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, 2022	Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest (expense) income	$ 11,939	$ 9,599
Compensation and employee benefits	6,924	6,021
Income tax expense	(49)	551
Total reclassification for the period, net of tax	(553)	745
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	0	110
Total reclassification for the period, net of tax	(370)	(280)
Interest rate contracts | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest (expense) income	(322)	(338)
Net actuarial loss | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Compensation and employee benefits	$ (48)	$ (52)