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Investments (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments Debt And Equity Securities [Abstract] |
Schedule of Disposition of Fixed Income and Equity Securities |
Sales |  | Proceeds |  |  | Gross Realized |  |  | Net Realized |
(in thousands) |  | From Sales |  |  | Gains |  |  | Losses |  |  | Gain (Loss) |
2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities - available-for-sale |  | $ | 19,390 |  |  | $ | 215 |  |  | $ | (432 | ) |  | $ | (217 | )
Equity securities |  |  | 53,525 |  |  |  | 19,244 |  |  |  | (15 | ) |  |  | 19,229 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities - available-for-sale |  | $ | 31,928 |  |  | $ | 1,252 |  |  | $ | (46 | ) |  | $ | 1,206 |
Equity securities |  |  | 152,170 |  |  |  | 50,656 |  |  |  | (1,784 | ) |  |  | 48,872 |
Calls/Maturities |  |  |  |  |  | Gross Realized |  |  | Net Realized |
(in thousands) |  | Proceeds |  |  | Gains |  |  | Losses |  |  | Gain (Loss) |
2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities - available-for-sale |  | $ | 137,499 |  |  | $ | 76 |  |  | $ | (55 | ) |  | $ | 21 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities - available-for-sale |  | $ | 204,960 |  |  | $ | 406 |  |  | $ | (63 | ) |  | $ | 343 |
Fair Value, Assets Measured on Recurring Basis | Assets measured at fair value on a recurring basis as of June 30, 2022 and December 31, 2021 are summarized below:
| As of June 30, 2022 |
|  | Quoted Prices in |  |  | Significant Other |  |  | Significant |  |  |  |  |
|  | Active Markets for |  |  | Observable |  |  | Unobservable |  |  |  |  |
|  | Identical Assets |  |  | Inputs |  |  | Inputs |  |  |  |  |
(in thousands) |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
Fixed income securities - available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government |  | $ | — |  |  | $ | 181,678 |  |  | $ | — |  |  | $ | 181,678 |
U.S. agency |  |  | — |  |  |  | 33,573 |  |  |  | — |  |  |  | 33,573 |
Non-U.S. government & agency |  |  | — |  |  |  | 6,068 |  |  |  | — |  |  |  | 6,068 |
Agency MBS |  |  | — |  |  |  | 312,721 |  |  |  | — |  |  |  | 312,721 |
ABS/CMBS/MBS* |  |  | — |  |  |  | 246,345 |  |  |  | — |  |  |  | 246,345 |
Corporate |  |  | — |  |  |  | 886,114 |  |  |  | 55,615 |  |  |  | 941,729 |
Municipal |  |  | — |  |  |  | 558,795 |  |  |  | — |  |  |  | 558,795 |
Total fixed income securities - available-for-sale |  | $ | — |  |  | $ | 2,225,294 |  |  | $ | 55,615 |  |  | $ | 2,280,909 |
Equity securities |  |  | 486,780 |  |  |  | 42 |  |  |  | 1,173 |  |  |  | 487,995 |
Total |  | $ | 486,780 |  |  | $ | 2,225,336 |  |  | $ | 56,788 |  |  | $ | 2,768,904 |
* | Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities
| As of December 31, 2021 |
|  | Quoted Prices in |  |  | Significant Other |  |  | Significant |  |  |  |  |
|  | Active Markets for |  |  | Observable |  |  | Unobservable |  |  |  |  |
|  | Identical Assets |  |  | Inputs |  |  | Inputs |  |  |  |  |
(in thousands) |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
Fixed income securities - available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government |  | $ | — |  |  | $ | 134,554 |  |  | $ | — |  |  | $ | 134,554 |
U.S. agency |  |  | — |  |  |  | 32,760 |  |  |  | — |  |  |  | 32,760 |
Non-U.S. government & agency |  |  | — |  |  |  | 8,481 |  |  |  | — |  |  |  | 8,481 |
Agency MBS |  |  | — |  |  |  | 367,187 |  |  |  | — |  |  |  | 367,187 |
