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, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 2,562,538	$ 2,597,757
Fair value adjustment	43,823	5,978
Loans held for sale, at fair value	$ 2,606,361	$ 2,603,735
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	$ 1,003,172	$ 1,185,638
Fixed \| Confirming \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	39.00%	46.00%
Fixed \| Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 865,237	$ 986,799
Fixed \| Government \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	34.00%	38.00%
ARM \| Confirming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 114,717	$ 41,661
ARM \| Confirming \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	4.00%	2.00%
ARM \| Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 68,970	$ 36,330
ARM \| Government \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	3.00%	1.00%
Other - residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 454,024	$ 288,480
Other - residential mortgage loans \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	18.00%	11.00%
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 56,418	$ 58,849
HELOC \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	2.00%	2.00%

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