INCOME TAXES - Reconciliation Effective Income Tax Amount (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Federal income statutory rate	21.00%	21.00%	21.00%
Tax at federal income tax rate	$ 104,166	$ 71,460	$ 44,433
Change resulting from:
State income tax, net of federal benefit	18,923	9,812	7,389
Tax-exempt interest	(3,479)	(3,726)	(2,911)
Increase in cash value of bank owned life insurance	(997)	(594)	(581)
Excess tax (benefit) deficiency from stock compensation	(277)	371	(108)
Nondeductible merger expenses	142	2	799
Other	721	2,827	1,122
Benefit related to carryback claims resulting from the CARES Act	0	(1,896)	0
Provision for income taxes	$ 119,199	$ 78,256	$ 50,143