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LOANS HELD FOR SALE, AT FAIR VALUE - Unpaid Principal Balance of LHFS by Loan Type (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 8,678,433	$ 6,693,111
Fair value adjustment	195,303	262,313
Total	$ 8,873,736	$ 6,955,424
Product Concentration Risk | Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	100.00%	100.00%
Fixed | Confirming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 5,764,345	$ 5,223,177
Fixed | Confirming | Product Concentration Risk | Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	66.00%	78.00%
Fixed | Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 990,566	$ 1,108,936
Fixed | Government | Product Concentration Risk | Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	12.00%	16.00%
ARM | Confirming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 192,737	$ 260
ARM | Confirming | Product Concentration Risk | Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	2.00%	0.00%
ARM | Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 68,973	$ 45,243
ARM | Government | Product Concentration Risk | Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	1.00%	1.00%
Other - residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 1,659,792	$ 312,954
Other - residential mortgage loans | Product Concentration Risk | Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	19.00%	5.00%
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 2,020	$ 2,541
Consumer loans | Product Concentration Risk | Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	0.00%	0.00%

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