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Operating Segment Information - Summary of Revenue by Major Product Type (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | $ 282,810 | $ 241,000 | $ 551,962 | $ 469,595
Casualty Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 177,123 | 156,195 | 348,879 | 304,965
Casualty Segment | Commercial excess and personal umbrella |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 62,463 | 53,448 | 122,535 | 105,002
Casualty Segment | General liability |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 25,106 | 22,053 | 48,846 | 44,460
Casualty Segment | Commercial transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 23,941 | 21,525 | 47,569 | 38,355
Casualty Segment | Professional services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 23,861 | 21,966 | 47,416 | 43,694
Casualty Segment | Small commercial |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 16,813 | 16,279 | 33,458 | 32,001
Casualty Segment | Executive products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 7,075 | 5,083 | 13,652 | 10,324
Casualty Segment | Other casualty |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 17,864 | 15,841 | 35,403 | 31,129
Property Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 74,690 | 55,865 | 142,130 | 107,507
Property Segment | Commercial property |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 38,929 | 25,093 | 72,218 | 47,805
Property Segment | Marine |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 28,178 | 24,363 | 54,907 | 47,321
Property Segment | Specialty personal |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 6,100 | 5,264 | 11,996 | 10,298
Property Segment | Other property |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 1,483 | 1,145 | 3,009 | 2,083
Surety Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 30,997 | 28,940 | 60,953 | 57,123
Surety Segment | Commercial |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 11,663 | 11,040 | 23,366 | 22,053
Surety Segment | Miscellaneous |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | 11,587 | 10,845 | 22,940 | 21,480
Surety Segment | Contract |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums earned | $ 7,747 | $ 7,055 | $ 14,647 | $ 13,590

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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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