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Name:	us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

SECURITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
SECURITIES - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Residential Investment securities sold, carrying value	$ 6,600.0	$ 3,300.0		$ 9,400.0	$ 6,200.0
Commercial Mortgage-Backed Securities
Debt Securities, Available-for-sale [Line Items]
Impairment, available-for-sale debt security			$ 0.4