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Investments (Tables) | 6 Months Ended
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Jun. 30, 2024
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, 2024 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 |  | $ | 402,886 |  |  | $ | (36 | ) |  | $ | 402,850 |  |  | $ | 2,253 |  |  | $ | (15,940 | ) |  | $ | 389,163 |
Corporate bonds |  |  | 47,792 |  |  |  | (111 | ) |  |  | 47,681 |  |  |  | — |  |  |  | (1,997 | ) |  |  | 45,684 |
U.S. agency-based mortgage-backed securities |  |  | 3,047 |  |  |  | — |  |  |  | 3,047 |  |  |  | 9 |  |  |  | (164 | ) |  |  | 2,892 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 11,233 |  |  |  | — |  |  |  | 11,233 |  |  |  | 13 |  |  |  | (400 | ) |  |  | 10,846 |
Asset-backed securities |  |  | 25 |  |  |  | (2 | ) |  |  | 23 |  |  |  | — |  |  |  | — |  |  |  | 23 |
Totals |  | $ | 464,983 |  |  | $ | (149 | ) |  | $ | 464,834 |  |  | $ | 2,275 |  |  | $ | (18,501 | ) |  | $ | 448,608 |
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 |
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, 2024 are summarized as follows:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Allowance for Credit Losses |
|  | (in thousands) |
States and political subdivisions |  | $ | 125,271 |  |  | $ | 204 |  |  | $ | (7,586 | ) |  | $ | 117,889 |  |  | $ | — |
Corporate bonds |  |  | 154,676 |  |  |  | 1,217 |  |  |  | (4,193 | ) |  |  | 151,700 |  |  |  | — |
U.S. agency-based mortgage-backed securities |  |  | 4,861 |  |  |  | — |  |  |  | (515 | ) |  |  | 4,346 |  |  |  | — |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 14,844 |  |  |  | — |  |  |  | (1,190 | ) |  |  | 13,654 |  |  |  | — |
Totals |  | $ | 299,652 |  |  | $ | 1,421 |  |  | $ | (13,484 | ) |  | $ | 287,589 |  |  | $ | — |
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 |  |  | $ | — |
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, 2024 are summarized as follows:
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |
Domestic common stock |  | $ | 36,019 |  |  | $ | 17,851 |  |  | $ | (31 | ) |  | $ | 53,839 |
Total equity securities |  | $ | 36,019 |  |  | $ | 17,851 |  |  | $ | (31 | ) |  | $ | 53,839 |
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 |
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, 2024:
|  | 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, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 77,323 |  |  | $ | 5,454 |  |  | $ | 22,698 |  |  | $ | 2,132 |  |  | $ | 100,021 |  |  | $ | 7,586 |
Corporate bonds |  |  | 76,321 |  |  |  | 2,718 |  |  |  | 38,179 |  |  |  | 1,475 |  |  |  | 114,500 |  |  |  | 4,193 |
U.S. agency-based mortgage-backed securities |  |  | 4,115 |  |  |  | 474 |  |  |  | 230 |  |  |  | 41 |  |  |  | 4,345 |  |  |  | 515 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | — |  |  |  | — |  |  |  | 13,654 |  |  |  | 1,190 |  |  |  | 13,654 |  |  |  | 1,190 |
Total available-for-sale securities |  | $ | 157,759 |  |  | $ | 8,646 |  |  | $ | 74,761 |  |  | $ | 4,838 |  |  | $ | 232,520 |  |  | $ | 13,484 |
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, 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) |
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 |
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, 2024.
|  | 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, 2024 |  | $ | 37 |  |  | $ | 126 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | 165 |
Provision for credit loss benefit |  |  | (1 | ) |  |  | (15 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (16 | )
Balance at June 30, 2024 |  | $ | 36 |  |  | $ | 111 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | 149 |
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, 2024.
|  | 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, 2023 |  | $ | 38 |  |  | $ | 142 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | 182 |
Provision for credit loss benefit |  |  | (2 | ) |  |  | (31 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (33 | )
Balance at June 30, 2024 |  | $ | 36 |  |  | $ | 111 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | 149 |
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, 2024.
|  | 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 |  | $ | 399,946 |  |  | $ | 18,537 |  |  | $ | 3,047 |  |  | $ | 11,233 |  |  | $ | 13 |  |  | $ | 432,776 |
Baa/BBB ratings |  |  | 2,940 |  |  |  | 29,255 |  |  |  | — |  |  |  | — |  |  |  | 12 |  |  |  | 32,207 |
Total |  | $ | 402,886 |  |  | $ | 47,792 |  |  | $ | 3,047 |  |  | $ | 11,233 |  |  | $ | 25 |  |  | $ | 464,983 |
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, 2024 |  |  | December 31, 2023 |
|  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
|  | (in thousands) |
Maturity: |  |  |  |  |  |  |  |  |  |  |  |
Within one year |  | $ | 66,971 |  |  | $ | 66,374 |  |  | $ | 64,129 |  |  | $ | 63,703 |
After one year through five years |  |  | 116,482 |  |  |  | 110,911 |  |  |  | 136,854 |  |  |  | 131,396 |
After five years through ten years |  |  | 119,289 |  |  |  | 112,628 |  |  |  | 114,990 |  |  |  | 110,814 |
After ten years |  |  | 159,022 |  |  |  | 155,780 |  |  |  | 164,270 |  |  |  | 163,944 |
U.S. agency-based mortgage-backed securities |  |  | 3,047 |  |  |  | 2,892 |  |  |  | 3,297 |  |  |  | 3,199 |
Asset-backed securities |  |  | 23 |  |  |  | 23 |  |  |  | 35 |  |  |  | 36 |
Totals |  | $ | 464,834 |  |  | $ | 448,608 |  |  | $ | 483,575 |  |  | $ | 473,092 |
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, 2024 |  |  | December 31, 2023 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
|  | (in thousands) |
Maturity: |  |  |  |  |  |  |  |  |  |  |  |
Within one year |  | $ | 17,265 |  |  | $ | 17,071 |  |  | $ | 25,995 |  |  | $ | 25,875 |
After one year through five years |  |  | 108,489 |  |  |  | 104,174 |  |  |  | 106,178 |  |  |  | 102,201 |
After five years through ten years |  |  | 71,967 |  |  |  | 69,051 |  |  |  | 82,664 |  |  |  | 80,911 |
After ten years |  |  | 97,070 |  |  |  | 92,947 |  |  |  | 106,144 |  |  |  | 103,332 |
U.S. agency-based mortgage-backed securities |  |  | 4,861 |  |  |  | 4,346 |  |  |  | 5,190 |  |  |  | 4,745 |
Totals |  | $ | 299,652 |  |  | $ | 287,589 |  |  | $ | 326,171 |  |  | $ | 317,064 |

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