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SECURITIES - Securities Pledged and Equity Method Investments (Details)
$ in Millions
Dec. 31, 2021
USD ($)
securitiePledged
Dec. 31, 2020
USD ($)
securitiePledged
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Fair value of securities pledged to secure public funds on deposit or for other purposes $ 242.9 $ 180.8
Number of securities pledged | securitiePledged 0 0
Cephas Capital Partners, L.P.    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Equity method investments $ 0.1 $ 0.2