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Investments (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015 are summarized as follows:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
States and political subdivisions |  | $ | 408,447 |  |  | $ | 15,352 |  |  | $ | (45) |  |  | $ | 423,754 |
Corporate bonds |  |  | 171,224 |  |  |  | 159 |  |  |  | (810) |  |  |  | 170,573 |
Commercial mortgage-backed securities |  |  | 37,494 |  |  |  | 204 |  |  |  | (15) |  |  |  | 37,683 |
U.S. agency-based mortgage-backed securities |  |  | 13,223 |  |  |  | 1,249 |  |  |  | (1) |  |  |  | 14,471 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 12,487 |  |  |  | 897 |  |  |  | (4) |  |  |  | 13,380 |
Asset-backed securities |  |  | 2,289 |  |  |  | 202 |  |  |  | (76) |  |  |  | 2,415 |
Totals |  | $ | 645,164 |  |  | $ | 18,063 |  |  | $ | (951) |  |  | $ | 662,276 |
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, 2014 are summarized as follows:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
States and political subdivisions |  | $ | 385,623 |  |  | $ | 20,100 |  |  | $ | (58) |  |  | $ | 405,665 |
Corporate bonds |  |  | 176,880 |  |  |  | 374 |  |  |  | (520) |  |  |  | 176,734 |
Commercial mortgage-backed securities |  |  | 46,662 |  |  |  | 1,867 |  |  |  | — |  |  |  | 48,529 |
U.S. agency-based mortgage-backed securities |  |  | 16,972 |  |  |  | 1,702 |  |  |  | (2) |  |  |  | 18,672 |
U.S. Treasury securities and obligations of U.S. government agencies |  |  | 10,697 |  |  |  | 1,097 |  |  |  | (2) |  |  |  | 11,792 |
Asset-backed securities |  |  | 2,797 |  |  |  | 264 |  |  |  | (82) |  |  |  | 2,979 |
Totals |  | $ | 639,631 |  |  | $ | 25,404 |  |  | $ | (664) |  |  | $ | 664,371 |
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, 2015 are summarized as follows:
|  | Cost or Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
Fixed maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 164,684 |  |  | $ | 6,942 |  |  | $ | (207 | ) |  | $ | 171,419 |
Corporate bonds |  |  | 202,537 |  |  |  | 253 |  |  |  | (1,486 | ) |  |  | 201,304 |
U.S. agency-based mortgage-backed securities |  |  | 8,888 |  |  |  | 4 |  |  |  | (1,593 | ) |  |  | 7,299 |
Total fixed maturity |  |  | 376,109 |  |  |  | 7,199 |  |  |  | (3,286 | ) |  |  | 380,022 |
Other investments |  |  | 10,000 |  |  |  | 2,217 |  |  |  | — |  |  |  | 12,217 |
Equity securities |  |  | — |  |  |  | 31 |  |  |  | — |  |  |  | 31 |
Totals |  | $ | 386,109 |  |  | $ | 9,447 |  |  | $ | (3,286 | ) |  | $ | 392,270 |
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, 2014 are summarized as follows:
|  | Cost or Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
Fixed maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
States and political subdivisions |  | $ | 151,744 |  |  | $ | 7,302 |  |  | $ | (1,672 | ) |  | $ | 157,374 |
Corporate bonds |  |  | 165,412 |  |  |  | 428 |  |  |  | (470 | ) |  |  | 165,370 |
U.S. agency-based mortgage-backed securities |  |  | 9,848 |  |  |  | 2 |  |  |  | (1,352 | ) |  |  | 8,498 |
Total fixed maturity |  |  | 327,004 |  |  |  | 7,732 |  |  |  | (3,494 | ) |  |  | 331,242 |
Other investments |  |  | 10,000 |  |  |  | 1,748 |  |  |  | — |  |  |  | 11,748 |
Equity securities |  |  | — |  |  |  | 28 |  |  |  | — |  |  |  | 28 |
Totals |  | $ | 337,004 |  |  | $ | 9,508 |  |  | $ | (3,494 | ) |  | $ | 343,018 |
