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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, Period beginning balance $ 50,800 $ 6,011 $ 9,724 $ 3,969
Current provision for securities without prior allowance 4,484 1,666 36,582 5,139
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) (333) 5,460 (1,087)
Reductions for securities sold (2,871) (95) (6,480) (711)
Reductions for securities identified as intent (or requirement) to sell during the period (63) (80) (1,267) (141)
Allowance for credit losses, Period ending balance 52,337 7,169 52,337 7,169
Foreign Government [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, Period beginning balance 265 49 46 1
Current provision for securities without prior allowance 40 0 292 47
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 15 (2) (4) (1)
Reductions for securities sold 0 0 (14) 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 320 47 320 47
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 1,206 38 137 4
Current provision for securities without prior allowance 313 61 1,371 84
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 (181) 0 (6) 11
Reductions for securities sold (27) 0 (191) 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 1,311 99 1,311 99
Corporate Securities [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, Period beginning balance 35,072 3,477 6,682 2,782
Current provision for securities without prior allowance 4,061 1,307 33,096 3,413
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 633 64 4,384 (765)
Reductions for securities sold (2,733) (49) (5,925) (570)
Reductions for securities identified as intent (or requirement) to sell during the period (63) (80) (1,267) (141)
Allowance for credit losses, Period ending balance 36,970 4,719 36,970 4,719
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 3,623 1,399 939 592
Current provision for securities without prior allowance 35 46 1,580 573
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 (527) (517) 623 (219)
Reductions for securities sold (17) (2) (28) (20)
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0
Allowance for credit losses, Period ending balance 3,114 926 3,114 926
Residential Mortgage Backed Securities [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, Period beginning balance 10,616 1,034 1,909 561
Current provision for securities without prior allowance 35 248 225 1,018
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 46 125 473 (95)
Reductions for securities sold (94) (44) (322) (121)
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0
Allowance for credit losses, Period ending balance 10,603 1,363 10,603 1,363
Commercial Mortgage Backed Securities [Member]        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, Period beginning balance 18 14 11 29
Current provision for securities without prior allowance 0 4 18 4
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 1 (3) (10) (18)
Reductions for securities sold 0 0 0 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 $ 19 $ 15 $ 19 $ 15