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EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Profit Sharing and Deferred Compensation Plans (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
shares
Jul. 01, 2020
USD ($)
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Defined Contribution Plan Disclosure [Line Items]        
Matching contributions     $ 1,299,000 $ 1,050,000
Employee Stock Ownership Plan (ESOP), Diversification Feature, Age Requirement     55  
Deferred Compensation Arrangement with Individual, Requisite Service Period     10 years  
Employee Stock Ownership Plan (ESOP), Diversification Feature Percentage     50.00%  
Employee Stock Ownership Plan (ESOP), Policy Diversification Feature Term     6 years  
Employee Stock Ownership Plan (ESOP), Shares Repurchased | shares     0 0
Employee Stock Ownership Plan (ESOP), Shares in ESOP, Total | shares 481,478   513,494 481,478
Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP     $ 1,040,000 $ 912,000
Deferred Compensation, Monthly Payments To Be Made To Executives Or His Heirs   $ 1,000,000    
Deferred Compensation Arrangement with Individual, Maximum Contractual Term   10 years    
Deferred Compensation Arrangement with Individual, Recorded Liability   $ 499,000    
Deferred Compensation Liability Discount Rate 1.50% 1.50%    
Deferred Compensation Liability, Current and Noncurrent $ 865,000   878,000 865,000
Merger Related Expenses        
Defined Contribution Plan Disclosure [Line Items]        
Deferred Compensation Arrangement with Individual, Compensation Expense   $ 360,000    
Pension And Other Employee Benefits Expenses        
Defined Contribution Plan Disclosure [Line Items]        
Deferred Compensation Arrangement with Individual, Compensation Expense     13,000 6,000
Officers Nonqualified Deferred Compensation Arrangement [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Deferred Compensation Arrangement with Individual, Compensation Expense     $ 314,000 $ 286,000