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Investments (Available-for-sale allowance for credit losses roll forward) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for Credit Losses, Period Beginning Balance $ 33,554 $ 37,599 $ 45,721 $ 9,724
Current provision for securities without prior allowance 2,128 9,677 4,894 31,965
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0 0 8,318
Increase (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (2,992) 5,842 (15,287) 5,605
Reductions for securities sold (1,229) (2,213) (3,852) (3,608)
Reductions for securities identified as intent (or requirement) to sell during the period (36) (105) (51) (1,204)
Allowance for Credit Losses, Period Ending Balance 31,425 50,800 31,425 50,800
Foreign Government [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for Credit Losses, Period Beginning Balance 36 150 284 46
Current provision for securities without prior allowance 0 117 0 236
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0 0 0
Increase (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (2) 12 (250) (3)
Reductions for securities sold 0 (14) 0 (14)
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0
Allowance for Credit Losses, Period Ending Balance 34 265 34 265
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 737 1,991 1,024 137
Current provision for securities without prior allowance 67 534 67 1,237
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0 0 0
Increase (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (35) (1,166) (239) (4)
Reductions for securities sold 0 (153) (83) (164)
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0
Allowance for Credit Losses, Period Ending Balance 769 1,206 769 1,206
Corporate Securities [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for Credit Losses, Period Beginning Balance 16,756 23,066 30,330 6,682
Current provision for securities without prior allowance 1,438 8,323 4,141 28,243
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0 0 0
Increase (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (1,070) 5,732 (14,884) 4,542
Reductions for securities sold (939) (1,944) (3,387) (3,191)
Reductions for securities identified as intent (or requirement) to sell during the period (36) (105) (51) (1,204)
Allowance for Credit Losses, Period Ending Balance 16,149 35,072 16,149 35,072
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 3,895 2,283 2,375 939
Current provision for securities without prior allowance 622 530 677 2,058
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0 0 0
Increase (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (1,595) 819 (127) 637
Reductions for securities sold (7) (9) (10) (11)
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0
Allowance for Credit Losses, Period Ending Balance 2,915 3,623 2,915 3,623
Residential Mortgage Backed Securities [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for Credit Losses, Period Beginning Balance 11,740 10,029 11,597 1,909
Current provision for securities without prior allowance 1 173 8 174
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0 0 8,318
Increase (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (50) 507 174 443
Reductions for securities sold (141) (93) (229) (228)
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0
Allowance for Credit Losses, Period Ending Balance 11,550 10,616 11,550 10,616
Commercial Mortgage Backed Securities [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for Credit Losses, Period Beginning Balance 390 80 111 11
Current provision for securities without prior allowance 0 0 1 17
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0 0 0
Increase (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (240) (62) 39 (10)
Reductions for securities sold (142) 0 (143) 0
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0
Allowance for Credit Losses, Period Ending Balance $ 8 $ 18 $ 8 $ 18