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Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Gross Unrealized Gains and Losses and Amortized Cost and Fair Value of Investments Classified as Held-to-maturity | The gross unrealized gains and losses on, and the amortized cost and fair value of, those investments classified as held-to-maturity at December 31, 2017 are summarized as follows:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
States and political subdivisions |  | $ | 460,428 |  |  | $ | 9,628 |  |  | $ | (955 | ) |  | $ | 469,101 |
Corporate bonds |  |  | 100,024 |  |  |  | 190 |  |  |  | (167 | ) |  |  | 100,047 |
Commercial mortgage-backed securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
U.S. agency-based mortgage-backed securities |  |  | 10,260 |  |  |  | 625 |  |  |  | (40 | ) |  |  | 10,845 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 57,657 |  |  |  | 548 |  |  |  | (198 | ) |  |  | 58,007 |
Asset-backed securities |  |  | 1,299 |  |  |  | 25 |  |  |  | (15 | ) |  |  | 1,309 |
Totals |  | $ | 629,668 |  |  | $ | 11,016 |  |  | $ | (1,375 | ) |  | $ | 639,309 |
The gross unrealized gains and losses on, and the amortized cost and fair value of, those investments classified as held-to-maturity at December 31, 2016 are summarized as follows:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
States and political subdivisions |  | $ | 394,875 |  |  | $ | 7,622 |  |  | $ | (3,014 | ) |  | $ | 399,483 |
Corporate bonds |  |  | 143,858 |  |  |  | 423 |  |  |  | (265 | ) |  |  | 144,016 |
Commercial mortgage-backed securities |  |  | 70 |  |  |  | — |  |  |  | — |  |  |  | 70 |
U.S. agency-based mortgage-backed securities |  |  | 9,967 |  |  |  | 948 |  |  |  | — |  |  |  | 10,915 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 11,737 |  |  |  | 746 |  |  |  | (67 | ) |  |  | 12,416 |
Asset-backed securities |  |  | 1,927 |  |  |  | 163 |  |  |  | (59 | ) |  |  | 2,031 |
Totals |  | $ | 562,434 |  |  | $ | 9,902 |  |  | $ | (3,405 | ) |  | $ | 568,931 |
Gross Unrealized Gains and Losses and Cost or Amortized Cost and Fair Value of Investments Classified as Available-for-sale | The gross unrealized gains and losses on, and the cost or amortized cost and fair value of, those investments classified as available-for-sale at December 31, 2017 are summarized as follows:
|  | Cost or Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
Fixed maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 244,898 |  |  | $ | 6,819 |  |  | $ | (577 | ) |  | $ | 251,140 |
Corporate bonds |  |  | 130,210 |  |  |  | 224 |  |  |  | (212 | ) |  |  | 130,222 |
U.S. agency-based mortgage-backed securities |  |  | 18,813 |  |  |  | — |  |  |  | (799 | ) |  |  | 18,014 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 67,315 |  |  |  | 29 |  |  |  | (1,126 | ) |  |  | 66,218 |
Total fixed maturity |  |  | 461,236 |  |  |  | 7,072 |  |  |  | (2,714 | ) |  |  | 465,594 |
Equity securities |  |  | 8,503 |  |  |  | 779 |  |  |  | — |  |  |  | 9,282 |
Other investments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Totals |  | $ | 469,739 |  |  | $ | 7,851 |  |  | $ | (2,714 | ) |  | $ | 474,876 |
The gross unrealized gains and losses on, and the cost or amortized cost and fair value of, those investments classified as available-for-sale at December 31, 2016 are summarized as follows:
|  | Cost or Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
Fixed maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 231,168 |  |  | $ | 4,340 |  |  | $ | (3,215 | ) |  | $ | 232,293 |
Corporate bonds |  |  | 182,350 |  |  |  | 436 |  |  |  | (271 | ) |  |  | 182,515 |
U.S. agency-based mortgage-backed securities |  |  | 10,428 |  |  |  | 17 |  |  |  | (1,103 | ) |  |  | 9,342 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 55,925 |  |  |  | — |  |  |  | (978 | ) |  |  | 54,947 |
