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v3.22.4

Significant Accounting Policies - Premiums Earned (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Significant Accounting Policies |  |
Premium deficiency | $ 0 | $ 0

X
- Definition Amount in which expected losses and loss adjustment expenses, unamortized acquisition costs, and policy maintenance costs exceeds the remaining unearned premiums. + References No definition available. + Details
Name: | plmr_PremiumDeficiency
Namespace Prefix: | plmr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration