Derivative Activities - Offsetting of Derivative Assets - Derivative Liabilities, Financial Liabilities, and Collateral Held by Counterparty (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	$ 3,822,724	$ 3,026,402
Financial instruments	(3,769,449)	(3,004,690)
Net amount of liabilities in the consolidated balance sheet	53,275	21,712
Atlas Securitized Products, L.P.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,210,473
Financial instruments	(1,210,473)
Credit Suisse First Boston Mortgage Capital LLC
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet		970,725
Financial instruments		(968,804)
Net amount of liabilities in the consolidated balance sheet		1,921
JP Morgan
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	243,225	211,713
Financial instruments	(243,225)	(211,713)
Bank of America, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	875,766	567,745
Financial instruments	(872,148)	(567,745)
Net amount of liabilities in the consolidated balance sheet	3,618
Barclays
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	128,488	80,276
Financial instruments	(118,667)	(79,295)
Net amount of liabilities in the consolidated balance sheet	9,821	981
Citibank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	174,221	94,211
Financial instruments	(174,221)	(94,211)
Royal Bank of Canada
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	457,743	381,893
Financial instruments	(457,743)	(381,893)
BNP Paribas
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	185,425	300,280
Financial instruments	(185,425)	(300,280)
Morgan Stanley Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	195,714	114,277
Financial instruments	(164,149)	(114,277)
Net amount of liabilities in the consolidated balance sheet	31,565
Wells Fargo Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	116,275	228,181
Financial instruments	(114,647)	(221,986)
Net amount of liabilities in the consolidated balance sheet	1,628	6,195
Federal National Mortgage Association
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,337	211
Net amount of liabilities in the consolidated balance sheet	1,337	211
Goldman Sachs
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	178,751	64,486
Financial instruments	(178,751)	(64,486)
Nomura
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	50,000
Financial instruments	(50,000)
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
Other
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	2,475	1,520
Net amount of liabilities in the consolidated balance sheet	2,475	1,520
Interest rate lock commitments
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	720	10,884
Net amount of liabilities in the consolidated balance sheet	$ 720	$ 10,884