Derivative Financial Instruments - Offsetting of Derivative Assets - Derivative Liabilities, Financial Liabilities, and Collateral Held by Counterparty (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	$ 5,481,910	$ 3,822,724
Financial instruments	(5,441,126)	(3,769,449)
Net amount of liabilities in the consolidated balance sheet	40,784	53,275
Atlas Securitized Products, L.P.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,203,385	1,210,473
Financial instruments	(1,203,385)	(1,210,473)
JP Morgan
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	412,478	243,225
Financial instruments	(412,448)	(243,225)
Net amount of liabilities in the consolidated balance sheet	30
Bank of America, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,087,182	875,766
Financial instruments	(1,086,753)	(872,148)
Net amount of liabilities in the consolidated balance sheet	429	3,618
Barclays
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	197,489	128,488
Financial instruments	(196,316)	(118,667)
Net amount of liabilities in the consolidated balance sheet	1,173	9,821
Santander US Capital Markets LLC
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	195,541
Financial instruments	(195,307)
Net amount of liabilities in the consolidated balance sheet	234
Citibank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	293,885	174,221
Financial instruments	(293,885)	(174,221)
Royal Bank of Canada
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	666,511	457,743
Financial instruments	(666,511)	(457,743)
BNP Paribas
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	322,871	185,425
Financial instruments	(322,871)	(185,425)
Morgan Stanley Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	227,757	195,714
Financial instruments	(223,410)	(164,149)
Net amount of liabilities in the consolidated balance sheet	4,347	31,565
Wells Fargo Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	443,386	116,275
Financial instruments	(416,035)	(114,647)
Net amount of liabilities in the consolidated balance sheet	27,351	1,628
Federal National Mortgage Association
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	189	1,337
Net amount of liabilities in the consolidated balance sheet	189	1,337
Goldman Sachs
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	299,387	178,751
Financial instruments	(299,205)	(178,751)
Net amount of liabilities in the consolidated balance sheet	182
Nomura
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	125,036	50,000
Financial instruments	(125,000)	(50,000)
Net amount of liabilities in the consolidated balance sheet	36
Athene Annuity & Life Assurance Company
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	661	2,111
Net amount of liabilities in the consolidated balance sheet	661	2,111
Other
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,415	2,475
Net amount of liabilities in the consolidated balance sheet	1,415	2,475
Interest rate lock commitments
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	4,737	720
Net amount of liabilities in the consolidated balance sheet	$ 4,737	$ 720