Mortgage-Backed Securities - Percentage of Non-Agency RMBS By Year Originated (Details) - Non-Agency RMBS	Jun. 30, 2026	Dec. 31, 2025
Origination Year as a Percentage of Outstanding Principal Balance:
Percentage of underlying mortgages, year originated	100.00%	100.00%
2003 and prior
Origination Year as a Percentage of Outstanding Principal Balance:
Percentage of underlying mortgages, year originated	1.20%	1.20%
2004
Origination Year as a Percentage of Outstanding Principal Balance:
Percentage of underlying mortgages, year originated	0.80%	0.80%
2005
Origination Year as a Percentage of Outstanding Principal Balance:
Percentage of underlying mortgages, year originated	7.60%	7.70%
2006
Origination Year as a Percentage of Outstanding Principal Balance:
Percentage of underlying mortgages, year originated	41.60%	41.50%
2007
Origination Year as a Percentage of Outstanding Principal Balance:
Percentage of underlying mortgages, year originated	36.40%	34.40%
2008 - 2023
Origination Year as a Percentage of Outstanding Principal Balance:
Percentage of underlying mortgages, year originated	9.60%	11.10%
2024 and later
Origination Year as a Percentage of Outstanding Principal Balance:
Percentage of underlying mortgages, year originated	2.80%	3.30%