ABS/CMBS/MBS* |  |  | — |  |  |  | 264,054 |  |  |  | — |  |  |  | 264,054 |
Corporate |  |  | — |  |  |  | 913,577 |  |  |  | 43,518 |  |  |  | 957,095 |
Municipal |  |  | — |  |  |  | 645,756 |  |  |  | — |  |  |  | 645,756 |
Total fixed income securities - available-for-sale |  | $ | — |  |  | $ | 2,366,369 |  |  | $ | 43,518 |  |  | $ | 2,409,887 |
Equity securities |  |  | 613,712 |  |  |  | 64 |  |  |  | — |  |  |  | 613,776 |
Total |  | $ | 613,712 |  |  | $ | 2,366,433 |  |  | $ | 43,518 |  |  | $ | 3,023,663 |
* | Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities
Summary of Changes in Balance of Level 3 Securities |
(in thousands) |  | Level 3 Securities |
Balance as of January 1, 2022 |  | $ | 43,518 |
Net realized and unrealized gains (losses) |  |  |  |
Included in net earnings as a part of: |  |  |  |
Net investment income |  |  | (506 | )
Net realized gains |  |  | (433 | )
Included in other comprehensive earnings (loss) |  |  | (6,623 | )
Total net realized and unrealized gains (losses) |  | $ | (7,562 | )
Purchases |  |  | 21,701 |
Transfers out of Level 3 |  |  | (869 | )
Balance as of June 30, 2022 |  | $ | 56,788 |
Change in unrealized gains (losses) during the period for Level 3 assets held at period-end - included in net realized gains |  | $ | (433 | )
Change in unrealized gains (losses) during the period for Level 3 assets held at period-end - included in other comprehensive earnings (loss) |  | $ | (6,623 | )
Schedule of Contractual Maturity of Securities |
|  | June 30, 2022 |
(in thousands) |  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 48,305 |  |  | $ | 48,372 |
Due after one year through five years |  |  | 790,904 |  |  |  | 765,266 |
Due after five years through 10 years |  |  | 516,860 |  |  |  | 477,956 |
Due after 10 years |  |  | 514,144 |  |  |  | 430,249 |
ABS/CMBS/MBS* |  |  | 610,267 |  |  |  | 559,066 |
Total available-for-sale |  | $ | 2,480,480 |  |  | $ | 2,280,909 |
* | Asset-backed, commercial mortgage-backed and mortgage-backed securities
Schedule of Amortized Cost and Fair Value of Available-for-sale Securities | The amortized cost and fair value of available-for-sale securities at June 30, 2022 and December 31, 2021 are presented in the tables below. Amortized cost does not include the $17.5 million and $16.4 million of accrued interest receivable as of June 30, 2022 and December 31, 2021, respectively.
|  | June 30, 2022 |
|  | Cost or |  |  | Allowance |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | for Credit |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(in thousands) |  | Cost |  |  | Losses |  |  | Gains |  |  | Losses |  |  | Value |
U.S. government |  | $ | 183,368 |  |  | $ | — |  |  | $ | 220 |  |  | $ | (1,910 | ) |  | $ | 181,678 |
U.S. agency |  |  | 34,220 |  |  |  | — |  |  |  | 190 |  |  |  | (837 | ) |  |  | 33,573 |
Non-U.S. government & agency |  |  | 6,797 |  |  |  | — |  |  |  | - |  |  |  | (729 | ) |  |  | 6,068 |
Agency MBS |  |  | 338,639 |  |  |  | — |  |  |  | 591 |  |  |  | (26,509 | ) |  |  | 312,721 |
ABS/CMBS/MBS* |  |  | 271,628 |  |  |  | (10 | ) |  |  | 82 |  |  |  | (25,355 | ) |  |  | 246,345 |
Corporate |  |  | 1,011,726 |  |  |  | (282 | ) |  |  | 428 |  |  |  | (70,143 | ) |  |  | 941,729 |
Municipal |  |  | 634,102 |  |  |  | — |  |  |  | 1,860 |  |  |  | (77,167 | ) |  |  | 558,795 |
Total Fixed Income |  | $ | 2,480,480 |  |  | $ | (292 | ) |  | $ | 3,371 |  |  | $ | (202,650 | ) |  | $ | 2,280,909 |
