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EMPLOYEE BENEFITS - Narrative (Details)
 3 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
USD ($)
Mar. 31, 2020
Dec. 31, 2022
USD ($)
executive_officer
retiree
shares
Dec. 31, 2021
USD ($)
retiree
shares
Dec. 31, 2020
USD ($)
retiree
shares
Dec. 31, 2018
executive_officer
Dec. 31, 2013
executive_officer
Jun. 29, 2020
Health Insurance Coverage [Abstract]                    
Cost of health care benefits         $ 8,400,000 $ 8,600,000 $ 7,000,000      
Health coverage eligibility for retiring employees, minimum years of service         50 years          
Retirees participating in health insurance | retiree         1 1 1      
Employee Stock Ownership Plan (ESOP) [Abstract]                    
Contributions to the employee stock ownership plan (ESOP)         $ 1,000,000 $ 1,000,000 $ 1,000,000      
Shares owned by the ESOP (in shares) | shares         345,847 327,977        
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          
401(k) [Abstract]                    
Requisite service period         30 days          
401(k) Plan expense         $ 2,000,000 $ 2,200,000 1,900,000      
Defined Benefit Plan [Abstract]                    
Retirement plan curtailment expense         0 0 163,000      
Decrease in accumulated other comprehensive income due to freeze of future benefits and remeasurement     $ 6,000,000              
Adjustment To Pension Liability         $ 5,400,000 7,800,000        
Retirement 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          
Retirement plan curtailment expense         $ 0 $ 0 $ 151,000      
Discount rate     2.78%   5.46% 2.95%       3.41%
Number of shares of Company stock included in plan assets (in shares) | shares         240,666 240,666        
Expected long-term rate of return on plan assets 6.125% 6.50% 6.50% 7.25% 6.13% 6.13% 6.50%      
Funded (under funded) status         $ 6,866,000 $ 3,269,000 $ (6,429,000)      
Accrued benefit (liability) asset recognized         6,866,000 3,269,000 (6,429,000)      
Expected future employer contributions, next fiscal year         0          
Retirement Plan Acquired                    
Defined Benefit Plan [Abstract]                    
Retirement plan curtailment expense         $ 0 $ 0 $ 0      
Discount rate         5.46% 2.95%        
Expected long-term rate of return on plan assets 6.125% 6.50% 6.50% 7.25% 6.13% 6.13% 6.50%      
Funded (under funded) status         $ 749,000 $ 388,000 $ (91,000)      
Accrued benefit (liability) asset recognized         749,000 388,000 (91,000)      
Expected future employer contributions, next fiscal year         0          
Restoration Plan                    
Defined Benefit Plan [Abstract]                    
Retirement plan curtailment expense         $ 0 $ 0 12,000      
Discount rate     2.78%   5.46% 2.95%       3.41%
Funded (under funded) status         $ (15,463,000) $ (19,321,000) (18,789,000)      
Accrued benefit (liability) asset recognized         (15,463,000) $ (19,321,000) $ (18,789,000)      
Expected future employer contributions, next fiscal year         $ 731,000          
Equity securities | Retirement Plan                    
Defined Benefit Plan [Abstract]                    
Target allocation         64.00%          
Fixed income securities | Retirement Plan                    
Defined Benefit Plan [Abstract]                    
Target allocation         35.00%          
Cash equivalents | Retirement Plan                    
Defined Benefit Plan [Abstract]                    
Target allocation         1.00%          
Stock options                    
Share-based Payment Arrangement, Noncash Expense [Abstract]                    
Granted (shares) | shares         0 0 0      
Restricted Stock Units (RSUs)                    
Share-based Payment Arrangement, Noncash Expense [Abstract]                    
Nonvested awards outstanding (in shares) | shares         226,594 177,015        
Performance Based Restricted Stock Units                    
Share-based Payment Arrangement, Noncash Expense [Abstract]                    
Nonvested awards outstanding (in shares) | shares         8,343 0        
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         1,097,158          
Incentive Plan                    
Share-based Payment Arrangement, Noncash Expense [Abstract]                    
Nonvested awards outstanding (in shares) | shares         277,600 368,447 492,274      
Unrecognized compensation expense         $ 7,400,000 $ 6,200,000 $ 5,400,000      
Unrecognized compensation, weighted-average period for recognition         2 years 8 months 12 days          
Incentive Plan | Stock options                    
Share-based Payment Arrangement, Noncash Expense [Abstract]                    
Weighted-average remaining contractual life of options exercisable         5 years          
Awards contractual term         10 years          
Total intrinsic value of outstanding stock options         $ 1,800,000          
Total intrinsic value of exercisable stock options         $ 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          
Incentive Plan | Performance Based Restricted Stock Units                    
Share-based Payment Arrangement, Noncash Expense [Abstract]                    
Shares earned, performance period         3 years          
Performance earnings, minimum payout (as a percentage)         50.00%          
Performance earnings, target payout (as a percentage)         100.00%          
Performance earnings, maximum payout (as a percentage)         150.00%          
Executive officers                    
Deferred Compensation Arrangements [Abstract]                    
Number of employees included in the deferred compensation agreement with the Company | executive_officer         33          
Aggregate payment amount provided in the deferred compensation agreements         $ 10,400,000          
Deferred Compensation Arrangement with Individual, Maximum Contractual Term         15 years          
Number of individuals receiving payments | executive_officer         11          
Deferred compensation expense         $ 310,000 457,000 667,000      
Total deferred compensation plan liability         $ 3,500,000 3,600,000        
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         4          
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         7          
Aggregate death benefits for remaining executives, inflation adjusted         $ 5,700,000          
Expense of Split Dollar Retirement Bonus         27,000 87,000 35,000      
Total split dollar liability         $ 1,900,000 1,900,000        
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%          
Employee | Incentive Plan                    
Share-based Payment Arrangement, Noncash Expense [Abstract]                    
Share-based compensation expense         $ 2,900,000 2,700,000 2,800,000      
Tax benefit from share-based compensation expense         605,000 570,000 593,000      
Director | Incentive Plan                    
Share-based Payment Arrangement, Noncash Expense [Abstract]                    
Share-based compensation expense         342,000 306,000 196,000      
Tax benefit from share-based compensation expense         $ 72,000 $ 64,000 $ 41,000      
Director | Incentive Plan | Restricted Stock Units (RSUs)                    
Share-based Payment Arrangement, Noncash Expense [Abstract]                    
Awards vesting period         1 year