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v3.22.4

Reserve for Losses and Loss Adjustment Expenses - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reserve for Losses and Loss Adjustment Expenses |  |  |
Loss and loss adjustment expense (deficiency) reserve redundancy | $ (2.4) | $ 3.6 | $ 0.1

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- Definition Loss and Loss Adjustment Expense Reserve Redundancy + References No definition available. + Details
Name: | plmr_LossAndLossAdjustmentExpenseReserveRedundancy
Namespace Prefix: | plmr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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