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Investments (Available-for-sale allowance for credit losses roll forward) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance $ 9,724 $ 3,969
Current provision for securities without prior allowance 34,561 8,135
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 8,318  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 4,608 (1,284)
Reduction for securities sold (7,636) (926)
Reduction for securities identified as intent (or requirement) to sell during the period (3,854) (170)
Allowance for credit losses, ending balance 45,721 9,724
Foreign Government [Member]    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance 46 1
Current provision for securities without prior allowance 291 46
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 4 (1)
Reduction for securities sold (57) 0
Reduction for securities identified as intent (or requirement) to sell during the period 0 0
Allowance for credit losses, ending balance 284 46
Obligations of States and Political Subdivisions [Member]    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance 137 4
Current provision for securities without prior allowance 1,087 122
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (6) 11
Reduction for securities sold (194) 0
Reduction for securities identified as intent (or requirement) to sell during the period 0 0
Allowance for credit losses, ending balance 1,024 137
Corporate Securities [Member]    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance 6,682 2,782
Current provision for securities without prior allowance 30,670 5,785
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 3,714 (992)
Reduction for securities sold (6,902) (723)
Reduction for securities identified as intent (or requirement) to sell during the period (3,834) (170)
Allowance for credit losses, ending balance 30,330 6,682
Collateralized Loan Obligations and Other Asset-Backed Securities [Member]    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance 939 592
Current provision for securities without prior allowance 2,158 579
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (652) (211)
Reduction for securities sold (50) (21)
Reduction for securities identified as intent (or requirement) to sell during the period (20) 0
Allowance for credit losses, ending balance 2,375 939
Residential Mortgage Backed Securities [Member]    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance 1,909 561
Current provision for securities without prior allowance 245 1,593
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 8,318  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 1,558 (63)
Reduction for securities sold (433) (182)
Reduction for securities identified as intent (or requirement) to sell during the period 0 0
Allowance for credit losses, ending balance 11,597 1,909
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance 11 29
Current provision for securities without prior allowance 110 10
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (10) (28)
Reduction for securities sold 0 0
Reduction for securities identified as intent (or requirement) to sell during the period 0 0
Allowance for credit losses, ending balance $ 111 $ 11