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Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
Gross Unrecognized Gains and Losses and Cost or Amortized Cost, Allowance for Credit Losses, Carrying Amount and Fair Value of Investments Classified as Held-to-Maturity (Detail) | The amortized cost, allowance for credit losses, carrying amount, gross unrecognized gains and losses, and the fair value of those investments classified as held-to-maturity at December 31, 2023 are summarized as follows:
|  | Amortized Cost |  |  | Allowance for Credit Losses |  |  | Carrying Amount |  |  | Gross Unrecognized Gains |  |  | Gross Unrecognized Losses |  |  | Fair Value |
|  | (in thousands) |
States and political subdivisions |  | $ | 416,916 |  |  | $ | (38 | ) |  | $ | 416,878 |  |  | $ | 4,166 |  |  | $ | (12,074 | ) |  | $ | 408,970 |
Corporate bonds |  |  | 52,321 |  |  |  | (142 | ) |  |  | 52,179 |  |  |  | — |  |  |  | (2,231 | ) |  |  | 49,948 |
U.S. agency-based mortgage-backed securities |  |  | 3,297 |  |  |  | — |  |  |  | 3,297 |  |  |  | 25 |  |  |  | (123 | ) |  |  | 3,199 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 11,186 |  |  |  | — |  |  |  | 11,186 |  |  |  | 26 |  |  |  | (273 | ) |  |  | 10,939 |
Asset-backed securities |  |  | 37 |  |  |  | (2 | ) |  |  | 35 |  |  |  | 1 |  |  |  | — |  |  |  | 36 |
Totals |  | $ | 483,757 |  |  | $ | (182 | ) |  | $ | 483,575 |  |  | $ | 4,218 |  |  | $ | (14,701 | ) |  | $ | 473,092 |
The amortized cost, allowance for credit losses, carrying amount, gross unrealized gains and losses, and the fair value of those investments classified as held-to-maturity at December 31, 2022 are summarized as follows:
|  | Amortized Cost |  |  | Allowance for Credit Losses |  |  | Carrying Amount |  |  | Gross Unrecognized Gains |  |  | Gross Unrecognized Losses |  |  | Fair Value |
|  | (in thousands) |
States and political subdivisions |  | $ | 415,136 |  |  | $ | (40 | ) |  | $ | 415,096 |  |  | $ | 922 |  |  | $ | (20,074 | ) |  | $ | 395,944 |
Corporate bonds |  |  | 59,903 |  |  |  | (196 | ) |  |  | 59,707 |  |  |  | 1 |  |  |  | (3,857 | ) |  |  | 55,851 |
U.S. agency-based mortgage-backed securities |  |  | 3,696 |  |  |  | — |  |  |  | 3,696 |  |  |  | 33 |  |  |  | (153 | ) |  |  | 3,576 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 13,123 |  |  |  | — |  |  |  | 13,123 |  |  |  | 25 |  |  |  | (442 | ) |  |  | 12,706 |
Asset-backed securities |  |  | 69 |  |  |  | (3 | ) |  |  | 66 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 67 |
Totals |  | $ | 491,927 |  |  | $ | (239 | ) |  | $ | 491,688 |  |  | $ | 983 |  |  | $ | (24,527 | ) |  | $ | 468,144 |
Gross Unrealized Gains and Losses and Cost or Amortized Cost, Allowance for Credit Losses and Fair Value of Investments Classified as Available-for-sale | The amortized cost, gross unrealized gains and losses, fair value, and the allowance for credit losses of those investments classified as available-for-sale at December 31, 2023 are summarized as follows:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Allowance for Credit Losses |
|  | (in thousands) |
States and political subdivisions |  | $ | 138,031 |  |  | $ | 583 |  |  | $ | (6,719 | ) |  | $ | 131,895 |  |  | $ | — |
Corporate bonds |  |  | 168,134 |  |  |  | 2,105 |  |  |  | (3,486 | ) |  |  | 166,753 |  |  |  | — |
U.S. agency-based mortgage-backed securities |  |  | 5,190 |  |  |  | — |  |  |  | (445 | ) |  |  | 4,745 |  |  |  | — |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 14,816 |  |  |  | — |  |  |  | (1,145 | ) |  |  | 13,671 |  |  |  | — |
