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Investments (Tables) | 3 Months Ended
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Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-For-Sale Fixed Maturities | Available-for-sale fixed maturities at March 31, 2024 and December 31, 2023 included the following:
| March 31, 2024
(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 | $ | 258,462 |  |  | $ | — |  |  | $ | 24 |  |  | $ | 17,597 |  |  | $ | 240,889 |
U.S. Government-sponsored enterprise obligations | 19,957 |  |  | — |  |  | — |  |  | 1,030 |  |  | 18,927 |
State and municipal bonds | 502,549 |  |  | — |  |  | 1,736 |  |  | 30,020 |  |  | 474,265 |
Corporate debt | 1,849,162 |  |  | 740 |  |  | 2,421 |  |  | 136,791 |  |  | 1,714,052 |
Residential mortgage-backed securities | 507,312 |  |  | 207 |  |  | 2,020 |  |  | 59,073 |  |  | 450,052 |
Agency commercial mortgage-backed securities | 8,964 |  |  | — |  |  | — |  |  | 1,014 |  |  | 7,950 |
Other commercial mortgage-backed securities | 248,756 |  |  | — |  |  | 221 |  |  | 19,948 |  |  | 229,029 |
Other asset-backed securities | 418,695 |  |  | 190 |  |  | 921 |  |  | 10,453 |  |  | 408,973 |
| $ | 3,813,857 |  |  | $ | 1,137 |  |  | $ | 7,343 |  |  | $ | 275,926 |  |  | $ | 3,544,137 |
| December 31, 2023
(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 | $ | 259,834 |  |  | $ | — |  |  | $ | 165 |  |  | $ | 16,474 |  |  | $ | 243,525 |
U.S. Government-sponsored enterprise obligations | 19,752 |  |  | — |  |  | 2 |  |  | 1,030 |  |  | 18,724 |
State and municipal bonds | 482,367 |  |  | — |  |  | 1,885 |  |  | 29,871 |  |  | 454,381 |
Corporate debt | 1,883,308 |  |  | — |  |  | 4,025 |  |  | 136,759 |  |  | 1,750,574 |
Residential mortgage-backed securities | 481,267 |  |  | 211 |  |  | 2,876 |  |  | 53,795 |  |  | 430,137 |
Agency commercial mortgage-backed securities | 9,369 |  |  | — |  |  | 5 |  |  | 987 |  |  | 8,387 |
Other commercial mortgage-backed securities | 210,469 |  |  | 151 |  |  | 60 |  |  | 20,904 |  |  | 189,474 |
Other asset-backed securities | 412,354 |  |  | 193 |  |  | 1,104 |  |  | 14,870 |  |  | 398,395 |
| $ | 3,758,720 |  |  | $ | 555 |  |  | $ | 10,122 |  |  | $ | 274,690 |  |  | $ | 3,493,597 |
Schedule of Available-For-Sale Securities by Contractual Maturity | The recorded cost basis and estimated fair value of available-for-sale fixed maturities at March 31, 2024, 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 | $ | 258,462 |  |  | $ | 36,249 |  |  | $ | 169,651 |  |  | $ | 32,387 |  |  | $ | 2,602 |  |  | $ | 240,889 |
U.S. Government-sponsored enterprise obligations | 19,957 |  |  | 4,790 |  |  | 11,653 |  |  | 505 |  |  | 1,979 |  |  | 18,927 |
State and municipal bonds | 502,549 |  |  | 30,409 |  |  | 157,707 |  |  | 161,274 |  |  | 124,875 |  |  | 474,265 |
Corporate debt | 1,849,162 |  |  | 179,206 |  |  | 886,529 |  |  | 569,033 |  |  | 79,284 |  |  | 1,714,052 |
Residential mortgage-backed securities | 507,312 |  |  |  |  |  |  |  |  |  |  | 450,052 |
Agency commercial mortgage-backed securities | 8,964 |  |  |  |  |  |  |  |  |  |  | 7,950 |
Other commercial mortgage-backed securities | 248,756 |  |  |  |  |  |  |  |  |  |  | 229,029 |
Other asset-backed securities | 418,695 |  |  |  |  |  |  |  |  |  |  | 408,973 |
| $ | 3,813,857 |  |  |  |  |  |  |  |  |  |  | $ | 3,544,137 |
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 March 31, 2024 and December 31, 2023, including the length of time the investment had been held in a continuous unrealized loss position.
