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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	6 Months Ended
	Jun. 30, 2022	Jun. 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		6,218
Other settlements, net		0
Ending balance - June 30, 2022	$ 23,253	23,253
ABS Issued
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		8,843,147
Acquisitions		952,711
Principal paydowns		(925,650)
Gains (losses) in net income (loss), net		(876,255)
Other settlements, net		0
Ending balance - June 30, 2022	7,993,953	7,993,953
Residential Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		7,592,398
Acquisitions		3,247,960
Originations		0
Sales		(3,050,759)
Principal paydowns		(551,470)
Gains (losses) in net income (loss), net		(657,601)
Unrealized losses in OCI, net		0
Other settlements, net		(1,962)
Ending balance - June 30, 2022	6,578,566	6,578,566
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		122,065
Originations		1,721,032
Sales		(331,750)
Principal paydowns		(719,690)
Gains (losses) in net income (loss), net		(378,745)
Unrealized losses in OCI, net		0
Other settlements, net		(963)
Ending balance - June 30, 2022	5,202,938	5,202,938
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		(3,971)
Gains (losses) in net income (loss), net		(26,429)
Unrealized losses in OCI, net		0
Other settlements, net		0
Ending balance - June 30, 2022	443,114	443,114
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		(23,329)
Principal paydowns		(1,018)
Gains (losses) in net income (loss), net		(17,498)
Unrealized losses in OCI, net		0
Other settlements, net		0
Ending balance - June 30, 2022	133,780	133,780
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		(25,015)
Gains (losses) in net income (loss), net		11,730
Unrealized losses in OCI, net		(53,009)
Other settlements, net		0
Ending balance - June 30, 2022	150,498	150,498
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		(71,401)
Gains (losses) in net income (loss), net		(6,312)
Unrealized losses in OCI, net		0
Other settlements, net		0
Ending balance - June 30, 2022	273,210	273,210
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		(3,428)
Unrealized losses in OCI, net		0
Other settlements, net		0
Ending balance - June 30, 2022	40,803	40,803
HEIs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		192,740
Acquisitions		97,389
Originations		0
Sales		0
Principal paydowns		(25,826)
Gains (losses) in net income (loss), net		12,063
Unrealized losses in OCI, net		0
Other settlements, net		0
Ending balance - June 30, 2022	276,366	276,366
MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2021		25,101
Acquisitions	3,000	8,293
Originations		0
Sales		(2,231)
Principal paydowns		(30)
Gains (losses) in net income (loss), net		6,875
Unrealized losses in OCI, net		0
Other settlements, net		(3,579)
Ending balance - June 30, 2022	34,429	34,429
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		(51,265)
Other settlements, net		(48,615)
Ending balance - June 30, 2022	$ 1,480	$ 1,480

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