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STOCK-BASED COMPENSATION (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Plan
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock option plans | Plan 2    
Stock repurchased and retired during period, shares 67,974 17,300  
Average cost per share of stock repurchased | $ / shares $ 27.34 $ 22.14  
Recognized compensation expense | $ $ 801 $ 788 $ 500
Recognized compensation expense, net of tax | $ 521 512 325
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost associated with restricted stock awards, not currently vested | $ $ 640    
Weighted-average period over which the compensation expense is expected to be recognized 1 year 6 months 21 days    
Total fair value of restricted stock awards that vested | $ $ 545 $ 414 $ 233
Non-vested restricted stock awards activity in shares      
Non-vested, beginning of year (in shares) 234,281 216,944 155,864
Granted (in shares) 2,000 118,588 117,146
Vested (in shares) (85,192) (69,057) (40,941)
Forfeited (in shares) (7,039) (32,194) (15,125)
Non-vested, end of year (in shares) 144,050 234,281 216,944
Non-vested restricted stock awards activity in dollars per share weighted-average grant-date fair value      
Non-vested, beginning of year (in dollars per share) | $ / shares $ 22.31 $ 20.40 $ 19.21
Granted (in dollars per share) | $ / shares 26.95 24.56 21.36
Vested (in dollars per share) | $ / shares 21.31 19.98 18.99
Forfeited (in dollars per share) | $ / shares 22.57 22.73 19.35
Non-vested, end of year (in dollars per share) | $ / shares $ 22.96 $ 22.31 $ 20.40
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based arrangements, liability, current and noncurrent | $ $ 543    
Non-vested restricted stock awards activity in shares      
Non-vested, beginning of year (in shares) 0    
Granted (in shares) 116,288    
Vested (in shares) 0    
Forfeited (in shares) 2,233    
Non-vested, end of year (in shares) 114,055 0  
Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years 5 years 5 years
Total intrinsic value of options exercised under Employers Mutual's stock option plans | $ $ 901 $ 1,100 $ 770
Portion of the current tax deduction realized from exercises of stock options | $ $ 239 $ 284 $ 121
Number of options [Roll Forward]      
Outstanding, beginning of year (in shares) 649,012 1,006,171 1,351,802
Exercised (in shares) (222,921) (321,312) (323,486)
Expired (in shares) (18,805) (34,947) (20,850)
Forfeited (in shares) (975) (900) (1,295)
Outstanding, end of year (in shares) 406,311 649,012 1,006,171
Options Exercisable, end of year (in shares) 406,311 593,224 824,365
Weighted-average exercise price [Roll Forward]      
Outstanding, beginning of year (in dollars per share) | $ / shares $ 14.65 $ 14.92 $ 14.89
Exercised (in dollars per share) | $ / shares 14.88 15.31 14.86
Expired (in dollars per share) | $ / shares 15.16 16.32 14.11
Forfeited (in dollars per share) | $ / shares 13.99 13.99 14.68
Outstanding, end of year (in dollars per share) | $ / shares 14.51 14.65 14.92
Exercisable, end of year (in dollars per share) | $ / shares $ 14.51 $ 14.72 $ 14.95
Additional information relating to options outstanding and options vested (exercisable) [Abstract]      
Options outstanding, Number of options (in shares) 406,311    
Options outstanding, Weighted-average exercise price (in dollars per share) | $ / shares $ 14.51    
Options outstanding, Aggregate intrinsic value | $ $ 5,910    
Options outstanding, Weighted-average remaining term 2 years 9 months 21 days    
Options exercisable, Number of options (in shares) 406,311    
Options exercisable, Weighted-average exercise price (in dollars per share) | $ / shares $ 14.51    
Options exercisable, Aggregate intrinsic value | $ $ 5,910    
Options exercisable, Weighted-average remaining term 2 years 9 months 21 days    
EMC Insurance Group Inc. 2017 Non-Employee Director Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Registered shares (in shares) 150,000    
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Registered shares (in shares) 750,000 750,000 750,000
Fair market value of the stock on the date of purchase (in hundredths) 85.00% 85.00% 85.00%
Employee stock purchase plan administrative expense | $ $ 100 $ 78 $ 59
Other Stock Purchase Plan Shares Activity [Roll Forward]      
Shares available for purchase, beginning of year (in shares) 349,404 414,883 471,459
Shares purchased under the plan (in shares) (77,819) (65,479) (56,576)
Shares available for purchase, end of year (in shares) 271,585 349,404 414,883
Other stock purchase plan stock option exercise price range lower range limit (in dollars per share) | $ / shares $ 23.64    
Other stock purchase plan stock option exercise price range upper range limit (in dollars per share) | $ / shares $ 25.15    
Non-Employee Director Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Registered shares (in shares) 300,000 300,000 300,000
Fair market value to purchase stock under Non-employee director stock option plan (in hundredths) 75.00% 75.00% 75.00%
Minimum cash retainer used to purchase common stock (in hundredths) 25.00% 25.00% 25.00%
Maximum cash retainer used to purchase common stock (in hundredths) 100.00% 100.00% 100.00%
Non employee director stock option plan administrative expense | $ $ 65 $ 84 $ 62
Other Stock Purchase Plan Shares Activity [Roll Forward]      
Shares available for purchase, beginning of year (in shares) 249,843 264,446 279,809
Shares purchased under the plan (in shares) (14,470) (14,603) (15,363)
Shares available for purchase, end of year (in shares) 235,373 249,843 264,446
Other stock purchase plan stock option exercise price range lower range limit (in dollars per share) | $ / shares $ 20.15    
Other stock purchase plan stock option exercise price range upper range limit (in dollars per share) | $ / shares $ 23.15    
Dividend Reinvestment Plan [Member]      
Other Stock Purchase Plan Shares Activity [Roll Forward]      
Shares available for purchase, beginning of year (in shares) 971,222 976,697 982,227
Shares purchased under the plan (in shares) (5,421) (5,475) (5,530)
Shares available for purchase, end of year (in shares) 965,801 971,222 976,697
Other stock purchase plan stock option exercise price range lower range limit (in dollars per share) | $ / shares $ 26.94 $ 22.09 $ 21.02
Other stock purchase plan stock option exercise price range upper range limit (in dollars per share) | $ / shares $ 31.09 $ 30.50 $ 26.43
Employers Mutual Casualty Company Stock Incentive 2007 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Registered shares (in shares) 3,000,000 3,000,000 3,000,000
Time limit for granting awards 10 years 10 years 10 years
Employers Mutual Casualty Company 2017 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Registered shares (in shares) 1,000,000    
Time limit for granting awards 10 years    
Employee [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years 4 years 4 years
Employee [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Approved retirement threshold 70    
Approved retirement minimum age 55 years    
Automatic age for approved retirement 65 years    
Accelerated period non-forfeiture upon approved retirement eligibility 12 months    
Non-Employee Director [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year 3 years  
Age to attain automatic vesting   75 years  
Non-vested restricted stock awards activity in shares      
Granted (in shares) 2,000 2,000