Commitments and Contingencies - Contractual Commitments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Agency Business Commitments
Cash collateral per securitization	$ 5,000		$ 5,000
Outstanding letters of credit	5,000		5,000
Debt Obligations
2023 (three months ending December 31, 2023)	858,768		858,768
2024	2,004,350		2,004,350
2025	3,378,563		3,378,563
2026	4,523,241		4,523,241
2027	1,115,231		1,115,231
2028	180,000		180,000
Thereafter	154,336		154,336
Total	12,214,489		12,214,489
Minimum Annual Operating Lease Payments
2023 (three months ending December 31, 2023)	2,300		2,300
2024	10,188		10,188
2025	10,555		10,555
2026	10,627		10,627
2027	9,225		9,225
2028	8,624		8,624
Thereafter	27,755		27,755
Total	79,274		79,274
Total
2023 (three months ending December 31, 2023)	861,068		861,068
2024	2,014,538		2,014,538
2025	3,389,118		3,389,118
2026	4,533,868		4,533,868
2027	1,124,456		1,124,456
2028	188,624		188,624
Thereafter	182,091		182,091
Total	12,293,763		12,293,763
Operating lease expense	2,800	$ 2,400	8,000	$ 7,200
Fannie Mae Mortgage
Agency Business Commitments
Minimum liquid assets to be maintained to meet operational liquidity requirements	19,800		$ 19,800
Period of funding for collateral requirement			48 months
Letter of credit required	72,600		$ 72,600
Letter of credit assigned	64,000		64,000
Reserve required to fund additional restricted liquidity over the next 48 months	$ 37,300		$ 37,300
Period of additional funding for collateral requirement			48 months
Forward Contracts
Agency Business Commitments
Period of contractual commitment			60 days

The additional reserve required to fund the restricted liquidity requirement.

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Funding period for the additional reserve required to fund the restricted liquidity requirement.

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Required amount of cash collateral held for each securitization.

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The amount of letter of credit assigned to meet the restricted liquidity requirement.

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The amount of the letter of credit assigned to meet the restricted liquidity required.

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The minimum liquid assets required to be maintained by the entity to meet operational liquidity requirements as of the balance sheet date.

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in remainder of current fiscal year.

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The period over which the collateral requirement for loans will be funded.

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Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

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Amount of contractual obligation to be paid in remainder of current fiscal year.

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Amount of lessee's undiscounted obligation for lease payment for operating lease.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of operating lease expense. Excludes sublease income.

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