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 2015, 2014 and 2013 is as follows:
|  | Fixed Maturity Securities Available for Sale |  |  | Equity Securities |  |  | Other |  |  | Total |
|  | (in thousands) |
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 | )
Year ended December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  | $ | 768 |  |  | $ | 9,780 |  |  | $ | — |  |  | $ | 10,548 |
Gross realized investment gains |  | $ | 1 |  |  | $ | 749 |  |  | $ | — |  |  | $ | 750 |
Gross realized investment (losses) |  |  | — |  |  |  | (451 | ) |  |  | — |  |  |  | (451 | )
Net realized investment gains |  |  | 1 |  |  |  | 298 |  |  |  | — |  |  |  | 299 |
Impairments |  |  | (222 | ) |  |  | — |  |  |  | — |  |  |  | (222 | )
Other, including gains on calls and redemptions |  |  | 244 |  |  |  | — |  |  |  | 376 |  |  |  | 620 |
Net realized gains on investments |  | $ | 23 |  |  | $ | 298 |  |  | $ | 376 |  |  | $ | 697 |
Year ended December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  | $ | 2,090 |  |  | $ | 8,900 |  |  | $ | — |  |  | $ | 10,990 |
Gross realized investment gains |  | $ | 90 |  |  | $ | 1,264 |  |  | $ | — |  |  | $ | 1,354 |
Gross realized investment (losses) |  |  | — |  |  |  | (471 | ) |  |  | — |  |  |  | (471 | )
Net realized investment gains |  |  | 90 |  |  |  | 793 |  |  |  | — |  |  |  | 883 |
Impairments |  |  | — |  |  |  | (2,229 | ) |  |  | — |  |  |  | (2,229 | )
Other, including gains on calls and redemptions |  |  | 38 |  |  |  | — |  |  |  | 97 |  |  |  | 135 |
Net realized gains (losses) on investments |  | $ | 128 |  |  | $ | (1,436 | ) |  | $ | 97 |  |  | $ | (1,211 | )
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, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | (in thousands) |
Gross investment income: |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities |  | $ | 28,498 |  |  | $ | 26,622 |  |  | $ | 26,422 |
Short-term investments and cash and cash equivalents |  |  | 149 |  |  |  | 426 |  |  |  | 634 |
Equity securities |  |  | — |  |  |  | 232 |  |  |  | 543 |
Other investments |  |  | 763 |  |  |  | 1,611 |  |  |  | 803 |
Total gross investment income |  |  | 29,410 |  |  |  | 28,891 |  |  |  | 28,402 |
Investment expenses |  |  | (1,508 | ) |  |  | (1,677 | ) |  |  | (1,373 | )
Net investment income |  | $ | 27,902 |  |  | $ | 27,214 |  |  | $ | 27,029 |
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, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 128,436 |  |  | $ | 687 |  |  | $ | 18,139 |  |  | $ | 123 |  |  | $ | 146,575 |  |  | $ | 810 |
States and political subdivisions |  |  | 24,068 |  |  |  | 45 |  |  |  | — |  |  |  | — |  |  |  | 24,068 |  |  |  | 45 |
U.S. Treasury securities and obligations of U.S. Government agencies |  |  | 2,980 |  |  |  | 4 |  |  |  | — |  |  |  | — |  |  |  | 2,980 |  |  |  | 4 |
U.S. agency-based mortgage-backed securities |  |  | 18 |  |  |  | — |  |  |  | 28 |  |  |  | 1 |  |  |  | 46 |  |  |  | 1 |
Asset-backed securities |  |  | — |  |  |  | — |  |  |  | 1,389 |  |  |  | 76 |  |  |  | 1,389 |  |  |  | 76 |
Commercial mortgage-backed securities |  |  | 9,784 |  |  |  | 15 |  |  |  | — |  |  |  | — |  |  |  | 9,784 |  |  |  | 15 |
Total held-to-maturity securities |  |  | 165,286 |  |  |  | 751 |  |  |  | 19,556 |  |  |  | 200 |  |  |  | 184,842 |  |  |  | 951 |
