NONINTEREST INCOME - Investment Management and Fiduciary Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Investment management and fiduciary income
Revenue from External Customer [Line Items]
Noninterest income	$ 30,476	$ 30,181
Trust fees
Revenue from External Customer [Line Items]
Noninterest income	20,516	19,090
Wealth management and advisory fees
Revenue from External Customer [Line Items]
Noninterest income	$ 9,960	$ 11,091