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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |  |
Allowance for credit losses, Period beginning balance | $ 37,599 | $ 8,781 | $ 9,724 | $ 3,969 |
Current provision for securities without prior allowance | 9,677 | 155 | 31,965 | 3,820 |
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 | 5,842 | (2,427) | 5,605 | (1,102) |
Reductions for securities sold | (2,213) | (437) | (3,608) | (615) |
Reductions for securities identified as intent (or requirement) to sell during the period | (105) | (61) | (1,204) | (61) |
Allowance for credit losses, Period ending balance | 50,800 | 6,011 | 50,800 | 6,011 |
Accrued investment income | 50,371 |  | 50,371 |  | $ 48,247
Available-for-sale Securities | Foreign Government [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |  |
Allowance for credit losses, Period beginning balance | 150 | 56 | 46 | 1 |
Current provision for securities without prior allowance | 117 | 0 | 236 | 49 |
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 | 12 | (7) | (3) | (1) |
Reductions for securities sold | (14) | 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 | 265 | 49 | 265 | 49 |
Available-for-sale Securities | 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 | 1,991 | 201 | 137 | 4 |
Current provision for securities without prior allowance | 534 | 0 | 1,237 | 25 |
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 | (1,166) | (163) | (4) | 9 |
Reductions for securities sold | (153) | 0 | (164) | 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 | 1,206 | 38 | 1,206 | 38 |
Available-for-sale Securities | Corporate Securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |  |
Allowance for credit losses, Period beginning balance | 23,066 | 6,166 | 6,682 | 2,782 |
Current provision for securities without prior allowance | 8,323 | 148 | 28,243 | 2,185 |
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 | 5,732 | (2,403) | 4,542 | (909) |
Reductions for securities sold | (1,944) | (373) | (3,191) | (520) |
Reductions for securities identified as intent (or requirement) to sell during the period | (105) | (61) | (1,204) | (61) |
Allowance for credit losses, Period ending balance | 35,072 | 3,477 | 35,072 | 3,477 |
Available-for-sale Securities | 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 | 2,283 | 1,470 | 939 | 592 |
Current provision for securities without prior allowance | 530 | 0 | 2,058 | 941 |
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 | 819 | (70) | 637 | (116) |
Reductions for securities sold | (9) | (1) | (11) | (18) |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 | 0 | 0 |
Allowance for credit losses, Period ending balance | 3,623 | 1,399 | 3,623 | 1,399 |
Available-for-sale Securities | Residential Mortgage Backed Securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |  |
Allowance for credit losses, Period beginning balance | 10,029 | 864 | 1,909 | 561 |
Current provision for securities without prior allowance | 173 | 3 | 174 | 618 |
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 | 507 | 230 | 443 | (68) |
Reductions for securities sold | (93) | (63) | (228) | (77) |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 | 0 | 0 |
Allowance for credit losses, Period ending balance | 10,616 | 1,034 | 10,616 | 1,034 |
Available-for-sale Securities | Commercial Mortgage Backed Securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |  |
Allowance for credit losses, Period beginning balance | 80 | 24 | 11 | 29 |
Current provision for securities without prior allowance | 0 | 4 | 17 | 2 |
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 | (62) | (14) | (10) | (17) |
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 | 18 | $ 14 | 18 | $ 14 |
Available-for-sale Securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |  |
Accrued investment income | $ 49,100 |  | $ 49,100 |  | $ 46,300

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