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Reserve for Losses and Loss Adjustment Expenses - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	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

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No definition available.

+ Details

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Namespace Prefix:	plmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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No definition available.

+ Details

Name:	us-gaap_InsuranceLossReservesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration