Derivative Financial Instruments - Offsetting of Derivative Assets - Derivative Liabilities, Financial Liabilities, and Collateral Held by Counterparty (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	$ 6,433,125	$ 3,822,724
Financial instruments	(6,414,295)	(3,769,449)
Net amount of liabilities in the consolidated balance sheet	18,830	53,275
Bank of America, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,361,493	875,766
Financial instruments	(1,356,068)	(872,148)
Net amount of liabilities in the consolidated balance sheet	5,425	3,618
Atlas Securitized Products, L.P.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	842,936	1,210,473
Financial instruments	(842,936)	(1,210,473)
JP Morgan
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	637,541	243,225
Financial instruments	(637,229)	(243,225)
Net amount of liabilities in the consolidated balance sheet	312
BNP Paribas
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	593,008	185,425
Financial instruments	(593,008)	(185,425)
Royal Bank of Canada
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	592,365	457,743
Financial instruments	(592,365)	(457,743)
Morgan Stanley Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	535,921	195,714
Financial instruments	(534,357)	(164,149)
Net amount of liabilities in the consolidated balance sheet	1,564	31,565
Barclays
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	311,140	128,488
Financial instruments	(311,140)	(118,667)
Net amount of liabilities in the consolidated balance sheet		9,821
Goldman Sachs
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	273,478	178,751
Financial instruments	(273,478)	(178,751)
Santander US Capital Markets LLC
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	269,656
Financial instruments	(269,361)
Net amount of liabilities in the consolidated balance sheet	295
Citibank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	242,809	174,221
Financial instruments	(237,300)	(174,221)
Net amount of liabilities in the consolidated balance sheet	5,509
Athene Annuity & Life Assurance Company
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet		2,111
Net amount of liabilities in the consolidated balance sheet		2,111
Federal National Mortgage Association
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	275	1,337
Net amount of liabilities in the consolidated balance sheet	275	1,337
Other
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,507	2,475
Net amount of liabilities in the consolidated balance sheet	1,507	2,475
Wells Fargo Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	667,053	116,275
Financial instruments	(667,053)	(114,647)
Net amount of liabilities in the consolidated balance sheet		1,628
Nomura
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	100,013	50,000
Financial instruments	(100,000)	(50,000)
Net amount of liabilities in the consolidated balance sheet	13
Interest rate lock commitments
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	3,930	720
Net amount of liabilities in the consolidated balance sheet	$ 3,930	$ 720