Conservatorship, Senior Preferred Stock Purchase Agreement and Related Matters - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended
	Sep. 30, 2008	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 07, 2008
Related Parties [Line Items]
Net worth			$ 105,500
Senior preferred stock liquidation preference			223,135	$ 219,800	$ 212,029
Forecast
Related Parties [Line Items]
Senior preferred stock liquidation preference		$ 227,000
Series 2008-2 Senior Preferred Stock
Related Parties [Line Items]
Stock issued (in shares)	1
Related Party | US Treasury
Related Parties [Line Items]
Percentage of common shares attributable to warrants						79.90%
Common stock warrant exercise price (in dollars per share)						$ 0.00001
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement			119,800
Total available funding from US Treasury pursuant to the senior preferred stock agreement			$ 113,900