INVESTMENT SECURITIES (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) security
Debt and Equity Securities, FV-NI [Line Items]
Asset backed securities pledged to secure certain deposits	$ 50,900	$ 55,000
Recognized net gains	600
Securities available for sale ("AFS"), at fair value	497,839	507,527
Amortized cost	500,478	533,182
Accrued interest receivable ("AIR")	1,100	$ 1,200
Number of AFS debt securities in an unrealized loss position | security		295
Available for Sale Securities Sold
Debt and Equity Securities, FV-NI [Line Items]
Securities available for sale ("AFS"), at fair value	$ 11,900