v3.26.3
Debt and Equity Securities - Weighted Average Yields for Available-for-Sale Debt Securities (Details)
Sep. 30, 2026
Residential mortgage-backed securities  
Debt Securities, Available-for-sale [Line Items]  
Due within one year 0.00%
Due after one year through five years 0.00%
Due after five years through ten years 3.91%
Due after ten years 4.81%
Total 4.81%
Commercial mortgage-backed securities  
Debt Securities, Available-for-sale [Line Items]  
Due within one year 0.00%
Due after one year through five years 0.00%
Due after five years through ten years 4.80%
Due after ten years 0.00%
Total 4.80%
Credit risk transfer securities  
Debt Securities, Available-for-sale [Line Items]  
Due within one year 0.00%
Due after one year through five years 4.01%
Due after five years through ten years 0.00%
Due after ten years 0.00%
Total 4.01%