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DERIVATIVES - Fair Values of Derivatives Reported on Condensed Consolidated Statements of Financial Condition (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Derivatives, Fair Value [Line Items] |  |
Derivative assets, fair value | $ 923 | $ 4,373
Derivative assets, fair value, total | 523 | 3,787
Derivative assets, notional amount | 127,096 | 360,748
Derivative liabilities, fair value | 230,301 | 289,442
Derivative liabilities, collateral not netted on the condensed consolidated statement of financial condition | (31,978) | (1,132)
Derivative liabilities, fair value, total | 190,609 | 273,148
Derivative liabilities, notional | 720,055 | 531,202
Forward foreign currency exchange rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, fair value | 770 | 4,248
Derivative assets fair value counterparty and cash collateral netting | (247) | (461)
Derivative assets, notional amount | 126,660 | 359,717
Derivative liabilities, fair value | 5,707 | 1,068
Derivative liabilities, fair value, counterparty and cash collateral netting | (247) | (460)
Derivative liabilities, notional | 381,319 | 167,115
Total return swaps and other |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, fair value | 153 | 125
Derivative assets fair value counterparty and cash collateral netting | (153) | (125)
Derivative assets, notional amount | 436 | 1,031
Derivative liabilities, fair value | 39,450 | 17,527
Derivative liabilities, fair value, counterparty and cash collateral netting | (7,467) | (14,702)
Derivative liabilities, notional | 177,950 | 116,239
LFI and other similar deferred compensation arrangements |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, fair value | 0 | 0
Derivative assets, notional amount | 0 | 0
Derivative liabilities, fair value | 185,144 | 270,847
Derivative liabilities, notional | 160,786 | 247,848
Net derivatives in "other assets" and "other liabilities" |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, net derivatives | 523 | 3,787
Derivative liabilities, net derivatives | $ 222,587 | $ 274,280

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