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EMPLOYEE BENEFITS - Narrative (Details)
 3 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2023
USD ($)
executive_officer
retiree
shares
Dec. 31, 2022
USD ($)
retiree
shares
Dec. 31, 2021
USD ($)
retiree
shares
Dec. 31, 2018
executive_officer
Dec. 31, 2013
executive_officer
Health Insurance Coverage [Abstract]              
Cost of health care benefits     $ 8,100,000 $ 8,400,000 $ 8,600,000    
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     366,791 345,847      
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     $ 2,200,000 $ 2,000,000 $ 2,200,000    
Defined Benefit Plan [Abstract]              
Adjustment To Pension Liability     $ 948,000 $ 5,400,000      
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        
Discount rate     5.13% 5.46%      
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% 6.13% 6.13% 6.13%    
Funded (under funded) status     $ 8,386,000 $ 6,866,000 $ 3,269,000    
Accrued benefit (liability) asset recognized     8,386,000 $ 6,866,000 $ 3,269,000    
Expected future employer contributions, next fiscal year     $ 0        
Retirement Plan Acquired              
Defined Benefit Plan [Abstract]              
Discount rate     5.13% 5.46%      
Expected long-term rate of return on plan assets 6.125% 6.50% 6.13% 6.13% 6.13%    
Funded (under funded) status     $ 839,000 $ 749,000 $ 388,000    
Accrued benefit (liability) asset recognized     839,000 $ 749,000 388,000    
Expected future employer contributions, next fiscal year     $ 0        
Restoration Plan              
Defined Benefit Plan [Abstract]              
Discount rate     5.13% 5.46%      
Funded (under funded) status     $ (16,176,000) $ (15,463,000) (19,321,000)    
Accrued benefit (liability) asset recognized     (16,176,000) $ (15,463,000) $ (19,321,000)    
Expected future employer contributions, next fiscal year     $ 725,000        
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     197,943 225,928      
Performance Based Restricted Stock Units              
Share-based Payment Arrangement, Noncash Expense [Abstract]              
Nonvested awards outstanding (in shares) | shares     28,654 13,514      
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     1,033,423        
Incentive Plan              
Share-based Payment Arrangement, Noncash Expense [Abstract]              
Nonvested awards outstanding (in shares) | shares     201,315 277,600 368,447    
Unrecognized compensation expense     $ 5,700,000 $ 7,400,000 $ 6,200,000    
Unrecognized compensation, weighted-average period for recognition     2 years 3 months 18 days        
Incentive Plan | Stock options              
Share-based Payment Arrangement, Noncash Expense [Abstract]              
Weighted-average remaining contractual life of options exercisable     4 years 3 months 18 days        
Awards contractual term     10 years        
Total intrinsic value of outstanding stock options     $ 453,000        
Total intrinsic value of exercisable stock options     $ 453,000        
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     $ 10,100,000        
Deferred Compensation Arrangement with Individual, Maximum Contractual Term     15 years        
Number of individuals receiving payments | executive_officer     11        
Deferred compensation expense     $ 86,000 310,000 457,000    
Total deferred compensation plan liability     $ 3,200,000 3,500,000      
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     7        
Aggregate death benefits for remaining executives, inflation adjusted     $ 5,800,000        
Expense of Split Dollar Retirement Bonus     (95,000) 27,000 87,000    
Total split dollar liability     $ 1,600,000 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     $ 3,200,000 2,900,000 2,700,000    
Tax benefit from share-based compensation expense     671,000 605,000 570,000    
Director | Incentive Plan              
Share-based Payment Arrangement, Noncash Expense [Abstract]              
Share-based compensation expense     359,000 342,000 306,000    
Tax benefit from share-based compensation expense     $ 75,000 $ 72,000 $ 64,000    
Director | Incentive Plan | Restricted Stock Units (RSUs)              
Share-based Payment Arrangement, Noncash Expense [Abstract]              
Awards vesting period     1 year