NONINTEREST INCOME - Investment Management and Fiduciary Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Investment management and fiduciary income
Revenue from External Customer [Line Items]
Noninterest fee income	$ 31,192	$ 15,360	$ 61,373	$ 29,613
Trust fees
Revenue from External Customer [Line Items]
Noninterest fee income	20,398	10,808	39,488	20,572
Wealth management and advisory fees
Revenue from External Customer [Line Items]
Noninterest fee income	$ 10,794	$ 4,552	$ 21,885	$ 9,041