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Fair Value of Financial Instruments - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Point Noncontrolling Interest
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		$ 17,035
Acquisitions		0
Principal paydowns		0
Gains (losses) in net income (loss), net		7,320
Other settlements, net		0
Ending balance - September 30, 2022	$ 24,355	24,355
ABS Issued
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		8,843,147
Acquisitions		1,205,289
Principal paydowns		(1,242,859)
Gains (losses) in net income (loss), net		(1,241,265)
Other settlements, net		0
Ending balance - September 30, 2022	7,564,312	7,564,312
Residential Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		7,592,398
Acquisitions		3,585,882
Originations		0
Sales		(3,702,359)
Principal paydowns		(734,577)
Gains (losses) in net income (loss), net		(985,958)
Unrealized losses in OCI, net		0
Other settlements, net		(2,862)
Ending balance - September 30, 2022	5,752,524	5,752,524
Business purpose loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		4,790,989
Acquisitions		181,814
Originations		2,291,192
Sales		(414,998)
Principal paydowns		(1,086,983)
Gains (losses) in net income (loss), net		(503,832)
Unrealized losses in OCI, net		0
Other settlements, net		(964)
Ending balance - September 30, 2022	5,257,218	5,257,218
Consolidated Agency multifamily loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		473,514
Acquisitions		0
Originations		0
Sales		0
Principal paydowns		(5,936)
Gains (losses) in net income (loss), net		(40,120)
Unrealized losses in OCI, net		0
Other settlements, net		0
Ending balance - September 30, 2022	427,458	427,458
Trading Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		170,619
Acquisitions		5,006
Originations		0
Sales		(27,471)
Principal paydowns		(1,202)
Gains (losses) in net income (loss), net		(30,019)
Unrealized losses in OCI, net		0
Other settlements, net		0
Ending balance - September 30, 2022	116,933	116,933
AFS Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		206,792
Acquisitions		10,000
Originations		0
Sales		0
Principal paydowns		(25,381)
Gains (losses) in net income (loss), net		12,560
Unrealized losses in OCI, net		(61,692)
Other settlements, net		0
Ending balance - September 30, 2022	142,279	142,279
Servicer Advance Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		350,923
Acquisitions		0
Originations		0
Sales		0
Principal paydowns		(65,772)
Gains (losses) in net income (loss), net		(10,217)
Unrealized losses in OCI, net		0
Other settlements, net		0
Ending balance - September 30, 2022	274,934	274,934
Excess MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		44,231
Acquisitions		0
Originations		0
Sales		0
Principal paydowns		0
Gains (losses) in net income (loss), net		(3,779)
Unrealized losses in OCI, net		0
Other settlements, net		0
Ending balance - September 30, 2022	40,452	40,452
HEIs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		192,740
Acquisitions		176,439
Originations		0
Sales		0
Principal paydowns		(35,187)
Gains (losses) in net income (loss), net		6,445
Unrealized losses in OCI, net		0
Other settlements, net		0
Ending balance - September 30, 2022	340,437	340,437
MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		25,101
Acquisitions	0	8,293
Originations		0
Sales		(3,044)
Principal paydowns		(137)
Gains (losses) in net income (loss), net		9,336
Unrealized losses in OCI, net		0
Other settlements, net		(3,579)
Ending balance - September 30, 2022	35,970	35,970
Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		4,130
Acquisitions		0
Principal paydowns		0
Gains (losses) in net income (loss), net		(53,962)
Other settlements, net		(50,364)
Ending balance - September 30, 2022	$ 532	$ 532

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