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Incentive and Deferred Compensation Plans (Details) - USD ($)
1 Months Ended 2 Months Ended 12 Months Ended
Jun. 30, 2016
Nov. 30, 2015
Jun. 30, 2015
Dec. 17, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Class A              
Incentive and deferred compensation plans              
Total cost of shares purchased outside of publicly announced stock repurchase program         $ 1,500,000 $ 10,400,000  
Class A | Performance shares              
Incentive and deferred compensation plans              
Shares purchased outside of publicly announced stock repurchase program for share-based compensation awards (in shares)         15,093 111,535  
Long-term incentive plan              
Incentive and deferred compensation plans              
Vesting period of performance and/or service condition(s) (in years and/or months)         3 years    
Maximum dollar amount which may be received by any single participant during any specified period         $ 5,000,000    
Compensation cost related to share-based compensation plan awards         8,200,000 $ 13,400,000 $ 12,500,000
Tax benefits recognized in income related to award expense         2,900,000 4,700,000 4,400,000
Total unrecognized compensation cost related to share-based compensation plan awards pertaining to open performance periods         $ 7,300,000    
Expected period of recognition related to unrecognized compensation cost (in years)         2 years    
Long-term incentive plan | Class A              
Incentive and deferred compensation plans              
Maximum number of shares authorized for grant (in shares)         1,500,000    
Maximum number of shares which may be received by any single participant during any specified period (in shares)         250,000    
Average price per share for shares purchased (in dollars per share) $ 98.20   $ 81.91        
Total cost of shares purchased outside of publicly announced stock repurchase program $ 800,000   $ 100,000        
Long-term incentive plan | Class A | Performance shares              
Incentive and deferred compensation plans              
Shares purchased outside of publicly announced stock repurchase program for share-based compensation awards (in shares) 7,661   1,567        
Long-term incentive plan | 2014-2016 performance period              
Incentive and deferred compensation plans              
Compensation cost related to share-based compensation plan awards         $ 12,500,000    
Long-term incentive plan | 2013-2015 performance period              
Incentive and deferred compensation plans              
Compensation cost related to share-based compensation plan awards $ 12,600,000            
Long-term incentive plan | 2013-2015 performance period | Class A              
Incentive and deferred compensation plans              
Compensation cost related to share-based compensation plan awards $ 700,000            
Average price per share for shares delivered (in dollars per share) $ 96.64            
Long-term incentive plan | 2013-2015 performance period | Class A | Performance shares              
Incentive and deferred compensation plans              
Shares purchased outside of publicly announced stock repurchase program for share-based compensation awards (in shares) 7,661            
Long-term incentive plan | 2012-2014 performance period              
Incentive and deferred compensation plans              
Compensation cost related to share-based compensation plan awards     $ 8,200,000        
Long-term incentive plan | 2012-2014 performance period | Class A              
Incentive and deferred compensation plans              
Compensation cost related to share-based compensation plan awards     $ 100,000        
Average price per share for shares delivered (in dollars per share)     $ 81.04        
Long-term incentive plan | 2012-2014 performance period | Class A | Performance shares              
Incentive and deferred compensation plans              
Shares purchased outside of publicly announced stock repurchase program for share-based compensation awards (in shares)     1,567        
Equity compensation plan              
Incentive and deferred compensation plans              
Compensation cost related to share-based compensation plan awards         800,000 $ 400,000 $ 300,000
Total unrecognized compensation cost related to share-based compensation plan awards pertaining to open performance periods         $ 700,000    
Expected period of recognition related to unrecognized compensation cost (in years)         3 years    
Equity compensation plan | Class A              
Incentive and deferred compensation plans              
Maximum number of shares authorized for grant (in shares)         100,000    
Maximum number of shares which may be received by any single participant during any specified period (in shares)         5,000    
Restricted stock units granted         4,500 5,500 8,750
Incentive compensation deferral plan              
Incentive and deferred compensation plans              
Maximum annual incentive plan and/or long-term incentive plan award that can be deferred (as a percent)         100.00%    
Vesting percent of the grant in Class A common stock (as a percent)         100.00%    
Payment period for vested share credits (in years)         3 years    
Stock compensation plan for outside directors              
Incentive and deferred compensation plans              
Compensation cost related to share-based compensation plan awards         $ 500,000 $ 1,900,000 $ 2,200,000
Stock compensation plan for outside directors | Class A              
Incentive and deferred compensation plans              
Average price per share for shares purchased (in dollars per share)   $ 87.03   $ 94.99 $ 99.23    
Total cost of shares purchased outside of publicly announced stock repurchase program   $ 1,100,000   $ 9,000,000 $ 700,000    
Stock compensation plan for outside directors | Class A | Performance shares              
Incentive and deferred compensation plans              
Shares purchased outside of publicly announced stock repurchase program for share-based compensation awards (in shares)   12,230   94,938 7,432    
Stock compensation plan for outside directors | Three month vesting period | Class A              
Incentive and deferred compensation plans              
Vesting period of performance and/or service condition(s) (in years and/or months)         3 months    
Vesting percent of the grant in Class A common stock (as a percent)         25.00%    
Erie Insurance Exchange (EIE) | Long-term incentive plan              
Incentive and deferred compensation plans              
Incentive plan compensation cost reimbursed to Indemnity from the Exchange (as a percent)         44.00%    
Erie Insurance Exchange (EIE) | Equity compensation plan              
Incentive and deferred compensation plans              
Incentive plan compensation cost reimbursed to Indemnity from the Exchange (as a percent)         30.00%