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Investments (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-For-Sale Fixed Maturities | Available-for-sale fixed maturities at September 30, 2021 and December 31, 2020 included the following:
| September 30, 2021
(In thousands) | Amortized Cost |  |  |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Fixed maturities, available-for-sale |  |  |  |  |  |  |  |  |
U.S. Treasury obligations | $ | 241,696 |  |  |  |  | $ | 1,681 |  |  | $ | 672 |  |  | $ | 242,705 |
U.S. Government-sponsored enterprise obligations | 20,509 |  |  |  |  | 57 |  |  | 98 |  |  | 20,468 |
State and municipal bonds | 513,111 |  |  |  |  | 11,155 |  |  | 1,559 |  |  | 522,707 |
Corporate debt | 1,928,543 |  |  |  |  | 41,493 |  |  | 6,923 |  |  | 1,963,113 |
Residential mortgage-backed securities | 475,368 |  |  |  |  | 5,513 |  |  | 2,972 |  |  | 477,909 |
Agency commercial mortgage-backed securities | 14,531 |  |  |  |  | 460 |  |  | 49 |  |  | 14,942 |
Other commercial mortgage-backed securities | 216,595 |  |  |  |  | 3,545 |  |  | 1,116 |  |  | 219,024 |
Other asset-backed securities | 440,536 |  |  |  |  | 3,661 |  |  | 929 |  |  | 443,268 |
| $ | 3,850,889 |  |  |  |  | $ | 67,565 |  |  | $ | 14,318 |  |  | $ | 3,904,136 |
| December 31, 2020
(In thousands) | Amortized Cost |  | Allowance for Expected Credit Losses |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Fixed maturities, available-for-sale |  |  |  |  |  |  |  |  |
U.S. Treasury obligations | $ | 104,097 |  |  | $ | — |  |  | $ | 2,985 |  |  | $ | 23 |  |  | $ | 107,059 |
U.S. Government-sponsored enterprise obligations | 12,103 |  |  | — |  |  | 158 |  |  | — |  |  | 12,261 |
State and municipal bonds | 316,022 |  |  | — |  |  | 16,937 |  |  | 39 |  |  | 332,920 |
Corporate debt | 1,267,992 |  |  | 552 |  |  | 63,204 |  |  | 1,302 |  |  | 1,329,342 |
Residential mortgage-backed securities | 269,752 |  |  | — |  |  | 7,171 |  |  | 382 |  |  | 276,541 |
Agency commercial mortgage-backed securities | 12,623 |  |  | — |  |  | 687 |  |  | — |  |  | 13,310 |
Other commercial mortgage-backed securities | 109,244 |  |  | — |  |  | 4,788 |  |  | 940 |  |  | 113,092 |
Other asset-backed securities | 269,742 |  |  | — |  |  | 4,006 |  |  | 742 |  |  | 273,006 |
| $ | 2,361,575 |  |  | $ | 552 |  |  | $ | 99,936 |  |  | $ | 3,428 |  |  | $ | 2,457,531 |
Schedule of Available-For-Sale Securities by Contractual Maturity | The recorded cost basis and estimated fair value of available-for-sale fixed maturities at September 30, 2021, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
(In thousands) | Amortized Cost |  | Due in one year or less |  | Due after one year through five years |  | Due after five years through ten years |  | Due after ten years |  | Total Fair Value
Fixed maturities, available-for-sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury obligations | $ | 241,696 |  |  | $ | 19,945 |  |  | $ | 133,884 |  |  | $ | 86,726 |  |  | $ | 2,150 |  |  | $ | 242,705 |
U.S. Government-sponsored enterprise obligations | 20,509 |  |  | 3,826 |  |  | 11,363 |  |  | 5,134 |  |  | 145 |  |  | 20,468 |
State and municipal bonds | 513,111 |  |  | 15,273 |  |  | 174,664 |  |  | 188,717 |  |  | 144,053 |  |  | 522,707 |
Corporate debt | 1,928,543 |  |  | 119,700 |  |  | 927,016 |  |  | 809,889 |  |  | 106,508 |  |  | 1,963,113 |
Residential mortgage-backed securities | 475,368 |  |  |  |  |  |  |  |  |  |  | 477,909 |
Agency commercial mortgage-backed securities | 14,531 |  |  |  |  |  |  |  |  |  |  | 14,942 |
Other commercial mortgage-backed securities | 216,595 |  |  |  |  |  |  |  |  |  |  | 219,024 |
Other asset-backed securities | 440,536 |  |  |  |  |  |  |  |  |  |  | 443,268 |
| $ | 3,850,889 |  |  |  |  |  |  |  |  |  |  | $ | 3,904,136 |
Schedule of Investments Held in an Unrealized Loss Position | The following tables provide summarized information with respect to investments held in an unrealized loss position at September 30, 2021 and December 31, 2020, including the length of time the investment had been held in a continuous unrealized loss position.
