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Investments (Available-for-sale allowance for credit losses roll forward) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Allowance for Credit Losses, Period Beginning Balance $ 45,721 $ 9,724
Current provision for securities without prior allowance 3,730 18,588
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 8,318
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (13,259) 3,463
Reductions for securities sold (2,627) (1,395)
Reductions for securities identified as intent (or requirement) to sell during the period (11) (1,099)
Allowance for Credit Losses, Period Ending Balance 33,554 37,599
Foreign Government [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Allowance for Credit Losses, Period Beginning Balance 284 46
Current provision for securities without prior allowance 0 103
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (248) 1
Reductions for securities sold 0 0
Reductions for securities identified as intent (or requirement) to sell during the period 0 0
Allowance for Credit Losses, Period Ending Balance 36 150
Obligations of States and Political Subdivisions [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Allowance for Credit Losses, Period Beginning Balance 1,024 137
Current provision for securities without prior allowance 50 1,732
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (254) 132
Reductions for securities sold (83) (10)
Reductions for securities identified as intent (or requirement) to sell during the period 0 0
Allowance for Credit Losses, Period Ending Balance 737 1,991
Corporate Securities [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Allowance for Credit Losses, Period Beginning Balance 30,330 6,682
Current provision for securities without prior allowance 2,854 15,393
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (13,964) 3,337
Reductions for securities sold (2,453) (1,247)
Reductions for securities identified as intent (or requirement) to sell during the period (11) (1,099)
Allowance for Credit Losses, Period Ending Balance 16,756 23,066
Collateralized Loan Obligations and Other Asset Backed Securities [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Allowance for Credit Losses, Period Beginning Balance 2,375 939
Current provision for securities without prior allowance 787 1,288
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 736 59
Reductions for securities sold (3) (3)
Reductions for securities identified as intent (or requirement) to sell during the period 0 0
Allowance for Credit Losses, Period Ending Balance 3,895 2,283
Residential Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Allowance for Credit Losses, Period Beginning Balance 11,597 1,909
Current provision for securities without prior allowance 12 0
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 8,318
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 219 (63)
Reductions for securities sold (88) (135)
Reductions for securities identified as intent (or requirement) to sell during the period 0 0
Allowance for Credit Losses, Period Ending Balance 11,740 10,029
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Allowance for Credit Losses, Period Beginning Balance 111 11
Current provision for securities without prior allowance 27 72
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 252 (3)
Reductions for securities sold 0 0
Reductions for securities identified as intent (or requirement) to sell during the period 0 0
Allowance for Credit Losses, Period Ending Balance $ 390 $ 80