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Investments (Tables) | 12 Months Ended
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Dec. 31, 2022
Investments |
Schedule of available-for-sale investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
December 31, 2022 | ​ | Cost or Cost | ​ | Gains | ​ | Losses | ​ | Value
​ |  | (in thousands)
Fixed maturities: |  | ​ | ​ |  | ​ |  |  | ​ |  |  | ​ |
U.S. Governments | ​ | $ | 50,802 | ​ | $ | 2 | ​ | $ | (2,253) | ​ | $ | 48,551
States, territories, and possessions | ​ |  | 5,857 | ​ |  | 49 | ​ | ​ | (552) | ​ |  | 5,354
Political subdivisions | ​ |  | 4,919 | ​ |  | — | ​ |  | (621) | ​ |  | 4,298
Special revenue excluding mortgage/asset-backed securities | ​ |  | 37,260 | ​ |  | 26 | ​ |  | (4,487) | ​ |  | 32,799
Industrial and miscellaneous | ​ |  | 278,164 | ​ |  | 79 | ​ | ​ | (24,148) | ​ |  | 254,095
Mortgage/asset-backed securities | ​ |  | 184,578 | ​ |  | 251 | ​ |  | (14,862) | ​ |  | 169,967
Total available-for-sale investments | ​ | $ | 561,580 | ​ | $ | 407 | ​ | $ | (46,923) | ​ | $ | 515,064
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
December 31, 2021 | ​ | Cost or Cost | ​ | Gains | ​ | Losses | ​ | Value
​ |  | (in thousands)
Fixed maturities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. Governments | ​ | $ | 16,713 | ​ | $ | 347 | ​ | $ | (190) | ​ | $ | 16,870
States, territories, and possessions | ​ |  | 3,789 | ​ |  | 288 | ​ |  | (63) | ​ |  | 4,014
Political subdivisions | ​ |  | 6,295 | ​ |  | 107 | ​ |  | (22) | ​ |  | 6,380
Special revenue excluding mortgage/asset-backed securities | ​ |  | 43,301 | ​ |  | 1,273 | ​ |  | (76) | ​ |  | 44,498
Industrial and miscellaneous | ​ |  | 245,064 | ​ |  | 5,873 | ​ | ​ | (1,891) | ​ |  | 249,046
Mortgage/asset-backed securities | ​ |  | 110,960 | ​ |  | 1,377 | ​ |  | (463) | ​ |  | 111,874
Total available-for-sale investments | ​ | $ | 426,122 | ​ | $ | 9,265 | ​ | $ | (2,705) | ​ | $ | 432,682
​
Schedule of aggregate fair value and gross unrealized losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | More Than 12 Months | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
December 31, 2022 | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
​ | ​ | (in thousands)
Fixed maturity securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. Governments |  | $ | 41,077 | ​ | $ | (1,523) | ​ | $ | 6,853 | ​ | $ | (730) | ​ | $ | 47,930 | ​ | $ | (2,253)
States, territories, and possessions |  | ​ | 3,227 | ​ | ​ | (552) | ​ |  | — | ​ |  | — | ​ |  | 3,227 | ​ |  | (552)
Political subdivisions |  | ​ | 4,298 | ​ | ​ | (621) | ​ |  | — | ​ |  | — | ​ |  | 4,298 | ​ |  | (621)
Special revenue excluding mortgage/asset-backed securities |  | ​ | 25,091 | ​ | ​ | (3,287) | ​ |  | 5,080 | ​ |  | (1,200) | ​ |  | 30,171 | ​ |  | (4,487)
Industrial and miscellaneous |  | ​ | 192,185 | ​ | ​ | (15,667) | ​ |  | 55,605 | ​ |  | (8,481) | ​ |  | 247,790 | ​ |  | (24,148)
Mortgage/asset-backed securities |  | ​ | 118,815 | ​ | ​ | (9,908) | ​ |  | 32,448 | ​ |  | (4,954) | ​ |  | 151,263 | ​ |  | (14,862)
Total | ​ | $ | 384,693 | ​ | $ | (31,558) | ​ | $ | 99,986 | ​ | $ | (15,365) | ​ | $ | 484,679 | ​ | $ | (46,923)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | More Than 12 Months | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
