GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Changes in Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Finite-lived Intangible Assets [Roll Forward]
Core deposit premiums, beginning of period	$ 97,242
Amortization	(12,819)	$ (15,403)	$ (16,306)
Core deposit premiums, end of period	84,423	97,242
Core deposit premiums:
Finite-lived Intangible Assets [Roll Forward]
Core deposit premiums, beginning of period	87,575	101,344
Amortization	(11,185)	(13,769)	(14,700)
Core deposit premiums, end of period	76,390	87,575	101,344
Books of business and other intangibles:
Finite-lived Intangible Assets [Roll Forward]
Core deposit premiums, beginning of period	9,667	11,301
Amortization	(1,634)	(1,634)	(1,600)
Core deposit premiums, end of period	$ 8,033	$ 9,667	$ 11,301