DERIVATIVES AND HEDGING ACTIVITIES - Cash Flow Hedges (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
	Mar. 02, 2020	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Feb. 28, 2022	Oct. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-interest income related to changes in the fair value of derivative	$ 45,900		$ 0		$ 0	$ 0	$ 0
Expected interest income on termination		$ 370,000
Interest Rate Swap Interest Income		$ 2,000		$ 2,000
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivatives								$ 300,000
Derivative, fixed interest rate								1.6725%
Initial floating rate of interest								0.2414%
Interest Rate Swap | Cash flow hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivatives	$ 400,000								$ 400,000
Derivative, fixed interest rate									3.018%