December 31, 2021 | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
​ | ​ | (in thousands)
Fixed maturity securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. Governments | ​ | $ | 5,968 | ​ | $ | (147) | ​ | $ | 1,457 | ​ | $ | (43) | ​ | $ | 7,425 | ​ | $ | (190)
States, territories, and possessions | ​ |  | 1,444 | ​ | ​ | (63) | ​ |  | — | ​ |  | — | ​ |  | 1,444 | ​ |  | (63)
Political subdivisions | ​ |  | 1,815 | ​ | ​ | (22) | ​ |  | — | ​ |  | — | ​ |  | 1,815 | ​ |  | (22)
Special revenue excluding mortgage/asset-backed securities | ​ |  | 6,280 | ​ | ​ | (76) | ​ |  | — | ​ |  | — | ​ |  | 6,280 | ​ |  | (76)
Industrial and miscellaneous | ​ |  | 94,020 | ​ | ​ | (1,468) | ​ |  | 5,570 | ​ |  | (423) | ​ |  | 99,590 | ​ |  | (1,891)
Mortgage/asset-backed securities | ​ |  | 51,246 | ​ | ​ | (412) | ​ |  | 2,319 | ​ |  | (51) | ​ |  | 53,565 | ​ |  | (463)
Total | ​ | $ | 160,773 | ​ | $ | (2,188) | ​ | $ | 9,346 | ​ | $ | (517) | ​ | $ | 170,119 | ​ | $ | (2,705)
​
Schedule of contractual maturities of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized |  | Fair
​ | ​ | Cost | ​ | Value
​ |  | (in thousands)
Due within one year | ​ | $ | 41,686 | ​ | $ | 41,106
Due after one year through five years | ​ |  | 182,785 | ​ |  | 170,399
Due after five years through ten years | ​ |  | 126,990 | ​ |  | 112,822
Due after ten years | ​ |  | 25,541 | ​ |  | 20,770
Mortgage and asset-backed securities | ​ |  | 184,578 | ​ |  | 169,967
​ | ​ | $ | 561,580 | ​ | $ | 515,064
​
Schedule of change in unrealized gains (losses) of investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2022 |  | 2021 |  | 2020
​ | ​ | (in thousands)
Change in net unrealized gains (losses) | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Fixed maturities | ​ | $ | (53,076) | ​ | $ | (10,148) | ​ | $ | 10,835
Net increase (decrease) | ​ | $ | (53,076) | ​ | $ | (10,148) | ​ | $ | 10,835
​
Schedule of net investment income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2022 |  | 2021 |  | 2020
​ |  | (in thousands)
Interest income | ​ | $ | 13,631 | ​ | $ | 9,119 | ​ | $ | 8,554
Dividend income | ​ |  | 739 | ​ |  | 461 | ​ |  | 489
Investment management fees and expenses | ​ |  | (493) | ​ |  | (500) | ​ |  | (431)
Net investment income | ​ | $ | 13,877 | ​ | $ | 9,080 | ​ | $ | 8,612
​
Schedule of net realized and unrealized investment gains and losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended
​ | ​ | December 31,
​ |  | 2022 |  | 2021 |  | 2020
​ | ​ |  | (in thousands)
Realized gains: | ​ |  |  | ​ |  |  | ​ |  |
Gains on sales of fixed maturity securities | ​ | $ | 14 | ​ | $ | 466 | ​ | $ | 501
Gains on sales of equity securities | ​ |  | — | ​ |  | 1,416 | ​ |  | 62
Total realized gains | ​ |  | 14 | ​ |  | 1,882 | ​ |  | 563
Realized losses: | ​ |  |  | ​ |  |  | ​ |  |
Losses on sales of fixed maturity securities | ​ |  | (2,340) | ​ | ​ | (1) | ​ | ​ | (46)
Losses on sales of equity securities | ​ |  | — | ​ | ​ | — | ​ | ​ | (68)
Total realized losses | ​ |  | (2,340) | ​ |  | (1) | ​ |  | (114)
Net realized investment gains (losses) | ​ |  | (2,326) | ​ |  | 1,881 | ​ |  | 449
Net unrealized gains (losses) on equity securities | ​ |  | (5,203) | ​ |  | (604) | ​ |  | 1,039
Net realized and unrealized gains (losses) on investments | ​ | $ | (7,529) | ​ | $ | 1,277 | ​ | $ | 1,488
​

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