| September 30, 2021
| Total |  | Less than 12 months |  | 12 months or longer
| Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(In thousands) | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss
Fixed maturities, available-for-sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury obligations | $ | 162,063 |  |  | $ | 672 |  |  | $ | 157,445 |  |  | $ | 582 |  |  | $ | 4,618 |  |  | $ | 90 |
U.S. Government-sponsored enterprise obligations | 14,422 |  |  | 98 |  |  | 14,422 |  |  | 98 |  |  | — |  |  | — |
State and municipal bonds | 194,740 |  |  | 1,559 |  |  | 192,610 |  |  | 1,467 |  |  | 2,130 |  |  | 92 |
Corporate debt | 637,694 |  |  | 6,923 |  |  | 607,003 |  |  | 6,134 |  |  | 30,691 |  |  | 789 |
Residential mortgage-backed securities | 284,636 |  |  | 2,972 |  |  | 276,253 |  |  | 2,732 |  |  | 8,383 |  |  | 240 |
Agency commercial mortgage-backed securities | 4,040 |  |  | 49 |  |  | 4,040 |  |  | 49 |  |  | — |  |  | — |
Other commercial mortgage-backed securities | 77,254 |  |  | 1,116 |  |  | 72,541 |  |  | 783 |  |  | 4,713 |  |  | 333 |
Other asset-backed securities | 166,667 |  |  | 929 |  |  | 162,161 |  |  | 867 |  |  | 4,506 |  |  | 62 |
| $ | 1,541,516 |  |  | $ | 14,318 |  |  | $ | 1,486,475 |  |  | $ | 12,712 |  |  | $ | 55,041 |  |  | $ | 1,606 |
| December 31, 2020
| Total |  | Less than 12 months |  | 12 months or longer
| Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(In thousands) | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss
Fixed maturities, available-for-sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury obligations | $ | 14,390 |  |  | $ | 23 |  |  | $ | 14,390 |  |  | $ | 23 |  |  | $ | — |  |  | $ | — |
State and municipal bonds | 6,416 |  |  | 39 |  |  | 6,416 |  |  | 39 |  |  | — |  |  | — |
Corporate debt | 94,695 |  |  | 1,302 |  |  | 79,436 |  |  | 1,020 |  |  | 15,259 |  |  | 282 |
Residential mortgage-backed securities | 34,928 |  |  | 382 |  |  | 34,509 |  |  | 381 |  |  | 419 |  |  | 1 |
Other commercial mortgage-backed securities | 18,766 |  |  | 940 |  |  | 18,480 |  |  | 935 |  |  | 286 |  |  | 5 |
Other asset-backed securities | 43,739 |  |  | 742 |  |  | 37,850 |  |  | 701 |  |  | 5,889 |  |  | 41 |
| $ | 212,934 |  |  | $ | 3,428 |  |  | $ | 191,081 |  |  | $ | 3,099 |  |  | $ | 21,853 |  |  | $ | 329 |
Schedule of a Roll Forward of Cumulative Credit Losses Recorded in Earnings Related to Impaired Debt Securities | The following tables present a roll forward of the allowance for expected credit losses on available-for-sale fixed maturities for the nine months ended September 30, 2021 and three and nine months ended September 30, 2020. There was no change in the allowance for expected credit losses for the three months ended September 30, 2021.
