INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating losses and tax credit carryforwards	$ 76,642	$ 5,636
Basis differences related to assets and investments	85,104	18,868
Goodwill	30,485	0
Accrued Expenses	20,171	0
Other	4,632	705
Total deferred tax assets	217,034	25,209
Less valuation allowance	0	0
Net deferred tax assets	217,034	25,209
Deferred tax liabilities:
Mortgage servicing rights	(594,801)	(16,189)
Basis differences related to assets and investments	(21,672)	(12,539)
Fixed asset depreciation	(14,495)	(1,231)
Unrealized mark to market	(26,021)	0
Other	(735)	(3,109)
Total deferred tax liability	(657,724)	(33,068)
Net deferred tax assets (liability)	(440,690)	$ (7,859)
Federal and State Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	266,800
Net operating loss carryforward that will begin to expire in 2034	$ 33,800