Available-for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 141,857 |  |  | $ | 1,475 |  |  | $ | 4,216 |  |  | $ | 11 |  |  | $ | 146,073 |  |  | $ | 1,486 |
States and political subdivisions |  |  | 6,560 |  |  |  | 9 |  |  |  | 4,439 |  |  |  | 198 |  |  |  | 10,999 |  |  |  | 207 |
U.S. agency-based mortgage-backed securities |  |  | 434 |  |  |  | 37 |  |  |  | 6,794 |  |  |  | 1,556 |  |  |  | 7,228 |  |  |  | 1,593 |
Total available-for-sale securities |  |  | 148,851 |  |  |  | 1,521 |  |  |  | 15,449 |  |  |  | 1,765 |  |  |  | 164,300 |  |  |  | 3,286 |
Total |  | $ | 314,137 |  |  | $ | 2,272 |  |  | $ | 35,005 |  |  | $ | 1,965 |  |  | $ | 349,142 |  |  | $ | 4,237 |
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 129,788 |  |  | $ | 520 |  |  | $ | — |  |  | $ | — |  |  | $ | 129,788 |  |  | $ | 520 |
States and political subdivisions |  |  | 16,896 |  |  |  | 58 |  |  |  | — |  |  |  | — |  |  |  | 16,896 |  |  |  | 58 |
U.S. Treasury securities and obligations of U.S. Government agencies |  |  | 3,385 |  |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | 3,385 |  |  |  | 2 |
U.S. agency-based mortgage-backed securities |  |  | 78 |  |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | 78 |  |  |  | 2 |
Asset-backed securities |  |  | — |  |  |  | — |  |  |  | 1,662 |  |  |  | 82 |  |  |  | 1,662 |  |  |  | 82 |
Total held-to-maturity securities |  |  | 150,147 |  |  |  | 582 |  |  |  | 1,662 |  |  |  | 82 |  |  |  | 151,809 |  |  |  | 664 |
Available-for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 106,185 |  |  | $ | 470 |  |  | $ | — |  |  | $ | — |  |  | $ | 106,185 |  |  | $ | 470 |
States and political subdivisions |  |  | 3,810 |  |  |  | 6 |  |  |  | 10,347 |  |  |  | 1,666 |  |  |  | 14,157 |  |  |  | 1,672 |
U.S. agency-based mortgage-backed securities |  |  | 627 |  |  |  | 11 |  |  |  | 7,757 |  |  |  | 1,341 |  |  |  | 8,384 |  |  |  | 1,352 |
Total available-for-sale securities |  |  | 110,622 |  |  |  | 487 |  |  |  | 18,104 |  |  |  | 3,007 |  |  |  | 128,726 |  |  |  | 3,494 |
Total |  | $ | 260,769 |  |  | $ | 1,069 |  |  | $ | 19,766 |  |  | $ | 3,089 |  |  | $ | 280,535 |  |  | $ | 4,158 |
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, 2015, by contractual maturity, is as follows:
|  | Amortized Cost |  |  | Fair Value |
|  | (in thousands) |
Maturity: |  |  |  |  |  |  |  |
Within one year |  | $ | 112,187 |  |  | $ | 112,830 |
After one year through five years |  |  | 299,100 |  |  |  | 306,633 |
After five years through ten years |  |  | 109,901 |  |  |  | 114,362 |
After ten years |  |  | 70,970 |  |  |  | 73,882 |
U.S. agency-based mortgage-backed securities |  |  | 13,223 |  |  |  | 14,471 |
Commercial mortgage-backed securities |  |  | 37,494 |  |  |  | 37,683 |
Asset-backed securities |  |  | 2,289 |  |  |  | 2,415 |
Totals |  | $ | 645,164 |  |  | $ | 662,276 |
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, 2015, by contractual maturity, is as follows:
|  | Amortized Cost |  |  | Fair Value |
|  | (in thousands) |
Maturity: |  |  |  |  |  |  |  |
Within one year |  | $ | 32,687 |  |  | $ | 32,724 |
After one year through five years |  |  | 206,409 |  |  |  | 206,375 |
After five years through ten years |  |  | 19,394 |  |  |  | 19,585 |
After ten years |  |  | 108,731 |  |  |  | 114,039 |
U.S. agency-based mortgage-backed securities |  |  | 8,888 |  |  |  | 7,299 |
Totals |  | $ | 376,109 |  |  | $ | 380,022 |

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