COLLATERALIZED ARRANGEMENTS AND FINANCING - Crypto Assets Held as Collateral and Obligation to Return (Details) $ in Thousands	Jun. 30, 2025 USD ($) unit	Dec. 31, 2024 USD ($) unit
Crypto Asset, Holding [Line Items]
Fair Value	$ 972,661	$ 792,125
Cost Basis	678,565	521,597
Crypto assets held as collateral	951,272	767,484
Total recognized held as collateral	972,661	792,125
Assets pledged as collateral not meeting derecognition criteria
Crypto Asset, Holding [Line Items]
Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability	$ 615,093	$ 288,601
Crypto Assets \| Bitcoin
Crypto Asset, Holding [Line Items]
Units \| unit	7,978	6,918
Cost Basis	$ 577,798	$ 414,745
Crypto assets held as collateral	$ 859,940	$ 647,568
Crypto Assets \| Ethereum
Crypto Asset, Holding [Line Items]
Units \| unit	36,750	33,130
Cost Basis	$ 100,767	$ 98,787
Crypto assets held as collateral	$ 91,332	111,445
Crypto Assets \| Other crypto assets
Crypto Asset, Holding [Line Items]
Units \| unit	0
Cost Basis	$ 0	8,065
Crypto assets held as collateral	0	8,471
Crypto Assets \| Assets pledged as collateral not meeting derecognition criteria
Crypto Asset, Holding [Line Items]
Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability	532,575	178,619
Fiat
Crypto Asset, Holding [Line Items]
Fair Value	21,389	24,641
Fiat \| Assets pledged as collateral not meeting derecognition criteria
Crypto Asset, Holding [Line Items]
Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability	50,161	64,760
USDC \| Assets pledged as collateral not meeting derecognition criteria
Crypto Asset, Holding [Line Items]
Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability	$ 32,357	$ 45,222