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Underwriting Information - Gross Written Premiums by Insurance Subsidiary (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Gross written premiums |  |  |
Amount | $ 881,868 | $ 535,175 | $ 354,360
% of GWP | 100.00% | 100.00% | 100.00%
Subsidiaries |  |  |
Gross written premiums |  |  |
Amount | $ 881,868 | $ 535,175 | $ 354,360
% of GWP | 100.00% | 100.00% | 100.00%
PSIC |  |  |
Gross written premiums |  |  |
Amount | $ 489,720 | $ 383,064 | $ 324,870
% of GWP | 55.50% | 71.60% | 91.70%
PESIC |  |  |
Gross written premiums |  |  |
Amount | $ 392,148 | $ 152,111 | $ 29,490
% of GWP | 44.50% | 28.40% | 8.30%

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- Definition Percentage of gross written premiums. + References No definition available. + Details
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Namespace Prefix: | plmr_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of direct and assumed premiums written. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
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- References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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- Details
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