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, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 2,816,701	$ 7,979,226
Fair value adjustment	(123,881)	157,591
Total	$ 2,692,820	$ 8,136,817
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	$ 1,696,438	$ 4,881,222
Fixed \| Confirming \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	60.00%	61.00%
Fixed \| Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 895,256	$ 1,156,890
Fixed \| Government \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	32.00%	15.00%
ARM \| Confirming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 33,501	$ 351,408
ARM \| Confirming \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	1.00%	4.00%
ARM \| Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 2,509	$ 10,906
ARM \| Government \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	0.00%	0.00%
Other - residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 187,200	$ 1,576,858
Other - residential mortgage loans \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	7.00%	20.00%
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 1,797	$ 1,942
Consumer loans \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	0.00%	0.00%

Loans Held-For-Sale, Fair Value Cumulative Adjustment Gain (Loss)

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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-Publisher FASB
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- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

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- Definition

Amount, before valuation allowance, of financing receivable classified as held-for-sale.

+ References

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-Publisher FASB
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