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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, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Matching contributions |  |  | $ 1,050,000 | $ 891,000
Employee Stock Ownership Plan (ESOP), Diversification Feature, Age Requirement | 55 |  | 55 |
Deferred Compensation Arrangement with Individual, Requisite Service Period |  |  | 10 years |
Employee Stock Ownership Plan (ESOP), Diversification Feature Percentage | 50.00% |  | 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 |  | 481,478 | 473,171
Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP |  |  | $ 912,000 | $ 718,000
Deferred Compensation Arrangement with Individual, Compensation Expense |  | $ 366,000 |  |
Pension and Other Postretirement Benefits Cost (Reversal of Cost), Total |  |  | 7,463,000 | 5,837,000
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 |  | 865,000 |
Merger Related Expenses [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  | $ 360,000 |  |
Pension And Other Employee Benefits Expenses [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  | $ 6,000 |  |
Officers Nonqualified Deferred Compensation Arrangement [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  |  | $ 286,000 | $ 251,000

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- Definition The amount of monthly deferred compensation payable to the executives or his heirs under the arrangement. + References No definition available. + Details
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- Definition The age a participant in an Employee Stock Ownership Plan must be in order to be eligible for the plans diversification feature. + References No definition available. + Details
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- Definition The maximum amount of Corporation shares that a participant in an Employee Stock Ownership Plan is allowed to sell back in a predetermined amount of time once qualifications for the plans diversification feature have been met. + References No definition available. + Details
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