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EMPLOYEE BENEFIT PLANS, Noncontributory Defined Benefit Pension Plan Fair Value of Plan Assets (Details) - Pension Plan [Member] - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | $ 13,247,000 | $ 13,277,000 | $ 18,212,000
Allocation | 100.00% | 100.00% |
Expected employer contribution to pension plan | $ 0 |  |
Expected future benefit payments [Abstract] |  |  |
2021 | 1,048,000 |  |
2022 | 570,000 |  |
2023 | 639,000 |  |
2024 | 809,000 |  |
2025 | 1,199,000 |  |
2026 - 2030 | 5,146,000 |  |
Level I [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | 10,575,000 | $ 10,183,000 |
Level II [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | 2,672,000 | 3,094,000 |
Level III [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | 0 | 0 |
Cash and Cash Equivalents [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | $ 456,000 | $ 924,000 |
Allocation | 3.40% | 7.00% |
Cash and Cash Equivalents [Member] | Level I [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | $ 456,000 | $ 924,000 |
Cash and Cash Equivalents [Member] | Level II [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | 0 | 0 |
Cash and Cash Equivalents [Member] | Level III [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | 0 | 0 |
Equity Securities [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | $ 5,709,000 | $ 5,084,000 |
Allocation | 43.10% | 38.30% |
Equity Securities [Member] | Minimum [Member] |  |  |
Target Allocations of Assets [Abstract] |  |  |
Target plan asset allocations | 50.00% |  |
Equity Securities [Member] | Maximum [Member] |  |  |
Target Allocations of Assets [Abstract] |  |  |
Target plan asset allocations | 70.00% |  |
Equity Securities [Member] | Level I [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | $ 5,709,000 | $ 5,084,000 |
Equity Securities [Member] | Level II [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | 0 | 0 |
Equity Securities [Member] | Level III [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | 0 | 0 |
Mutual Funds and ETF's [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | $ 4,410,000 | $ 4,175,000 |
Allocation | 33.30% | 31.40% |
Mutual Funds and ETF's [Member] | Level I [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | $ 4,410,000 | $ 4,175,000 |
Mutual Funds and ETF's [Member] | Level II [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | 0 | 0 |
Mutual Funds and ETF's [Member] | Level III [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | 0 | 0 |
Corporate Bonds [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | $ 2,672,000 | $ 3,094,000 |
Allocation | 20.20% | 23.30% |
Corporate Bonds [Member] | Minimum [Member] |  |  |
Target Allocations of Assets [Abstract] |  |  |
Target plan asset allocations | 30.00% |  |
Corporate Bonds [Member] | Maximum [Member] |  |  |
Target Allocations of Assets [Abstract] |  |  |
Target plan asset allocations | 50.00% |  |
Corporate Bonds [Member] | Level I [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | $ 0 | $ 0 |
Corporate Bonds [Member] | Level II [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | 2,672,000 | 3,094,000 |
Corporate Bonds [Member] | Level III [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | 0 | 0 |
Common Stock [Member] |  |  |
Plan assets at fair value [Abstract] |  |  |
Fair value of plan assets | $ 627,000 | $ 681,000 |
Allocation | 4.70% | 5.10% |

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