OTHER INTANGIBLES - Core Deposit Intangibles (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying amount	$ 123,285	$ 104,643
Other intangibles acquired	0	18,642
Accumulated amortization	(94,004)	(87,443)
Total core deposit and other intangibles	$ 29,281	$ 35,842