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Geographical Breakdown of Gross Written Premium (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Geographical Breakdown of Gross Written Premium |  |
Gross written premium by state | The Company has a single reportable segment and offers insurance coverage under the homeowners multi-peril and inland marine lines of business. Gross written premium by jurisdiction are as follows ($ in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended September 30, |  | Nine Months Ended September 30, |
​ | ​ | 2020 | ​ | 2019 | ​ | 2020 | ​ | 2019 |
Jurisdiction | ​ | Amount | ​ | % of GWP | ​ | Amount | ​ | % of GWP | ​ | Amount | ​ | % of GWP | ​ | Amount | ​ | % of GWP |
Texas | ​ | $ | 15.9 |  | 22.3 | % | $ | 9.3 |  | 24.5 | % | $ | 36.5 |  | 23.4 | % | $ | 21.3 |  | 25.8 | %
California | ​ |  | 15.6 |  | 21.9 | % |  | 9.3 |  | 24.5 | % |  | 34.9 |  | 22.4 | % |  | 20.6 |  | 24.9 | %
New York | ​ |  | 8.6 |  | 12.1 | % |  | 5.0 |  | 13.2 | % |  | 18.8 |  | 12.1 | % |  | 11.5 |  | 13.9 | %
Georgia | ​ |  | 3.8 |  | 5.3 | % |  | 2.0 |  | 5.3 | % |  | 8.7 |  | 5.6 | % |  | 4.4 |  | 5.3 | %
Illinois | ​ |  | 3.4 |  | 4.8 | % |  | 1.9 |  | 5.0 | % |  | 7.6 |  | 4.9 | % |  | 3.9 |  | 4.7 | %
New Jersey | ​ |  | 3.0 |  | 4.2 | % |  | 1.5 |  | 3.9 | % |  | 6.1 |  | 3.9 | % |  | 3.4 |  | 4.1 | %
Michigan | ​ |  | 2.0 |  | 2.8 | % |  | 1.1 |  | 2.8 | % |  | 4.4 |  | 2.8 | % |  | 2.2 |  | 2.7 | %
Pennsylvania | ​ |  | 2.0 |  | 2.8 | % |  | 1.0 |  | 2.6 | % |  | 3.8 |  | 2.4 | % |  | 2.0 |  | 2.4 | %
Ohio | ​ |  | 1.8 |  | 2.5 | % |  | 0.9 |  | 2.4 | % |  | 4.0 |  | 2.6 | % |  | 2.2 |  | 2.7 | %
Arizona | ​ |  | 1.5 |  | 2.1 | % |  | 0.8 |  | 2.1 | % |  | 3.4 |  | 2.2 | % |  | 1.7 |  | 2.1 | %
All other | ​ |  | 13.6 |  | 19.2 | % |  | 5.2 |  | 13.7 | % |  | 27.8 |  | 17.7 | % |  | 9.5 |  | 11.4 | %
​ | ​ | $ | 71.2 |  | 100.0 | % | $ | 38.0 |  | 100.0 | % | $ | 156.0 |  | 100.0 | % | $ | 82.7 |  | 100.0 | %
| The Company has a single reportable segment and offers insurance coverage under a single line of business, homeowners multi-peril. Gross written premium by state is as follows ($ in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31, |
​ | ​ | 2018 | ​ | 2019 |
State | ​ | Amount | ​ | % of GWP | ​ | Amount | ​ | % of GWP |
California |  | $ | 12.5 | ​ | 26.7 | % | $ | 29.0 |  | 25.0 | %
Texas | ​ | ​ | 13.4 | ​ | 28.6 | % | ​ | 28.6 | ​ | 24.7 | %
New York |  | ​ | 7.3 |  | 15.6 | % | ​ | 15.8 | ​ | 13.6 | %
Georgia |  | ​ | 2.2 |  | 4.7 | % | ​ | 6.2 | ​ | 5.4 | %
Illinois |  | ​ | 2.5 |  | 5.3 | % | ​ | 5.2 | ​ | 4.5 | %
New Jersey |  | ​ | 1.7 |  | 3.6 | % | ​ | 4.7 | ​ | 4.1 | %
Michigan |  | ​ | 0.9 |  | 1.9 | % | ​ | 3.2 | ​ | 2.8 | %
Ohio |  | ​ | 1.3 |  | 2.8 | % | ​ | 2.9 | ​ | 2.5 | %
Pennsylvania |  | ​ | 1.1 |  | 2.4 | % | ​ | 2.7 | ​ | 2.3 | %
Arizona |  | ​ | 0.8 |  | 1.7 | % | ​ | 2.5 | ​ | 2.2 | %
All other |  | ​ | 3.1 |  | 6.7 | % | ​ | 15.0 | ​ | 12.9 | %
​ | ​ | $ | 46.8 |  | 100.0 | % | $ | 115.8 | ​ | 100.0 | %

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