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Summary of Significant Accounting Policies Regulatory Capital (Details) - USD ($)
shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Capital Reserve Amount, Fiscal Year, Senior Preferred Stock Purchase Agreement, September 2019 Amendment [Line Items]      
Deficit of core capital over statutory minimum capital requirement $ (128,100)   $ (128,800)
Weighted Average Number of Shares, Contingently Issuable 4,700,000 4,600,000