Fair Value - Key Inputs Used in Determining Fair Value of IO (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 3,765,539	$ 4,452,859
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value inputs, Prepayment speed	7.00%	7.00%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value inputs, Prepayment speed	25.60%	21.50%
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value inputs, Pricing spread	7.20%	8.40%
IO [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 71,429	$ 72,502
IO [Member] \| Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs Option-Adjusted Spread	3.80%	4.70%
Fair value inputs, Prepayment speed	10.80%	11.00%
Fair value inputs, Equivalent life (in years)	4 years	4 years
IO [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs Option-Adjusted Spread	4.20%	4.70%
Fair value inputs, Prepayment speed	13.30%	13.60%
Fair value inputs, Equivalent life (in years)	7 years 4 months 24 days	7 years 8 months 12 days
IO [Member] \| Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs Option-Adjusted Spread	3.80%	4.70%
Fair value inputs, Prepayment speed	10.80%	11.00%
Fair value inputs, Equivalent life (in years)	7 years 4 months 24 days	7 years 7 months 6 days