XML 117 R103.htm IDEA: XBRL DOCUMENT
v3.22.4

Underwriting Information - Additional Information (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) item | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Underwriting Information |  |  |
Gross written premiums | $ 881,868 | $ 535,175 | $ 354,360
% of GWP | 100.00% | 100.00% | 100.00%
Number of program administrators | item | 2 |  |
Sales Revenue | Product Concentration Risk |  |  |
Underwriting Information |  |  |
Gross written premiums | $ 417,500 | $ 255,800 | $ 191,300
% of GWP | 47.30% | 48.20% | 54.00%

X
- Definition Represents the number of program administrators. + References No definition available. + Details
Name: | plmr_NumberOfProgramAdministrators
Namespace Prefix: | plmr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of gross written premiums. + References No definition available. + Details
Name: | plmr_PercentageOfGrossWrittenPremiums
Namespace Prefix: | plmr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of direct and assumed premiums written. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
Name: | us-gaap_PremiumsWrittenGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_ProductConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |