ACCUMULATED OTHER COMPREHENSIVE INCOME - Summary of reclassification out of each component of accumulated other comprehensive income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest (expense) income	$ 11,941	$ 11,939
Compensation and benefits	7,847	7,060
Income tax expense	0	(49)
Total reclassification for the period, net of tax	1,209	(553)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	0	0
Total reclassification for the period, net of tax	1,006	(370)
Unrealized Gains and (Losses) on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest (expense) income	1,004	(322)
Post-Retirement Plans | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Compensation and benefits	$ 2	$ (48)