|  |  | Nine Months Ended September 30, 2021
(In thousands) |  |  | Corporate Debt |  |  |  |  | Total
Balance, at December 31, 2020 |  |  | $ | 552 |  |  |  |  |  | $ | 552 |
Reductions related to: |  |  |  |  |  |  |  |
Securities sold during the period |  |  | (552) |  |  |  |  |  | (552) |
Balance, at September 30, 2021 |  |  | $ | — |  |  |  |  |  | $ | — |
|  |  | Three Months Ended September 30, 2020
(In thousands) |  |  | Corporate Debt |  |  |  |  | Total
Balance, at July 1, 2020 |  |  | $ | 1,408 |  |  |  |  |  | $ | 1,408 |
Reductions related to: |  |  |  |  |  |  |  |
Securities sold during the period |  |  | (856) |  |  |  |  |  | (856) |
Balance, at September 30, 2020 |  |  | $ | 552 |  |  |  |  |  | $ | 552 |
|  |  | Nine Months Ended September 30, 2020
(In thousands) |  |  | Corporate Debt |  |  |  |  | Total
Balance, at December 31, 2019 |  |  | $ | — |  |  |  |  |  | $ | — |
Additional credit losses related to securities for which: |  |  |  |  |  |  |  |
No allowance for credit losses has been previously recognized |  |  | 1,508 |  |  |  |  |  | 1,508 |
Reductions related to: |  |  |  |  |  |  |  |
Securities sold during the period |  |  | (956) |  |  |  |  |  | (956) |
Balance, at September 30, 2020 |  |  | $ | 552 |  |  |  |  |  | $ | 552 |
Schedule of Other Information Regarding Available-For-Sale Securities | Other information regarding sales and purchases of fixed maturity available-for-sale securities is as follows:
| Three Months Ended September 30 |  | Nine Months Ended September 30
(In millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Proceeds from sales (exclusive of maturities and paydowns) | $ | 85.4 |  |  | $ | 86.9 |  |  | $ | 343.5 |  |  | $ | 304.6 |
Purchases | $ | 404.1 |  |  | $ | 317.5 |  |  | $ | 1,169.6 |  |  | $ | 689.4 |
Schedule of Net Investment Income | Net investment income by investment category was as follows:
| Three Months Ended September 30 |  | Nine Months Ended September 30
(In thousands) | 2021 |  | 2020 |  | 2021 |  | 2020
Fixed maturities | $ | 20,121 |  |  | $ | 16,902 |  |  | $ | 53,969 |  |  | $ | 52,863 |
Equities | 648 |  |  | 706 |  |  | 1,790 |  |  | 3,598 |
Short-term investments, including Other | 587 |  |  | 405 |  |  | 1,539 |  |  | 2,386 |
BOLI | 622 |  |  | 655 |  |  | 1,752 |  |  | 1,568 |
Investment fees and expenses | (2,700) |  |  | (1,744) |  |  | (7,337) |  |  | (4,538) |
Net investment income | $ | 19,278 |  |  | $ | 16,924 |  |  | $ | 51,713 |  |  | $ | 55,877 |
Schedule of Investment in Unconsolidated Subsidiaries | ProAssurance's investment in unconsolidated subsidiaries were as follows:
| September 30, 2021 |  | Carrying Value
(In thousands) | Percentage Ownership |  | September 30, 2021 |  | December 31, 2020
Qualified affordable housing project tax credit partnerships | See below |  | $ | 15,980 |  |  | $ | 27,719 |
All other investments, primarily investment fund LPs/LLCs | See below |  | 301,889 |  |  | 282,810 |
|  |  | $ | 317,869 |  |  | $ | 310,529 |
Schedule of Equity Method Investments | The results recorded and tax credits recognized related to ProAssurance's tax credit partnership investments were as follows:
| Three Months Ended September 30 |  | Nine Months Ended September 30
(In thousands) | 2021 |  | 2020 |  | 2021 |  | 2020
Qualified affordable housing project tax credit partnerships |  |  |  |  |  |  |
Losses recorded | $ | 3,591 |  |  | $ | 4,798 |  |  | $ | 11,712 |  |  | $ | 14,152 |
Tax credits recognized | $ | 3,226 |  |  | $ | 4,369 |  |  | $ | 9,880 |  |  | $ | 13,106 |
Historic tax credit partnership* |  |  |  |  |  |  |
Losses (gains) recorded | $ | — |  |  | $ | (264) |  |  | $ | (182) |  |  | $ | 1,820 |
Tax credits recognized (reversed) | $ | (100) |  |  | $ | 103 |  |  | $ | — |  |  | $ | 309 |
* ProAssurance holds a historic tax credit partnership which was fully amortized in 2020. ProAssurance received a distribution associated with this investment during the first quarter of 2021 as a result of positive cash flows from a project recognizing an operating gain. See further discussion on this investment in Note 3 of the Notes to the Consolidated Financial Statements in ProAssurance’s December 31, 2020 report on Form 10-K.
