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Investments (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Impairment on fixed maturities     $ 0 $ 0 $ 0
Amortized cost $ 3,200,000   3,200,000   3,000,000.0
Fair value 3,300,000   3,300,000   3,000,000.0
Mortgage backed and asset backed securities at fair value 7,700,000   7,700,000    
Mortgage servicing rights MSR impairment recovery     500,000    
Valuation allowances on mortgage loans         $ 0
Proceeds from sales of available-for-sale investments 94,000,000.0 $ 70,900,000 187,600,000 132,800,000  
Gross realized gain 100,000 1,300,000 1,500,000 1,900,000  
Gross realized losses $ 1,200,000 $ 300,000 $ 1,700,000 $ 500,000  
Mortgage Loans Secured by Property | Delaware | Geographic Concentration Risk [Member]          
Concentration risk percentage     40.00%   34.00%
Mortgage Loans Secured by Property | New York | Geographic Concentration Risk [Member]          
Concentration risk percentage     27.00%   32.00%
Mortgage Loans Secured by Property | Arizona | Geographic Concentration Risk [Member]          
Concentration risk percentage     5.00%   4.00%
Mortgage Loans Secured by Property | Maine | Geographic Concentration Risk [Member]          
Concentration risk percentage     4.00%    
Mortgage Loans Secured by Property | California | Geographic Concentration Risk [Member]          
Concentration risk percentage         4.00%
Mortgage Loans Secured by Property | Non-US | Geographic Concentration Risk [Member]          
Concentration risk percentage     10.00%   9.00%