NONINTEREST INCOME - Investment Management and Fiduciary Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Investment management and fiduciary income
Revenue from External Customer [Line Items]
Noninterest fee income	$ 30,181	$ 14,253
Trust fees
Revenue from External Customer [Line Items]
Noninterest fee income	19,090	9,764
Wealth management and advisory fees
Revenue from External Customer [Line Items]
Noninterest fee income	$ 11,091	$ 4,489