
Private label collateralized mortgage obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | 939,526 |  | 1,034,841 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 491 |  | 1,201 |  |  |
Gross Unrealized Losses | (52,988) |  | (62,481) |  |  |
Fair Value | $ 887,029 |  | $ 973,561 |  |  |

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