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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

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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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