DERIVATIVES AND HEDGING ACTIVITIES - Fair value and cash flow hedge accounting on the consolidated statements of financial condition (Details) - Interest Rate Products - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Designated as Hedging Instrument | Fair value hedges
DERIVATIVES AND HEDGING ACTIVITIES
Notional amount, liabilities	$ 500,000	$ 500,000
Fair Value Liabilities	400	6,594
Designated as Hedging Instrument | Cash Flow Hedging
DERIVATIVES AND HEDGING ACTIVITIES
Notional amount, assets	200,000	150,000
Notional amount, liabilities	200,000	200,000
Fair Value Assets	12,134	12,492
Fair Value Liabilities	701	5,031
Not Designated as Hedging Instrument
DERIVATIVES AND HEDGING ACTIVITIES
Notional amount, assets	1,671,895	1,682,961
Notional amount, liabilities	1,671,895	1,682,961
Fair Value Assets	122,401	114,671
Fair Value Liabilities	$ 122,401	$ 114,671