Totals |  | $ | 326,171 |  |  | $ | 2,688 |  |  | $ | (11,795 | ) |  | $ | 317,064 |  |  | $ | — |
The amortized cost, gross unrealized gains and losses, fair value, and the allowance for credit losses of those investments classified as available-for-sale at December 31, 2022 are summarized as follows:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Allowance for Credit Losses |
|  | (in thousands) |
States and political subdivisions |  | $ | 166,019 |  |  | $ | 463 |  |  | $ | (9,826 | ) |  | $ | 156,656 |  |  | $ | — |
Corporate bonds |  |  | 150,915 |  |  |  | 530 |  |  |  | (6,657 | ) |  |  | 144,788 |  |  |  | — |
U.S. agency-based mortgage-backed securities |  |  | 5,984 |  |  |  | — |  |  |  | (538 | ) |  |  | 5,446 |  |  |  | — |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 15,675 |  |  |  | 9 |  |  |  | (1,453 | ) |  |  | 14,231 |  |  |  | — |
Totals |  | $ | 338,593 |  |  | $ | 1,002 |  |  | $ | (18,474 | ) |  | $ | 321,121 |  |  | $ | — |
Gross Unrealized Gains and Losses and Cost of Equity | The cost, gross unrealized gains and losses, and the fair value of equity securities at December 31, 2023 are summarized as follows:
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |
Domestic common stock |  | $ | 44,046 |  |  | $ | 13,101 |  |  | $ | — |  |  | $ | 57,147 |
Total equity securities |  | $ | 44,046 |  |  | $ | 13,101 |  |  | $ | — |  |  | $ | 57,147 |
The cost, gross unrealized gains and losses on, and fair value of equity securities at December 31, 2022 are summarized as follows:
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |
Domestic common stock |  | $ | 50,185 |  |  | $ | 11,873 |  |  | $ | — |  |  | $ | 62,058 |
Total equity securities |  | $ | 50,185 |  |  | $ | 11,873 |  |  | $ | — |  |  | $ | 62,058 |
A Summary of the Company's Realized Gains and Losses on Sales, Calls or Redemptions of Investments | A summary of the Company’s realized gains and losses on sales, calls or redemptions of investments for 2023, 2022 and 2021 is as follows:
|  | Fixed Maturity Securities Available-for-Sale |  |  | Equity Securities |  |  | Other |  |  | Total |
|  | (in thousands) |
Year ended December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  | $ | 28,292 |  |  | $ | 12,688 |  |  | $ | 925 |  |  | $ | 41,905 |
Gross realized investment gains |  | $ | 181 |  |  | $ | 6,548 |  |  | $ | — |  |  | $ | 6,729 |
Gross realized investment losses |  |  | (173 | ) |  |  | — |  |  |  | — |  |  |  | (173 | )
Net realized investment gains |  |  | 8 |  |  |  | 6,548 |  |  |  | — |  |  |  | 6,556 |
Other, including gains on calls and redemptions |  |  | — |  |  |  | — |  |  |  | 23 |  |  |  | 23 |
Net realized gains on investments |  | $ | 8 |  |  | $ | 6,548 |  |  | $ | 23 |  |  | $ | 6,579 |
Year ended December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  | $ | 42,505 |  |  | $ | 8,487 |  |  | $ | — |  |  | $ | 50,992 |
Gross realized investment gains |  | $ | 365 |  |  | $ | 3,350 |  |  | $ | — |  |  | $ | 3,715 |
Gross realized investment losses |  |  | (51 | ) |  |  | — |  |  |  | — |  |  |  | (51 | )
Net realized investment gains |  |  | 314 |  |  |  | 3,350 |  |  |  | — |  |  |  | 3,664 |
Other, including losses on calls and redemptions |  |  | (200 | ) |  |  | — |  |  |  | (24 | ) |  |  | (224 | )
Net realized gains (losses) on investments |  | $ | 114 |  |  | $ | 3,350 |  |  | $ | (24 | ) |  | $ | 3,440 |
Year ended December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  | $ | 28,191 |  |  | $ | — |  |  | $ | 12,388 |  |  | $ | 40,579 |
