Fair Value of Financial Instruments Level 3 (Details)	Sep. 30, 2025	Dec. 31, 2024
Measurement Input, Constant Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Mortgage Loans, FV option, Measurement Input	0.10	0.10
Measurement Input, Default Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Mortgage Loans, FV option, Measurement Input	0.02	0.02
Measurement Input, Loss Severity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Mortgage Loans, FV option, Measurement Input	0.20	0.20
Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 Mortgage Loans, FV option, Measurement Input	0.10	0.10