| March 31, 2024
| 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 | $ | 226,103 |  |  | $ | 17,597 |  |  | $ | 40,747 |  |  | $ | 1,412 |  |  | $ | 185,356 |  |  | $ | 16,185 |
U.S. Government-sponsored enterprise obligations | 18,928 |  |  | 1,030 |  |  | 10,631 |  |  | 486 |  |  | 8,297 |  |  | 544 |
State and municipal bonds | 389,539 |  |  | 30,020 |  |  | 98,395 |  |  | 5,941 |  |  | 291,144 |  |  | 24,079 |
Corporate debt | 1,498,062 |  |  | 136,791 |  |  | 459,157 |  |  | 38,451 |  |  | 1,038,905 |  |  | 98,340 |
Residential mortgage-backed securities | 335,297 |  |  | 59,073 |  |  | 130,058 |  |  | 16,800 |  |  | 205,239 |  |  | 42,273 |
Agency commercial mortgage-backed securities | 7,950 |  |  | 1,014 |  |  | 2,652 |  |  | 344 |  |  | 5,298 |  |  | 670 |
Other commercial mortgage-backed securities | 214,030 |  |  | 19,948 |  |  | 90,586 |  |  | 8,120 |  |  | 123,444 |  |  | 11,828 |
Other asset-backed securities | 252,384 |  |  | 10,453 |  |  | 125,871 |  |  | 3,746 |  |  | 126,513 |  |  | 6,707 |
| $ | 2,942,293 |  |  | $ | 275,926 |  |  | $ | 958,097 |  |  | $ | 75,300 |  |  | $ | 1,984,196 |  |  | $ | 200,626 |
| December 31, 2023
| 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 | $ | 213,634 |  |  | $ | 16,474 |  |  | $ | 32,925 |  |  | $ | 1,364 |  |  | $ | 180,709 |  |  | $ | 15,110 |
U.S. Government-sponsored enterprise obligations | 18,428 |  |  | 1,030 |  |  | 4,128 |  |  | 242 |  |  | 14,300 |  |  | 788 |
State and municipal bonds | 378,313 |  |  | 29,871 |  |  | 48,960 |  |  | 2,287 |  |  | 329,353 |  |  | 27,584 |
Corporate debt | 1,524,940 |  |  | 136,759 |  |  | 84,221 |  |  | 5,054 |  |  | 1,440,719 |  |  | 131,705 |
Residential mortgage-backed securities | 313,082 |  |  | 53,795 |  |  | 74,463 |  |  | 10,271 |  |  | 238,619 |  |  | 43,524 |
Agency commercial mortgage-backed securities | 7,955 |  |  | 987 |  |  | 212 |  |  | 1 |  |  | 7,743 |  |  | 986 |
Other commercial mortgage-backed securities | 184,416 |  |  | 20,904 |  |  | 18,092 |  |  | 1,140 |  |  | 166,324 |  |  | 19,764 |
Other asset-backed securities | 293,447 |  |  | 14,870 |  |  | 30,115 |  |  | 867 |  |  | 263,332 |  |  | 14,003 |
| $ | 2,934,215 |  |  | $ | 274,690 |  |  | $ | 293,116 |  |  | $ | 21,226 |  |  | $ | 2,641,099 |  |  | $ | 253,464 |
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 three months ended March 31, 2024 and 2023.
