NONINTEREST INCOME - Schedule of Investment Management and Fiduciary Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investment management and fiduciary income
Revenue from External Customer [Line Items]
Noninterest income	$ 32,720	$ 29,504	$ 95,575	$ 90,877
Trust fees
Revenue from External Customer [Line Items]
Noninterest income	22,062	19,170	64,514	58,658
Wealth management and advisory fees
Revenue from External Customer [Line Items]
Noninterest income	$ 10,658	$ 10,334	$ 31,061	$ 32,219