Total fixed maturity |  |  | 479,871 |  |  |  | 4,793 |  |  |  | (5,567 | ) |  |  | 479,097 |
Equity securities |  |  | — |  |  |  | 33 |  |  |  | — |  |  |  | 33 |
Other investments |  |  | 10,000 |  |  |  | 3,330 |  |  |  | — |  |  |  | 13,330 |
Totals |  | $ | 489,871 |  |  | $ | 8,156 |  |  | $ | (5,567 | ) |  | $ | 492,460 |
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 2017, 2016 and 2015 is as follows:
|  | Fixed Maturity Securities Available for Sale |  |  | Equity Securities |  |  | Other |  |  | Total |
|  | (in thousands) |
Year ended December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  | $ | 14,591 |  |  | $ | 1 |  |  | $ | 13,172 |  |  | $ | 27,764 |
Gross realized investment gains |  | $ | 485 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 486 |
Gross realized investment (losses) |  |  | (5 | ) |  |  | — |  |  |  | — |  |  |  | (5 | )
Net realized investment gains |  |  | 480 |  |  |  | 1 |  |  |  | — |  |  |  | 481 |
Other, including losses on calls and redemptions |  |  | (520 | ) |  |  | — |  |  |  | (608 | ) |  |  | (1,128 | )
Net realized gains (losses) on investments |  | $ | (40 | ) |  | $ | 1 |  |  | $ | (608 | ) |  | $ | (647 | )
Year ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  | $ | 54,730 |  |  | $ | — |  |  | $ | 4,609 |  |  | $ | 59,339 |
Gross realized investment gains |  | $ | 823 |  |  | $ | — |  |  | $ | 68 |  |  | $ | 891 |
Gross realized investment (losses) |  |  | (1,728 | ) |  |  | — |  |  |  | — |  |  |  | (1,728 | )
Net realized investment gains (losses) |  |  | (905 | ) |  |  | — |  |  |  | 68 |  |  |  | (837 | )
Other, including gains on calls and redemptions |  |  | 274 |  |  |  | — |  |  |  | 69 |  |  |  | 343 |
Net realized gains (losses) on investments |  | $ | (631 | ) |  | $ | — |  |  | $ | 137 |  |  | $ | (494 | )
Year ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  | $ | 4,432 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,432 |
Gross realized investment gains |  | $ | 177 |  |  | $ | — |  |  | $ | — |  |  | $ | 177 |
Gross realized investment (losses) |  |  | (162 | ) |  |  | — |  |  |  | — |  |  |  | (162 | )
Net realized investment gains |  |  | 15 |  |  |  | — |  |  |  | — |  |  |  | 15 |
Impairments |  |  | (2,653 | ) |  |  | — |  |  |  | — |  |  |  | (2,653 | )
Other, including gains on calls and redemptions |  |  | 102 |  |  |  | — |  |  |  | 42 |  |  |  | 144 |
Net realized gains (losses) on investments |  | $ | (2,536 | ) |  | $ | — |  |  | $ | 42 |  |  | $ | (2,494 | )
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, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
Gross investment income: |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities |  | $ | 28,961 |  |  | $ | 27,837 |  |  | $ | 28,498 |
Equity securities |  |  | 201 |  |  |  | — |  |  |  | — |
Short-term investments and cash and cash equivalents |  |  | 1,117 |  |  |  | 348 |  |  |  | 149 |
Other investments |  |  | 104 |  |  |  | 1,568 |  |  |  | 763 |
Total gross investment income |  |  | 30,383 |  |  |  | 29,753 |  |  |  | 29,410 |
Investment expenses |  |  | (1,102 | ) |  |  | (1,647 | ) |  |  | (1,508 | )
Net investment income |  | $ | 29,281 |  |  | $ | 28,106 |  |  | $ | 27,902 |
Investment Securities Continuous Unrealized Loss Position | The following table summarizes the fair value and gross unrealized losses on securities, 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, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 110,698 |  |  | $ | 654 |  |  | $ | 19,895 |  |  | $ | 301 |  |  | $ | 130,593 |  |  | $ | 955 |
Corporate bonds |  |  | 56,425 |  |  |  | 156 |  |  |  | 4,121 |  |  |  | 11 |  |  |  | 60,546 |  |  |  | 167 |
U.S. agency-based mortgage-backed securities |  |  | 2,798 |  |  |  | 40 |  |  |  | — |  |  |  | — |  |  |  | 2,798 |  |  |  | 40 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 48,153 |  |  |  | 122 |  |  |  | 3,948 |  |  |  | 76 |  |  |  | 52,101 |  |  |  | 198 |
