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Subordinated Debentures (Summary of Subordinated Debt Obligations to the Trusts) (Details) - Subordinated Debentures - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Subordinated Borrowing [Line Items]    
Subordinated debentures, gross $ 159,272 $ 78,112
Unamortized debt issue costs (2,007) 0
Subordinated debentures 157,265 78,112
American Equity Capital Trust II    
Subordinated Borrowing [Line Items]    
Subordinated debentures, gross 77,822 $ 78,112
Interest rate   5.00%
American Equity Capital Trust III    
Subordinated Borrowing [Line Items]    
Subordinated debentures, gross $ 27,840 $ 0
Basis spread on variable rate 3.90%  
American Equity Capital Trust IV    
Subordinated Borrowing [Line Items]    
Subordinated debentures, gross $ 12,372 0
Basis spread on variable rate 4.00%  
American Equity Capital Trust XII    
Subordinated Borrowing [Line Items]    
Subordinated debentures, gross $ 41,238 $ 0
Basis spread on variable rate 3.50%