SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Mortgage Banking Activities
Co-broker fees	$ 3.1	$ 6.3	$ 13.4	$ 15.2