FAIR VALUE OF FINANCIAL INSTRUMENTS - Individually evaluated loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract]
Individually evaluated loans outstanding balance, net of a valuation allowance	$ 10,653,510		$ 10,483,324
Allowance for credit losses	78,335		83,507
Credit loss (release) provision	(3,648)	$ (1,592)
Nonrecurring
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract]
Individually evaluated loans outstanding balance, net of a valuation allowance	3,100		2,500
Allowance for credit losses	1,200		1,300
Nonrecurring | Level 3 Inputs
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract]
Individually evaluated loans	1,945		1,179
Carrying Amount
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract]
Individually evaluated loans	10,651,565		10,482,145
Carrying Amount | Nonrecurring
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract]
Individually evaluated loans	1,945		$ 1,179
Collateral dependent loans | Nonrecurring
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract]
Credit loss (release) provision	$ (132)