LOANS HELD FOR SALE, AT FAIR VALUE - Unpaid Principal Balance of LHFS by Loan Type (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 2,723,965	$ 2,597,757
Fair value adjustment	41,452	5,978
Loans held for sale, at fair value	$ 2,765,417	$ 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	$ 1,167,078	$ 1,185,638
Fixed \| Confirming \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	43.00%	46.00%
Fixed \| Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 984,313	$ 986,799
Fixed \| Government \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	36.00%	38.00%
ARM \| Confirming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 49,514	$ 41,661
ARM \| Confirming \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	2.00%	2.00%
ARM \| Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 46,907	$ 36,330
ARM \| Government \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	2.00%	1.00%
Other - residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 415,181	$ 288,480
Other - residential mortgage loans \| Product Concentration Risk \| Receivables Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	15.00%	11.00%
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 60,972	$ 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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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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