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Commitments and Contingencies - Trust Account (Details) $ in Millions	Dec. 31, 2022 USD ($)
Commitments and Contingencies
Trust, par value	$ 37.2

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- Definition

Trust, Par Value

+ References

No definition available.

+ Details

Name:	plmr_TrustParValue
Namespace Prefix:	plmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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