DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Outstanding Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Fair Value, Asset	$ 153,607	$ 194,665
Fair Value, Liability	72,758	37,797
Interest rate lock commitments
Derivative [Line Items]
Notional, Assets	5,120,259	11,530,721
Notional, Liabilities	2,569,129	1,125,911
Fair Value, Asset	91,886	184,383
Fair Value, Liability	34,281	3,763
Forward sale contracts
Derivative [Line Items]
Notional, Assets	17,168,753	19,482,705
Notional, Liabilities	2,335,109	13,171,462
Fair Value, Asset	43,926	5,358
Fair Value, Liability	10,694	2,964
Put options on treasuries
Derivative [Line Items]
Notional, Assets	0	0
Notional, Liabilities	3,500	16,980
Fair Value, Asset	0	0
Fair Value, Liability	9,113	31,070
MBS put options
Derivative [Line Items]
Notional, Assets	2,150,000
Notional, Liabilities	1,300,000
Fair Value, Asset	17,795
Fair Value, Liability	12,924
Interest rate swap futures
Derivative [Line Items]
Notional, Assets	0	2,640
Notional, Liabilities	3,339	0
Fair Value, Asset	0	4,924
Fair Value, Liability	$ 5,746	$ 0