GOVERNMENT AND GOVERNMENT-BACKED SECURITIES - Summary of Real Estate and Other Securities for Held to Maturity (Details) $ in Thousands	3 Months Ended
Mar. 31, 2025 USD ($) security	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Outstanding Face Amount	$ 17,078,481	$ 15,878,274
Weighted Average Life (Years)	3 years 8 months 12 days
Residential Mortgage Backed Securities, Held To Maturity, Treasury
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Outstanding Face Amount	$ 25,000
Amortized Cost / Carrying Value	24,766	$ 24,770
Fair Value	24,767
Unrecognized Gains /(Losses)	$ 1
Number of Securities \| security	1
Weighted Average Yield	4.20%
Weighted Average Life (Years)	2 months 12 days

The weighted average yield received on servicer advances.

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Weighted average expected timing of the receipt of expected cash flows for this investment.

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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.

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Balance held at close of period in number of contracts.

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Amount of principal of investment owned.

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