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Investments (Available-for-sale allowance for credit losses roll forward) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period beginning balance $ 31,425 $ 50,800 $ 45,721 $ 9,724
Current provision for securities without prior allowance 2,206 4,484 7,107 36,582
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 262 (13) (15,032) 5,460
Reductions for securities sold (355) (2,871) (4,207) (6,480)
Reductions for securities identified as intent (or requirement) to sell during the period 0 (63) (51) (1,267)
Allowance for credit losses, period ending balance 33,538 52,337 33,538 52,337
Foreign Government [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period beginning balance 34 265 284 46
Current provision for securities without prior allowance 0 40 0 292
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) 15 (252) (4)
Reductions for securities sold 0 0 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 32 320 32 320
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 769 1,206 1,024 137
Current provision for securities without prior allowance 96 313 100 1,371
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 55 (181) (120) (6)
Reductions for securities sold (28) (27) (112) (191)
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0
Allowance for credit losses, period ending balance 892 1,311 892 1,311
Corporate Securities [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period beginning balance 16,149 35,072 30,330 6,682
Current provision for securities without prior allowance 1,939 4,061 6,078 33,096
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 (111) 633 (14,992) 4,384
Reductions for securities sold (212) (2,733) (3,600) (5,925)
Reductions for securities identified as intent (or requirement) to sell during the period 0 (63) (51) (1,267)
Allowance for credit losses, period ending balance 17,765 36,970 17,765 36,970
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 2,915 3,623 2,375 939
Current provision for securities without prior allowance 148 35 904 1,580
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 167 (527) (40) 623
Reductions for securities sold (12) (17) (21) (28)
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0
Allowance for credit losses, period ending balance 3,218 3,114 3,218 3,114
Residential Mortgage Backed Securities [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period beginning balance 11,550 10,616 11,597 1,909
Current provision for securities without prior allowance 23 35 24 225
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 154 46 334 473
Reductions for securities sold (102) (94) (330) (322)
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0
Allowance for credit losses, period ending balance 11,625 10,603 11,625 10,603
Commercial Mortgage Backed Securities [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period beginning balance 8 18 111 11
Current provision for securities without prior allowance 0 0 1 18
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) 1 38 (10)
Reductions for securities sold (1) 0 (144) 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 $ 6 $ 19 $ 6 $ 19