DERIVATIVES AND HEDGING ACTIVITIES - Fair value and cash flow hedge accounting on the consolidated statements of financial condition (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Designated as Hedging Instrument | Fair value hedges | Interest Rate Products
DERIVATIVES AND HEDGING ACTIVITIES
Notional amount, liabilities	$ 500,000
Fair Value Liabilities	6,594
Designated as Hedging Instrument | Cash flow hedges | Interest Rate Products
DERIVATIVES AND HEDGING ACTIVITIES
Notional amount, assets	150,000	$ 150,000
Notional amount, liabilities	200,000
Fair Value Assets	12,492	17,874
Fair Value Liabilities	5,031
Not Designated as Hedging Instrument | Interest Rate Products
DERIVATIVES AND HEDGING ACTIVITIES
Notional amount, assets	1,682,961	1,594,356
Notional amount, liabilities	1,682,961	1,594,356
Fair Value Assets	114,671	137,335
Fair Value Liabilities	114,671	137,335
Not Designated as Hedging Instrument | Other Contract
DERIVATIVES AND HEDGING ACTIVITIES
Notional amount, liabilities	93,891	71,103
Fair Value Liabilities	$ 24	$ 33