|  |  | Three Months Ended March 31, 2024
(In thousands) |  |  | Corporate Debt | Residential mortgage-backed securities |  | Other commercial mortgage-backed securities | Other asset-backed securities | Total
Balance, at December 31, 2023 |  |  | $ | — |  | $ | 211 |  |  | $ | 151 |  | $ | 193 |  | $ | 555 |
Additional credit losses related to securities for which: |  |  |  |  |  |  |  |
No allowance for credit losses has been previously recognized |  |  | 740 |  | — |  |  | — |  | — |  | 740 |
Reductions related to: |  |  |  |  |  |  |  |
Securities sold during the period |  |  | — |  | (4) |  |  | (151) |  | (3) |  | (158) |
Balance, at March 31, 2024 |  |  | $ | 740 |  | $ | 207 |  |  | $ | — |  | $ | 190 |  | $ | 1,137 |
|  |  |  | Three Months Ended March 31, 2023
(In thousands) |  |  |  | Residential mortgage-backed securities |  |  | Other asset-backed securities | Total
Balance, at December 31, 2022 |  |  |  | $ | 229 |  |  |  | $ | 198 |  | $ | 427 |
Reductions related to: |  |  |  |  |  |  |  |
Securities sold during the period |  |  |  | (2) |  |  |  | (1) |  | (3) |
Balance, at March 31, 2023 |  |  |  | $ | 227 |  |  |  | $ | 197 |  | $ | 424 |
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 March 31
(In thousands) |  |  |  |  | 2024 |  | 2023
Balance beginning of period |  |  |  |  | $ | 57 |  |  | $ | 57 |
Additional credit losses recognized during the period, related to securities for which: |  |  |  |  |  |  |
No impairment has been previously recognized |  |  |  |  | 740 |  |  | — |
Balance March 31 |  |  |  |  | $ | 797 |  |  | $ | 57 |
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 March 31
(In millions) |  |  |  |  | 2024 |  | 2023
Proceeds from sales (exclusive of maturities and paydowns) |  |  |  |  | $ | 17.1 |  |  | $ | 3.8 |
Purchases |  |  |  |  | $ | 230.5 |  |  | $ | 68.8 |
Schedule of Net Investment Income | Net investment income (loss) by investment category was as follows:
|  |  | Three Months Ended March 31
(In thousands) |  |  |  |  | 2024 |  | 2023
Fixed maturities |  |  |  |  | $ | 31,451 |  |  | $ | 27,327 |
Equities |  |  |  |  | 892 |  |  | 807 |
Short-term investments, including Other |  |  |  |  | 3,411 |  |  | 3,350 |
BOLI |  |  |  |  | 452 |  |  | 657 |
Investment fees and expenses |  |  |  |  | (2,309) |  |  | (1,831) |
Net investment income |  |  |  |  | $ | 33,897 |  |  | $ | 30,310 |
Schedule of Investment in Unconsolidated Subsidiaries | ProAssurance's investment in unconsolidated subsidiaries were as follows:
| March 31, 2024 |  | Carrying Value
(In thousands) | Percentage Ownership |  | March 31, 2024 |  | December 31, 2023
Qualified affordable housing project tax credit partnerships | See below |  | $ | 562 |  |  | $ | 666 |
All other investments, primarily investment fund LPs/LLCs | See below |  | 278,369 |  |  | 276,090 |
|  |  | $ | 278,931 |  |  | $ | 276,756 |
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 March 31
(In thousands) |  |  |  |  | 2024 |  | 2023
Qualified affordable housing project tax credit partnerships |  |  |  |  |  |  |
Losses recorded |  |  |  |  | $ | 103 |  |  | $ | 354 |
Tax credits recognized |  |  |  |  | $ | 8 |  |  | $ | 43 |
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 investment gains (losses):
|  |  | Three Months Ended March 31
(In thousands) |  |  |  |  | 2024 |  | 2023
Total impairment losses: |  |  |  |  |  |  |
Corporate debt |  |  |  |  | $ | (1,316) |  |  | $ | (2,936) |
Asset-backed securities |  |  |  |  | (194) |  |  | 3 |
Portion of impairment losses recognized in other comprehensive income before taxes: |  |  |  |  |  |  |
Corporate debt |  |  |  |  | 576 |  |  | — |
Net impairment losses recognized in earnings |  |  |  |  | (934) |  |  | (2,933) |
Gross realized gains, available-for-sale fixed maturities |  |  |  |  | 366 |  |  | 79 |
Gross realized (losses), available-for-sale fixed maturities |  |  |  |  | (1,099) |  |  | (457) |
Net realized gains (losses), trading fixed maturities |  |  |  |  | 15 |  |  | (108) |
Net realized gains (losses), equity investments |  |  |  |  | (256) |  |  | 84 |
Net realized gains (losses), other investments |  |  |  |  | 1,776 |  |  | 229 |
Change in unrealized holding gains (losses), trading fixed maturities |  |  |  |  | 214 |  |  | 97 |
Change in unrealized holding gains (losses), equity investments |  |  |  |  | 774 |  |  | 3,746 |
Change in unrealized holding gains (losses), convertible securities, carried at fair value |  |  |  |  | (1,119) |  |  | 1,132 |
Other(1) |  |  |  |  | (5) |  |  | 1,043 |
Net investment gains (losses) |  |  |  |  | $ | (268) |  |  | $ | 2,912 |
(1) Includes a gain of $1.0 million recognized during the 2023 three-month period related to the change in the fair value of contingent consideration issued in connection with the NORCAL acquisition. See further discussion on the contingent consideration in Note 2 and Note 6 and discussion on the Company's accounting policy in Note 1 in its December 31, 2023 report on Form 10-K.

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