GOODWILL AND INTANGIBLE ASSETS - Acquired intangible assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Balance Acquired	$ 11,608	$ 11,608
Accumulated Amortization	11,604	11,593
Core deposit intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Balance Acquired	5,975	5,975
Accumulated Amortization	5,975	5,974
Other customer relationship intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Balance Acquired	5,633	5,633
Accumulated Amortization	$ 5,629	$ 5,619