DERIVATIVES AND HEDGING ACTIVITIES - Fair Value Hedges Narrative (Details) - Fair value hedges - Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Oct. 31, 2023
DERIVATIVES AND HEDGING ACTIVITIES
Clearing house related to the fair value derivatives	$ 6,500
Interest Rate Swaps
DERIVATIVES AND HEDGING ACTIVITIES
Notional amount, liabilities		$ 500,000
Average fixed interest rate	4.82%
Mortgage loans - Amortized Cost	$ 729,500
Last-of-layer in the open hedge relationship	500,000
Basis adjustment associated with the hedge	6,600
Interest income from swap transaction	$ 561

Amount payable to other broker-dealer and clearing organization, including, but not limited to, security failed-to-receive, deposit received for security loaned, open transaction, and floor-brokerage payable.

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Nominal or face amount used to calculate payments on the derivative liability.

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Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, in portfolio layer hedging relationship.

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Amount of increase (decrease) in interest income for hedge basis adjustment from hedged layer exceeding outstanding amount of closed portfolio of financial asset or beneficial interest secured by financial instrument.

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