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Investments (Tables) | 6 Months Ended
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Jun. 30, 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 | 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 June 30, 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 |  | $ | 408,779 |  |  | $ | (41 | ) |  | $ | 408,738 |  |  | $ | 1,165 |  |  | $ | (18,023 | ) |  | $ | 391,880 |
Corporate bonds |  |  | 53,130 |  |  |  | (161 | ) |  |  | 52,969 |  |  |  | — |  |  |  | (3,381 | ) |  |  | 49,588 |
U.S. agency-based mortgage-backed securities |  |  | 3,499 |  |  |  | — |  |  |  | 3,499 |  |  |  | 15 |  |  |  | (150 | ) |  |  | 3,364 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 11,143 |  |  |  | — |  |  |  | 11,143 |  |  |  | 18 |  |  |  | (431 | ) |  |  | 10,730 |
Asset-backed securities |  |  | 54 |  |  |  | (2 | ) |  |  | 52 |  |  |  | — |  |  |  | (1 | ) |  |  | 51 |
Totals |  | $ | 476,605 |  |  | $ | (204 | ) |  | $ | 476,401 |  |  | $ | 1,198 |  |  | $ | (21,986 | ) |  | $ | 455,613 |
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, 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 June 30, 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 |  | $ | 155,935 |  |  | $ | 321 |  |  | $ | (8,340 | ) |  | $ | 147,916 |  |  | $ | — |
Corporate bonds |  |  | 178,426 |  |  |  | 767 |  |  |  | (6,066 | ) |  |  | 173,127 |  |  |  | — |
U.S. agency-based mortgage-backed securities |  |  | 5,598 |  |  |  | — |  |  |  | (536 | ) |  |  | 5,062 |  |  |  | — |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 15,711 |  |  |  | — |  |  |  | (1,432 | ) |  |  | 14,279 |  |  |  | — |
Totals |  | $ | 355,670 |  |  | $ | 1,088 |  |  | $ | (16,374 | ) |  | $ | 340,384 |  |  | $ | — |
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 June 30, 2023 are summarized as follows:
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |
Domestic common stock |  | $ | 50,115 |  |  | $ | 15,290 |  |  | $ | — |  |  | $ | 65,405 |
Total equity securities |  | $ | 50,115 |  |  | $ | 15,290 |  |  | $ | — |  |  | $ | 65,405 |
The cost, gross unrealized gains and losses, and the 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 |
Investment Securities Continuous Unrealized Loss Position | The following table summarizes the fair value and gross unrealized losses on 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 as of June 30, 2023:
|  | 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) |
June 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 46,548 |  |  | $ | 441 |  |  | $ | 62,315 |  |  | $ | 7,899 |  |  | $ | 108,863 |  |  | $ | 8,340 |
Corporate bonds |  |  | 98,553 |  |  |  | 2,755 |  |  |  | 51,149 |  |  |  | 3,311 |  |  |  | 149,702 |  |  |  | 6,066 |
U.S. agency-based mortgage-backed securities |  |  | — |  |  |  | — |  |  |  | 5,062 |  |  |  | 536 |  |  |  | 5,062 |  |  |  | 536 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 921 |  |  |  | 2 |  |  |  | 13,358 |  |  |  | 1,430 |  |  |  | 14,279 |  |  |  | 1,432 |
Total available-for-sale securities |  | $ | 146,022 |  |  | $ | 3,198 |  |  | $ | 131,884 |  |  | $ | 13,176 |  |  | $ | 277,906 |  |  | $ | 16,374 |
The following table summarizes the fair value and gross unrealized losses on 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 as of December 31, 2022:
|  | 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, 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 quarter ended June 30, 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 March 31, 2023 |  | $ | 40 |  |  | $ | 178 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | 220 |
Provision for credit loss expense (benefit) |  |  | 1 |  |  |  | (17 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (16 | )
Balance at June 30, 2023 |  | $ | 41 |  |  | $ | 161 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | 204 |
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 six months ended June 30, 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 expense (benefit) |  |  | 1 |  |  |  | (35 | ) |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | (35 | )
Balance at June 30, 2023 |  | $ | 41 |  |  | $ | 161 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | 204 |
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 June 30, 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 |  | $ | 405,819 |  |  | $ | 26,137 |  |  | $ | 3,499 |  |  | $ | 11,143 |  |  | $ | 37 |  |  | $ | 446,635 |
Baa/BBB ratings |  |  | 2,960 |  |  |  | 26,993 |  |  |  | — |  |  |  | — |  |  |  | 17 |  |  |  | 29,970 |
B ratings |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 408,779 |  |  | $ | 53,130 |  |  | $ | 3,499 |  |  | $ | 11,143 |  |  | $ | 54 |  |  | $ | 476,605 |
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:
|  | June 30, 2023 |  |  | December 31, 2022 |
|  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
|  | (in thousands) |
Maturity: |  |  |  |  |  |  |  |  |  |  |  |
Within one year |  | $ | 41,420 |  |  | $ | 41,148 |  |  | $ | 41,878 |  |  | $ | 41,652 |
After one year through five years |  |  | 158,329 |  |  |  | 151,287 |  |  |  | 165,216 |  |  |  | 159,006 |
After five years through ten years |  |  | 125,395 |  |  |  | 117,523 |  |  |  | 121,739 |  |  |  | 112,665 |
After ten years |  |  | 147,706 |  |  |  | 142,240 |  |  |  | 159,093 |  |  |  | 151,178 |
U.S. agency-based mortgage-backed securities |  |  | 3,499 |  |  |  | 3,364 |  |  |  | 3,696 |  |  |  | 3,576 |
Asset-backed securities |  |  | 52 |  |  |  | 51 |  |  |  | 66 |  |  |  | 67 |
Totals |  | $ | 476,401 |  |  | $ | 455,613 |  |  | $ | 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:
|  | June 30, 2023 |  |  | December 31, 2022 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
|  | (in thousands) |
Maturity: |  |  |  |  |  |  |  |  |  |  |  |
Within one year |  | $ | 34,515 |  |  | $ | 34,235 |  |  | $ | 28,290 |  |  | $ | 27,814 |
After one year through five years |  |  | 89,175 |  |  |  | 84,422 |  |  |  | 68,876 |  |  |  | 65,406 |
After five years through ten years |  |  | 108,099 |  |  |  | 103,279 |  |  |  | 102,296 |  |  |  | 95,366 |
After ten years |  |  | 118,283 |  |  |  | 113,386 |  |  |  | 133,147 |  |  |  | 127,089 |
U.S. agency-based mortgage-backed securities |  |  | 5,598 |  |  |  | 5,062 |  |  |  | 5,984 |  |  |  | 5,446 |
Totals |  | $ | 355,670 |  |  | $ | 340,384 |  |  | $ | 338,593 |  |  | $ | 321,121 |

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