v3.26.1
Segment Information - Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]            
Total operating revenue $ 1,089,796   $ 1,060,097   $ 2,101,707 $ 2,049,496
Total operating expenses 885,673   860,924   1,730,797 1,698,947
Operating income 204,123   199,173   370,910 350,549
Total investment income 22,553   19,600   44,672 39,136
Other income 1,401   1,974   2,821 5,808
Income tax expense 47,783   46,062   87,635 82,391
Net income 180,294 $ 150,474 174,685 $ 138,417 $ 330,768 $ 313,102
Erie Insurance Exchange            
Segment Reporting [Line Items]            
Depreciation and amortization expense reimbursed from the Exchange and its insurance subsidiaries (as a percent)         33.00% 29.00%
Management Operations            
Segment Reporting [Line Items]            
Total operating revenue 1,089,796   1,060,097   $ 2,101,707 $ 2,049,496
Commissions 508,097   463,442   972,953 900,302
Personnel costs 88,809   85,789   180,872 175,778
Sales and advertising 8,061   9,729   12,966 16,681
Acquisition and underwriting support costs 23,968   27,838   48,092 53,841
Technology infrastructure costs 25,086   24,311   50,889 50,382
Professional fees 19,191   24,192   38,512 50,468
Administrative and other 10,907   12,979   24,863 28,578
Total operating expenses 885,673   860,924   1,730,797 1,698,947
Operating income 204,123   199,173   370,910 350,549
Total investment income 22,553   19,600   44,672 39,136
Other income 1,401   1,974   2,821 5,808
Income tax expense 47,783   46,062   87,635 82,391
Net income 180,294   174,685   330,768 313,102
Depreciation and amortization expense 20,800   16,100   40,800 31,900
Management fee revenue | Management Operations            
Segment Reporting [Line Items]            
Total operating revenue 882,498   842,149   1,688,372 1,614,843
Administrative services reimbursement revenue            
Segment Reporting [Line Items]            
Total operating revenue 201,554   212,644   401,650 422,917
Total operating expenses 201,554   212,644   401,650 422,917
Administrative services reimbursement revenue | Management Operations            
Segment Reporting [Line Items]            
Total operating revenue 201,554   212,644   401,650 422,917
Total operating expenses 201,554   212,644   401,650 422,917
Service agreement revenue            
Segment Reporting [Line Items]            
Total operating revenue 5,744   5,304   11,685 11,736
Service agreement revenue | Management Operations            
Segment Reporting [Line Items]            
Total operating revenue 5,744   5,304   11,685 11,736
Cost of operations - policy issuance and renewal services            
Segment Reporting [Line Items]            
Total operating revenue 862,879   823,853   1,649,278 1,578,902
Total operating expenses 684,119   648,280   1,329,147 1,276,030
Cost of operations - policy issuance and renewal services | Management Operations            
Segment Reporting [Line Items]            
Total operating expenses $ 684,119   $ 648,280   $ 1,329,147 $ 1,276,030