GOODWILL AND OTHER INTANGIBLE ASSETS - Net Carrying Amount of Goodwill By Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Beginning balance	$ 370,223	$ 370,223
No Activity		0
Disposal of subsidiary's assets	(6,787)
Ending balance	363,436	370,223
Community Banking
Goodwill [Roll Forward]
Beginning balance	331,689	331,689
No Activity		0
Disposal of subsidiary's assets	0
Ending balance	331,689	331,689
Insurance
Goodwill [Roll Forward]
Beginning balance	6,787	6,787
No Activity		0
Disposal of subsidiary's assets	(6,787)
Ending balance	0	6,787
Investment Management
Goodwill [Roll Forward]
Beginning balance	31,747	31,747
No Activity		0
Disposal of subsidiary's assets	0
Ending balance	$ 31,747	$ 31,747