GOODWILL AND OTHER INTANGIBLE ASSETS - Net Carrying Amount of Goodwill By Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning balance		$ 363,436	$ 363,436
No Activity			0
Goodwill Impairment Loss		(54,391)	0	$ 0
Ending balance	$ 309,045	309,045	363,436	363,436
Community Banking
Goodwill [Roll Forward]
Beginning balance		331,689	331,689
No Activity			0
Goodwill Impairment Loss	(54,400)	(54,391)
Ending balance	277,298	277,298	331,689	331,689
Insurance
Goodwill [Roll Forward]
Beginning balance		0	0
No Activity			0
Goodwill Impairment Loss		0
Ending balance	0	0	0	0
Investment Management
Goodwill [Roll Forward]
Beginning balance		31,747	31,747
No Activity			0
Goodwill Impairment Loss		0
Ending balance	$ 31,747	$ 31,747	$ 31,747	$ 31,747