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STOCK-BASED COMPENSATION PLAN Nonvested Restricted Stock Awards and Fair Value Assumptions (Details)
3 Months Ended
Mar. 31, 2020
$ / shares
shares
2018 - TSR | Officers & Key Employees  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares outstanding (in shares) | shares 49,014
Weighted average fair value nonvested shares - ending balance (in dollars per share) | $ / shares $ 31.05
Expected Volatility 21.90%
Risk-Free Interest Rate 2.00%
2018 - CEGR, Time | Officers & Key Employees  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares outstanding (in shares) | shares 64,430
Weighted average fair value nonvested shares - ending balance (in dollars per share) | $ / shares $ 31.23
2019 - TSR | Officers & Key Employees  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares outstanding (in shares) | shares 36,642
Weighted average fair value nonvested shares - ending balance (in dollars per share) | $ / shares $ 32.88
Expected Volatility 23.20%
Risk-Free Interest Rate 2.40%
2019 - CEGR, Time | Officers & Key Employees  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares outstanding (in shares) | shares 104,712
Weighted average fair value nonvested shares - ending balance (in dollars per share) | $ / shares $ 31.38
2020 | Directors  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares outstanding (in shares) | shares 36,829
Weighted average fair value nonvested shares - ending balance (in dollars per share) | $ / shares $ 32.42