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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