Asset-backed securities |  |  | — |  |  |  | — |  |  |  | 967 |  |  |  | 15 |  |  |  | 967 |  |  |  | 15 |
Total held-to-maturity securities |  |  | 218,074 |  |  |  | 972 |  |  |  | 28,931 |  |  |  | 403 |  |  |  | 247,005 |  |  |  | 1,375 |
Available-for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 23,365 |  |  | $ | 86 |  |  | $ | 19,153 |  |  | $ | 491 |  |  | $ | 42,518 |  |  | $ | 577 |
Corporate bonds |  |  | 82,795 |  |  |  | 171 |  |  |  | 5,888 |  |  |  | 41 |  |  |  | 88,683 |  |  |  | 212 |
U.S. agency-based mortgage-backed securities |  |  | 14,686 |  |  |  | 59 |  |  |  | 3,328 |  |  |  | 740 |  |  |  | 18,014 |  |  |  | 799 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 14,730 |  |  |  | 204 |  |  |  | 47,716 |  |  |  | 922 |  |  |  | 62,446 |  |  |  | 1,126 |
Total available-for-sale securities |  |  | 135,576 |  |  |  | 520 |  |  |  | 76,085 |  |  |  | 2,194 |  |  |  | 211,661 |  |  |  | 2,714 |
Total |  | $ | 353,650 |  |  | $ | 1,492 |  |  | $ | 105,016 |  |  | $ | 2,597 |  |  | $ | 458,666 |  |  | $ | 4,089 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 157,507 |  |  | $ | 3,014 |  |  | $ | — |  |  | $ | — |  |  | $ | 157,507 |  |  | $ | 3,014 |
Corporate bonds |  |  | 44,654 |  |  |  | 202 |  |  |  | 6,292 |  |  |  | 63 |  |  |  | 50,946 |  |  |  | 265 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 3,968 |  |  |  | 67 |  |  |  | — |  |  |  | — |  |  |  | 3,968 |  |  |  | 67 |
Asset-backed securities |  |  | — |  |  |  | — |  |  |  | 1,173 |  |  |  | 59 |  |  |  | 1,173 |  |  |  | 59 |
Total held-to-maturity securities |  |  | 206,129 |  |  |  | 3,283 |  |  |  | 7,465 |  |  |  | 122 |  |  |  | 213,594 |  |  |  | 3,405 |
Available-for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 73,505 |  |  | $ | 2,976 |  |  | $ | 4,523 |  |  | $ | 239 |  |  | $ | 78,028 |  |  | $ | 3,215 |
Corporate bonds |  |  | 41,419 |  |  |  | 111 |  |  |  | 7,922 |  |  |  | 160 |  |  |  | 49,341 |  |  |  | 271 |
U.S. agency-based mortgage-backed securities |  |  | 3,702 |  |  |  | 48 |  |  |  | 3,607 |  |  |  | 1,055 |  |  |  | 7,309 |  |  |  | 1,103 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 54,947 |  |  |  | 978 |  |  |  | — |  |  |  | — |  |  |  | 54,947 |  |  |  | 978 |
Total available-for-sale securities |  |  | 173,573 |  |  |  | 4,113 |  |  |  | 16,052 |  |  |  | 1,454 |  |  |  | 189,625 |  |  |  | 5,567 |
Total |  | $ | 379,702 |  |  | $ | 7,396 |  |  | $ | 23,517 |  |  | $ | 1,576 |  |  | $ | 403,219 |  |  | $ | 8,972 |
Held-to-Maturity Securities [Member] |
Summary of 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 held-to-maturity at December 31, 2017, by contractual maturity, is as follows:
|  | Amortized Cost |  |  | Fair Value |
|  | (in thousands) |
Maturity: |  |  |  |  |  |  |  |
Within one year |  | $ | 88,215 |  |  | $ | 88,556 |
After one year through five years |  |  | 271,580 |  |  |  | 273,810 |
After five years through ten years |  |  | 98,748 |  |  |  | 100,745 |
After ten years |  |  | 159,566 |  |  |  | 164,044 |
U.S. agency-based mortgage-backed securities |  |  | 10,260 |  |  |  | 10,845 |
Asset-backed securities |  |  | 1,299 |  |  |  | 1,309 |
Totals |  | $ | 629,668 |  |  | $ | 639,309 |
Available-for-Sale Securities [Member] |
Summary of 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 at December 31, 2017, by contractual maturity, is as follows:
|  | Amortized Cost |  |  | Fair Value |
|  | (in thousands) |
Maturity: |  |  |  |  |  |  |  |
Within one year |  | $ | 76,194 |  |  | $ | 76,211 |
After one year through five years |  |  | 153,483 |  |  |  | 153,092 |
After five years through ten years |  |  | 43,442 |  |  |  | 43,606 |
After ten years |  |  | 169,304 |  |  |  | 174,671 |
U.S. agency-based mortgage-backed securities |  |  | 18,813 |  |  |  | 18,014 |
Totals |  | $ | 461,236 |  |  | $ | 465,594 |

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