DERIVATIVES AND HEDGING ACTIVITIES - Fair value and cash flow hedge accounting on the consolidated statements of financial condition (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Risk participations
DERIVATIVES AND HEDGING ACTIVITIES
Notional amount, liabilities	$ 140,900	$ 141,100
Designated as Hedging Instrument | Fair value hedges | Interest rate products
DERIVATIVES AND HEDGING ACTIVITIES
Notional amount, liabilities	500,000	500,000
Fair Value Liabilities	39
Designated as Hedging Instrument | Cash flow hedges | Interest rate products
DERIVATIVES AND HEDGING ACTIVITIES
Notional amount, assets	150,000	150,000
Notional amount, liabilities	400,000	350,000
Fair Value Assets	6,591	8,318
Fair Value Liabilities	313	159
Not Designated as Hedging Instrument | Interest rate products
DERIVATIVES AND HEDGING ACTIVITIES
Notional amount, assets	1,644,759	1,665,949
Notional amount, liabilities	1,644,759	1,665,949
Fair Value Assets	92,149	108,178
Fair Value Liabilities	92,149	108,178
Not Designated as Hedging Instrument | Risk participations
DERIVATIVES AND HEDGING ACTIVITIES
Notional amount, liabilities	140,853	141,080
Fair Value Liabilities	$ 15	$ 10