Schedule of Net Realized Investment Gains (Losses) | Realized investment gains and losses are recognized on the first-in, first-out basis. The following table provides detailed information regarding net realized investment gains (losses):
| Three Months Ended September 30 |  | Nine Months Ended September 30 |  |
(In thousands) | 2021 |  | 2020 |  | 2021 |  | 2020 |  |  |  |
Total impairment losses: |  |  |  |  |  |  |  |  |  |  |
Corporate debt | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (1,745) |  |  |  |  |
Portion of impairment losses recognized in other comprehensive income before taxes: |  |  |  |  |  |  |  |  |  |  |
Corporate debt | — |  |  | — |  |  | — |  |  | 237 |  |  |  |  |
Net impairment losses recognized in earnings | — |  |  | — |  |  | — |  |  | (1,508) |  |  |  |  |
Gross realized gains, available-for-sale fixed maturities | 2,225 |  |  | 3,996 |  |  | 12,540 |  |  | 10,941 |  |  |  |  |
Gross realized (losses), available-for-sale fixed maturities | (259) |  |  | (396) |  |  | (798) |  |  | (2,266) |  |  |  |  |
Net realized gains (losses), trading fixed maturities | (47) |  |  | 116 |  |  | 17 |  |  | 268 |  |  |  |  |
Net realized gains (losses), equity investments | 426 |  |  | 31 |  |  | 6,616 |  |  | 10,589 |  |  |  |  |
Net realized gains (losses), other investments | 1,699 |  |  | 530 |  |  | 6,192 |  |  | 2,442 |  |  |  |  |
Change in unrealized holding gains (losses), trading fixed maturities | (49) |  |  | 373 |  |  | (489) |  |  | 637 |  |  |  |  |
Change in unrealized holding gains (losses), equity investments | (945) |  |  | 2,766 |  |  | (2,182) |  |  | (21,012) |  |  |  |  |
Change in unrealized holding gains (losses), convertible securities, carried at fair value | (2,457) |  |  | 1,170 |  |  | (2,118) |  |  | (190) |  |  |  |  |
Other | (63) |  |  | 252 |  |  | 434 |  |  | 249 |  |  |  |  |
Net realized investment gains (losses) | $ | 530 |  |  | $ | 8,838 |  |  | $ | 20,212 |  |  | $ | 150 |  |  |  |  |
Schedule of Cumulative Credit Losses Recorded in Earnings Related to Impaired Debt Securities for Which a Portion of the OTTI has been Recorded in OCI | The following table presents a roll forward of cumulative credit losses recorded in earnings related to impaired debt securities for which a portion of the impairment was recorded in OCI.
| Three Months Ended September 30 |  | Nine Months Ended September 30
(In thousands) | 2021 |  | 2020 |  | 2021 |  | 2020
Balance, beginning of period | $ | — |  |  | $ | 1,322 |  |  | $ | 552 |  |  | $ | 470 |
Additional credit losses recognized during the period, related to securities for which: |  |  |  |  |  |  |
No impairment has been previously recognized | — |  |  | — |  |  | — |  |  | 1,064 |
Impairment has been previously recognized | — |  |  | — |  |  | — |  |  | 258 |
Reductions due to: |  |  |  |  |  |  |
Securities sold during the period (realized) | — |  |  | (770) |  |  | (552) |  |  | (1,240) |
Balance, September 30 | $ | — |  |  | $ | 552 |  |  | $ | — |  |  | $ | 552 |

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