Gross realized investment gains |  | $ | 1,751 |  |  | $ | — |  |  | $ | 3 |  |  | $ | 1,754 |
Gross realized investment losses |  |  | (21 | ) |  |  | — |  |  |  | — |  |  |  | (21 | )
Net realized investment gains |  |  | 1,730 |  |  |  | — |  |  |  | 3 |  |  |  | 1,733 |
Other, including losses on calls and redemptions |  |  | (6 | ) |  |  | — |  |  |  | (32 | ) |  |  | (38 | )
Net realized gains (losses) on investments |  | $ | 1,724 |  |  | $ | — |  |  | $ | (29 | ) |  | $ | 1,695 |
Major Categories of the Company's Net Investment Income | Major categories of the Company’s net investment income are summarized as follows:
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
|  | (in thousands) |
Gross investment income: |  |  |  |  |  |  |  |  |
Fixed maturity securities |  | $ | 26,357 |  |  | $ | 24,399 |  |  | $ | 24,882 |
Equity securities |  |  | 1,456 |  |  |  | 1,566 |  |  |  | 1,236 |
Short-term investments and cash and cash equivalents |  |  | 4,456 |  |  |  | 2,260 |  |  |  | 304 |
Total gross investment income |  |  | 32,269 |  |  |  | 28,225 |  |  |  | 26,422 |
Investment expenses |  |  | (930 | ) |  |  | (1,002 | ) |  |  | (987 | )
Net investment income |  | $ | 31,339 |  |  | $ | 27,223 |  |  | $ | 25,435 |
Investment Securities Continuous Unrealized Loss Position | The following table summarizes the fair value and gross unrealized losses on fixed maturity securities classified as available-for-sale, aggregated by major investment category and length of time that the individual securities have been in a continuous unrealized loss position:
|  | Less Than 12 Months |  |  | 12 Months or Greater |  |  | Total |
|  | Fair Value of Investments with Unrealized Losses |  |  | Gross Unrealized Losses |  |  | Fair Value of Investments with Unrealized Losses |  |  | Gross Unrealized Losses |  |  | Fair Value of Investments with Unrealized Losses |  |  | Gross Unrealized Losses |
|  | (in thousands) |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 14,115 |  |  | $ | 111 |  |  | $ | 72,358 |  |  | $ | 6,608 |  |  | $ | 86,473 |  |  | $ | 6,719 |
Corporate bonds |  |  | 26,178 |  |  |  | 96 |  |  |  | 93,538 |  |  |  | 3,390 |  |  |  | 119,716 |  |  |  | 3,486 |
U.S. agency-based mortgage-backed securities |  |  | — |  |  |  | — |  |  |  | 4,745 |  |  |  | 445 |  |  |  | 4,745 |  |  |  | 445 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | — |  |  |  | — |  |  |  | 13,672 |  |  |  | 1,145 |  |  |  | 13,672 |  |  |  | 1,145 |
Total available-for-sale securities |  | $ | 40,293 |  |  | $ | 207 |  |  | $ | 184,313 |  |  | $ | 11,588 |  |  | $ | 224,606 |  |  | $ | 11,795 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 87,522 |  |  | $ | 5,319 |  |  | $ | 24,980 |  |  | $ | 4,507 |  |  | $ | 112,502 |  |  | $ | 9,826 |
Corporate bonds |  |  | 98,590 |  |  |  | 4,549 |  |  |  | 30,011 |  |  |  | 2,108 |  |  |  | 128,601 |  |  |  | 6,657 |
U.S. agency-based mortgage-backed securities |  |  | 4,732 |  |  |  | 444 |  |  |  | 714 |  |  |  | 94 |  |  |  | 5,446 |  |  |  | 538 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 5,589 |  |  |  | 313 |  |  |  | 7,719 |  |  |  | 1,140 |  |  |  | 13,308 |  |  |  | 1,453 |
Total available-for-sale securities |  | $ | 196,433 |  |  | $ | 10,625 |  |  | $ | 63,424 |  |  | $ | 7,849 |  |  | $ | 259,857 |  |  | $ | 18,474 |
Changes in Allowance for Credit Losses by Major Security Type of Investments Classified as Held-to-Maturity | The following table illustrates the changes in the allowance for credit losses by major security type of the investments classified as held-to-maturity for the year ended December 31, 2023.
|  | States and Political Subdivisions |  |  | Corporate Bonds |  |  | U.S. Agency -Based Mortgage- Backed Securities |  |  | U.S. Treasury Securities and Obligations of U.S. Government Agencies |  |  | Asset-Backed Securities |  |  | Totals |
|  | (in thousands) |
Balance at December 31, 2022 |  | $ | 40 |  |  | $ | 196 |  |  | $ | — |  |  | $ | — |  |  | $ | 3 |  |  | $ | 239 |
Provision for credit loss benefit |  |  | (2 | ) |  |  | (54 | ) |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | (57 | )
Balance at December 31, 2023 |  | $ | 38 |  |  | $ | 142 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | 182 |
Schedule of Amortized Cost Held-to-Maturity Securities Aggregated By Credit Quality Indicator | The table below presents the amortized cost of held-to-maturity securities aggregated by credit quality indicator as of December 31, 2023.
|  | States and Political Subdivisions |  |  | Corporate Bonds |  |  | U.S. Agency -Based Mortgage- Backed Securities |  |  | U.S. Treasury Securities and Obligations of U.S. Government Agencies |  |  | Asset-Backed Securities |  |  | Totals |
|  | Amortized cost |
|  | (in thousands) |
AAA/AA/A ratings |  | $ | 413,966 |  |  | $ | 22,696 |  |  | $ | 3,297 |  |  | $ | 11,186 |  |  | $ | 23 |  |  | $ | 451,168 |
Baa/BBB ratings |  |  | 2,950 |  |  |  | 29,625 |  |  |  | — |  |  |  | — |  |  |  | 14 |  |  |  | 32,589 |
B ratings |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 416,916 |  |  | $ | 52,321 |  |  | $ | 3,297 |  |  | $ | 11,186 |  |  | $ | 37 |  |  | $ | 483,757 |
Held-to-Maturity Securities [Member] |
Summary of Carrying Amount, Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, by Contractual Maturity | A summary of the carrying amounts and fair value of investments in fixed maturity securities classified as held-to-maturity, by contractual maturity, is as follows:
|  | December 31, 2023 |  |  | December 31, 2022 |
|  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
|  | (in thousands) |
Maturity: |  |  |  |  |  |  |  |  |  |  |  |
Within one year |  | $ | 64,129 |  |  | $ | 63,703 |  |  | $ | 41,878 |  |  | $ | 41,652 |
After one year through five years |  |  | 136,854 |  |  |  | 131,396 |  |  |  | 165,216 |  |  |  | 159,006 |
After five years through ten years |  |  | 114,990 |  |  |  | 110,814 |  |  |  | 121,739 |  |  |  | 112,665 |
After ten years |  |  | 164,270 |  |  |  | 163,944 |  |  |  | 159,093 |  |  |  | 151,178 |
U.S. agency-based mortgage-backed securities |  |  | 3,297 |  |  |  | 3,199 |  |  |  | 3,696 |  |  |  | 3,576 |
Asset-backed securities |  |  | 35 |  |  |  | 36 |  |  |  | 66 |  |  |  | 67 |
Totals |  | $ | 483,575 |  |  | $ | 473,092 |  |  | $ | 491,688 |  |  | $ | 468,144 |
Available-for-Sale Securities [Member] |
Summary of Carrying Amount, Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, by Contractual Maturity | A summary of the amortized cost and fair value of investments in fixed maturity securities classified as available-for-sale, by contractual maturity, is as follows:
|  | December 31, 2023 |  |  | December 31, 2022 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
|  | (in thousands) |
Maturity: |  |  |  |  |  |  |  |  |  |  |  |
Within one year |  | $ | 25,995 |  |  | $ | 25,875 |  |  | $ | 28,290 |  |  | $ | 27,814 |
After one year through five years |  |  | 106,178 |  |  |  | 102,201 |  |  |  | 68,876 |  |  |  | 65,406 |
After five years through ten years |  |  | 82,664 |  |  |  | 80,911 |  |  |  | 102,296 |  |  |  | 95,366 |
After ten years |  |  | 106,144 |  |  |  | 103,332 |  |  |  | 133,147 |  |  |  | 127,089 |
U.S. agency-based mortgage-backed securities |  |  | 5,190 |  |  |  | 4,745 |  |  |  | 5,984 |  |  |  | 5,446 |
Totals |  | $ | 326,171 |  |  | $ | 317,064 |  |  | $ | 338,593 |  |  | $ | 321,121 |

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