v3.22.2.2
Document and Entity Information - $ / shares
 9 Months Ended
Sep. 30, 2022
Nov. 01, 2022
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2022  
Document Transition Report false  
Entity File Number 001-38873  
Entity Registrant Name Palomar Holdings, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 83-3972551  
Entity Address, Address Line One 7979 Ivanhoe Avenue  
Entity Address, Address Line Two Suite 500  
Entity Address, City or Town La Jolla  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92037  
City Area Code 619  
Local Phone Number 567-5290  
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Entity Listing, Par Value Per Share $ 0.0001  
Trading Symbol PLMR  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   25,232,736
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001761312  
Amendment Flag false