|  | December 31, 2021 |
|  | Cost or |  |  | Allowance |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | for Credit |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(in thousands) |  | Cost |  |  | Losses |  |  | Gains |  |  | Losses |  |  | Value |
U.S. government |  | $ | 127,752 |  |  | $ | — |  |  | $ | 6,846 |  |  | $ | (44 | ) |  | $ | 134,554 |
U.S. agency |  |  | 30,403 |  |  |  | — |  |  |  | 2,374 |  |  |  | (17 | ) |  |  | 32,760 |
Non-U.S. government & agency |  |  | 8,297 |  |  |  | — |  |  |  | 338 |  |  |  | (154 | ) |  |  | 8,481 |
Agency MBS |  |  | 362,861 |  |  |  | — |  |  |  | 9,277 |  |  |  | (4,951 | ) |  |  | 367,187 |
ABS/CMBS/MBS* |  |  | 264,273 |  |  |  | — |  |  |  | 2,120 |  |  |  | (2,339 | ) |  |  | 264,054 |
Corporate |  |  | 925,394 |  |  |  | (441 | ) |  |  | 37,247 |  |  |  | (5,105 | ) |  |  | 957,095 |
Municipal |  |  | 627,287 |  |  |  | — |  |  |  | 22,750 |  |  |  | (4,281 | ) |  |  | 645,756 |
Total Fixed Income |  | $ | 2,346,267 |  |  | $ | (441 | ) |  | $ | 80,952 |  |  | $ | (16,891 | ) |  | $ | 2,409,887 |
* | Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities
Schedule of Debt Securities Available-for-sale Allowance for Credit Loss |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(in thousands) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Beginning balance |  | $ | 594 |  |  | $ | 375 |  |  | $ | 441 |  |  | $ | 397 |
Increase to allowance from securities for which credit losses were not previously recorded |  |  | 149 |  |  |  | - |  |  |  | 223 |  |  |  | - |
Reduction from securities sold during the period |  |  | (433 | ) |  |  | - |  |  |  | (433 | ) |  |  |  |
Reductions from intent to sell securities |  |  | - |  |  |  | - |  |  |  | (17 | ) |  |  | - |
Net increase (decrease) from securities that had an allowance at the beginning of the period |  |  | (18 | ) |  |  | (171 | ) |  |  | 78 |  |  |  | (193 | )
Balance as of June 30, |  | $ | 292 |  |  | $ | 204 |  |  | $ | 292 |  |  | $ | 204 |
Schedule of Securities in an Unrealized Loss Position Segregated by Type and Length of Time in an Unrealized Loss Position |
|  | June 30, 2022 |  |  | December 31, 2021 |
(in thousands) |  | < 12 Mos. |  |  | 12 Mos. & Greater |  |  | Total |  |  | < 12 Mos. |  |  | 12 Mos. & Greater |  |  | Total |
U.S. government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value |  | $ | 142,944 |  |  | $ | — |  |  | $ | 142,944 |  |  | $ | 2,942 |  |  | $ | — |  |  | $ | 2,942 |
Amortized cost |  |  | 144,854 |  |  |  | — |  |  |  | 144,854 |  |  |  | 2,986 |  |  |  | — |  |  |  | 2,986 |
Unrealized loss |  | $ | (1,910 | ) |  | $ | — |  |  | $ | (1,910 | ) |  | $ | (44 | ) |  | $ | — |  |  | $ | (44 | )
U.S. agency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value |  | $ | 15,788 |  |  | $ | — |  |  | $ | 15,788 |  |  | $ | 1,498 |  |  | $ | — |  |  | $ | 1,498 |
Amortized cost |  |  | 16,625 |  |  |  | — |  |  |  | 16,625 |  |  |  | 1,515 |  |  |  | — |  |  |  | 1,515 |
Unrealized loss |  | $ | (837 | ) |  | $ | — |  |  | $ | (837 | ) |  | $ | (17 | ) |  | $ | — |  |  | $ | (17 | )
Non-U.S. government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value |  | $ | 3,731 |  |  | $ | 2,337 |  |  | $ | 6,068 |  |  | $ | 4,346 |  |  | $ | — |  |  | $ | 4,346 |
Amortized cost |  |  | 3,797 |  |  |  | 3,000 |  |  |  | 6,797 |  |  |  | 4,500 |  |  |  | — |  |  |  | 4,500 |
Unrealized Loss |  | $ | (66 | ) |  | $ | (663 | ) |  | $ | (729 | ) |  | $ | (154 | ) |  | $ | — |  |  | $ | (154 | )
Agency MBS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value |  | $ | 221,563 |  |  | $ | 68,070 |  |  | $ | 289,633 |  |  | $ | 102,145 |  |  | $ | 62,669 |  |  | $ | 164,814 |
Amortized cost |  |  | 236,671 |  |  |  | 79,471 |  |  |  | 316,142 |  |  |  | 104,336 |  |  |  | 65,429 |  |  |  | 169,765 |
Unrealized loss |  | $ | (15,108 | ) |  | $ | (11,401 | ) |  | $ | (26,509 | ) |  | $ | (2,191 | ) |  | $ | (2,760 | ) |  | $ | (4,951 | )
ABS/CMBS/MBS* |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value |  | $ | 214,266 |  |  | $ | 22,312 |  |  | $ | 236,578 |  |  | $ | 150,997 |  |  | $ | 3,935 |  |  | $ | 154,932 |
Amortized cost |  |  | 236,298 |  |  |  | 25,635 |  |  |  | 261,933 |  |  |  | 153,235 |  |  |  | 4,036 |  |  |  | 157,271 |
Unrealized loss |  | $ | (22,032 | ) |  | $ | (3,323 | ) |  | $ | (25,355 | ) |  | $ | (2,238 | ) |  | $ | (101 | ) |  | $ | (2,339 | )
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value |  | $ | 762,770 |  |  | $ | 78,901 |  |  | $ | 841,671 |  |  | $ | 217,791 |  |  | $ | 53,818 |  |  | $ | 271,609 |
Amortized cost |  |  | 821,145 |  |  |  | 90,669 |  |  |  | 911,814 |  |  |  | 221,010 |  |  |  | 55,704 |  |  |  | 276,714 |
Unrealized loss |  | $ | (58,375 | ) |  | $ | (11,768 | ) |  | $ | (70,143 | ) |  | $ | (3,219 | ) |  | $ | (1,886 | ) |  | $ | (5,105 | )
Municipal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value |  | $ | 387,833 |  |  | $ | 30,986 |  |  | $ | 418,819 |  |  | $ | 162,998 |  |  | $ | 15,037 |  |  | $ | 178,035 |
Amortized cost |  |  | 454,930 |  |  |  | 41,056 |  |  |  | 495,986 |  |  |  | 166,602 |  |  |  | 15,714 |  |  |  | 182,316 |
Unrealized loss |  | $ | (67,097 | ) |  | $ | (10,070 | ) |  | $ | (77,167 | ) |  | $ | (3,604 | ) |  | $ | (677 | ) |  | $ | (4,281 | )
Total fixed income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value |  | $ | 1,748,895 |  |  | $ | 202,606 |  |  | $ | 1,951,501 |  |  | $ | 642,717 |  |  | $ | 135,459 |  |  | $ | 778,176 |
Amortized cost |  |  | 1,914,320 |  |  |  | 239,831 |  |  |  | 2,154,151 |  |  |  | 654,184 |  |  |  | 140,883 |  |  |  | 795,067 |
Unrealized loss |  | $ | (165,425 | ) |  | $ | (37,225 | ) |  | $ | (202,650 | ) |  | $ | (11,467 | ) |  | $ | (5,424 | ) |  | $ | (16,891 | )
* | Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities
Schedule of Credit Quality Indicators for Investments in Unrealized Loss Positions |
|  | Equivalent |  | Equivalent |  | (dollars in thousands) |  |  |  |  |  |
NAIC |  | S&P |  | Moody’s |  | Amortized |  |  |  |  |  |  | Unrealized |  |  | Percent |  |
Rating |  | Rating |  | Rating |  | Cost |  |  | Fair Value |  |  | Loss |  |  | to Total |  |
1 |  | AAA/AA/A |  | Aaa/Aa/A |  | $ | 1,658,961 |  |  | $ | 1,499,693 |  |  | $ | (159,268 | ) |  |  | 78.6 |  | %
2 |  | BBB |  | Baa |  |  | 350,114 |  |  |  | 319,538 |  |  |  | (30,576 | ) |  |  | 15.1 |  | %
3 |  | BB |  | Ba |  |  | 86,132 |  |  |  | 78,065 |  |  |  | (8,067 | ) |  |  | 4.0 |  | %
4 |  | B |  | B |  |  | 56,650 |  |  |  | 52,186 |  |  |  | (4,464 | ) |  |  | 2.2 |  | %
5 |  | CCC |  | Caa |  |  | 2,294 |  |  |  | 2,019 |  |  |  | (275 | ) |  |  | 0.1 |  | %
6 |  | CC or lower |  | Ca or lower |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 0.0 |  | %
|  |  |  | Total |  | $ | 2,154,151 |  |  | $ | 1,951,501 |  |  | $ | (202,650 | ) |  |  | 100.0 |  | %

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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