GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Goodwill
Goodwill carrying amount	$ 105,950	$ 105,950
Number of reporting unit | item	1
Core deposit intangibles, a trademark, and servicing assets	$ 1,700	$ 1,300