BASIS OF PRESENTATION (Details) $ / shares in Units, $ in Millions		3 Months Ended
	Feb. 01, 2021 $ / shares shares	Mar. 31, 2021 USD ($) item $ / shares	Dec. 31, 2020 USD ($) $ / shares
BASIS OF PRESENTATION
Subordinated notes payable, net | $		$ 197.2	$ 114.1
Number of retail banking offices | item		67
Merger agreement:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock converted into right to receive shares (in shares) | shares	0.6480
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01