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Debt (Narrative) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
extensionTerm
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Disclosure [Abstract]      
Federal Home Loan Bank stock   $ 5,000,000  
Federal Home Loan Bank, advances, general debt obligations, maximum amount available   106,000,000  
Federal Home Loan Bank, advances, branch of FHLB Bank, amount of advances   0 $ 0
Debt instrument, term 5 years    
Line of credit, current borrowing capacity $ 250,000,000    
Additional borrowing capacity available $ 100,000,000    
Number of extension options | extensionTerm 2    
Extension term 1 year    
Line of credit, minimum net worth required for compliance   8,700,000,000  
Line of credit, amount outstanding   $ 0 $ 0