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EMPLOYEE BENEFITS - Narrative (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
executive_officer
Rate
shares
Dec. 31, 2018
USD ($)
executive_officer
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2013
executive_officer
Health Insurance Coverage [Abstract]        
Cost of health care benefits $ 7,900,000 $ 6,500,000 $ 5,600,000  
Health coverage eligibility for retiring employees, minimum years of service 50 years      
Retirees participating in health insurance 1 1 2  
Employee Stock Ownership Plan (ESOP) [Abstract]        
Contributions to the employee stock ownership plan (ESOP) $ 700,000 $ 700,000 $ 350,000  
Shares owned by the ESOP (in shares) | shares 283,097 277,492    
Supplemental Unemployment Benefits [Abstract]        
Long-term disability coverage, minimum years of service rendered for officers to automatically qualify 3 years      
Long-term disability coverage, minimum annual salary level for officers to automatically qualify $ 50,000      
Long-term disability coverage, maximum benefit provided, per month $ 15,000      
Long-term disability coverage, maximum benefit provided, as a ratio of final salary | Rate 66.66667%      
401(k) [Abstract]        
Requisite service period 30 days      
401(k) Plan expense $ 1,600,000 $ 1,500,000 613,000  
Defined Benefit Plan [Abstract]        
Non-cash adjustment to pension plan liabilities, consisting of changes in prior service cost and net loss $ 7,400,000      
Defined Benefit Pension Plan        
Defined Benefit Plan [Abstract]        
Defined benefit pension plan, minimum eligibility age 65 years      
Early retirement election at reduced benefit levels, minimum eligibility age 55 years      
Number of shares of Company stock included in plan assets (in shares) | shares 240,666 240,666    
Funded (under funded) status $ (6,194,000) $ (1,081,000) (3,043,000)  
Accrued benefit (liability) asset recognized (6,194,000) (1,081,000) (3,043,000)  
Expected future employer contributions, next fiscal year 0      
Defined Benefit Pension Plan Acquired        
Defined Benefit Plan [Abstract]        
Funded (under funded) status (107,000) 197,000 (361,000)  
Accrued benefit (liability) asset recognized (107,000) 197,000 (361,000)  
Expected future employer contributions, next fiscal year 0      
Restoration Plan        
Defined Benefit Plan [Abstract]        
Funded (under funded) status (19,098,000) (15,300,000) (14,642,000)  
Accrued benefit (liability) asset recognized (19,098,000) $ (15,300,000) $ (14,642,000)  
Expected future employer contributions, next fiscal year $ 0      
Equity securities | Defined Benefit Pension Plan        
Defined Benefit Plan [Abstract]        
Target allocation 55.00%      
Fixed income securities | Defined Benefit Pension Plan        
Defined Benefit Plan [Abstract]        
Target allocation 44.50%      
Cash equivalents | Defined Benefit Pension Plan        
Defined Benefit Plan [Abstract]        
Target allocation 0.50%      
Restricted Stock Units (RSUs)        
Share-based Payment Arrangement, Noncash Expense [Abstract]        
Nonvested awards outstanding (in shares) | shares 143,291 109,750    
Incentive Plan 2009        
Share-based Payment Arrangement, Noncash Expense [Abstract]        
Number of additional shares (in shares) | shares 410,000      
Incentive Plan 2017        
Share-based Payment Arrangement, Noncash Expense [Abstract]        
Common stock shares reserved and available for issuance (in shares) | shares 2,460,000      
Shares remaining available for grant for future awards (in shares) | shares 1,307,964      
Incentive Plan        
Share-based Payment Arrangement, Noncash Expense [Abstract]        
Nonvested awards outstanding (in shares) | shares 737,434 612,740 366,292  
Share-based compensation expense $ 2,400,000 $ 2,300,000 $ 1,800,000  
Tax benefit from share-based compensation expense 501,000 487,000 635,000  
Unrecognized compensation expense $ 7,700,000 5,800,000 3,800,000  
Unrecognized compensation, weighted-average period for recognition 2 years 11 months 19 days      
Incentive Plan | Stock options        
Share-based Payment Arrangement, Noncash Expense [Abstract]        
Total intrinsic value of outstanding stock options $ 6,200,000      
Total intrinsic value of exercisable stock options $ 4,700,000      
Weighted-average remaining contractual life of options exercisable 5 years 4 months 17 days      
Awards contractual term 10 years      
Total intrinsic value of stock options exercised during period $ 1,100,000 1,400,000 1,800,000  
Incentive Plan | Stock options | Minimum        
Share-based Payment Arrangement, Noncash Expense [Abstract]        
Awards vesting period 3 years      
Incentive Plan | Stock options | Maximum        
Share-based Payment Arrangement, Noncash Expense [Abstract]        
Awards vesting period 4 years      
Incentive Plan | Restricted Stock Units (RSUs) | Minimum        
Share-based Payment Arrangement, Noncash Expense [Abstract]        
Awards vesting period 3 years      
Incentive Plan | Restricted Stock Units (RSUs) | Maximum        
Share-based Payment Arrangement, Noncash Expense [Abstract]        
Awards vesting period 4 years      
Executive officers        
Deferred Compensation Arrangements [Abstract]        
Number of employees included in the deferred compensation agreement with the Company | executive_officer 23      
Aggregate payment amount provided in the deferred compensation agreements $ 8,400,000      
Maximum benefit period after retirement or death 15 years      
Number of individuals receiving payments | executive_officer 10      
Deferred compensation expense $ 173,000 201,000 353,000  
Total deferred compensation plan liability $ 3,200,000 $ 3,400,000    
Split Dollar Life Insurance Agreements [Abstract]        
Number of employees originally covered by the split dollar agreements | executive_officer 8      
Aggregate death benefit amount provided originally in agreement, before inflation adjustment $ 4,500,000      
Number of employees covered by the split dollar agreements, Actively employed with us | executive_officer 3      
Number of retired covered officers death benefits were paid | executive_officer   1    
Number of active covered officers death benefits were paid | executive_officer       1
Number of remaining employees covered by the split dollar agreements | executive_officer 6      
Aggregate death benefits for remaining six executives, inflation adjusted $ 4,500,000      
Expense of split dollar retirement bonus 12,000 $ 250,000 $ 3,000  
Total split dollar liability $ 1,300,000 $ 1,400,000    
Executive officers | Minimum        
Split Dollar Life Insurance Agreements [Abstract]        
Inflation adjustment factor applied to benefits, annual 3.00%      
Executive officers | Maximum        
Split Dollar Life Insurance Agreements [Abstract]        
Inflation adjustment factor applied to benefits, annual 5.00%