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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Feb. 20, 2026
Jun. 30, 2025
Document Information [Line Items]      
Entity Central Index Key 0001761312    
Entity Registrant Name Palomar Holdings, Inc.    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Entity File Number 001-38873    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 83-3972551    
Entity Address, Address Line One 7979 Ivanhoe Avenue, 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    
Trading Symbol PLMR    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 4,034,049,965
Entity Common Stock, Shares Outstanding   26,689,745  
Documents Incorporated by Reference [Text Block]

DOCUMENTS INCORPORATED BY REFERENCE:

Portions of the registrant’s definitive proxy statement relating to its 2026 annual meeting of stockholders (the “2026 Proxy Statement”) are incorporated by reference into Part III of this Annual Report on Form 10-K. The 2026 Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.

    
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location San Francisco, California    
Auditor Opinion [Text Block]

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Palomar Holdings, Inc. and subsidiaries (the Company) as of December 31, 2025 and 2024, the related consolidated statements of income and comprehensive income, stockholders’ equity and cash flows for each of the three years in the period ended December 31, 2025, and the related notes and financial statement schedules listed in the Index at Item 15(a) (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2025 and 2024, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2025, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 24, 2026 expressed an unqualified opinion thereon.