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EMPLOYEE BENEFIT PLANS, Restricted Stock Plan (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Additional General Disclosures [Abstract] |  |  |
Share-based compensation expense | $ 473,000 | $ 369,000 | $ 308,000
Restricted Stock [Member] |  |  |
Deferred Compensation Arrangements [Abstract] |  |  |
Number of shares authorized (in shares) | 150,000 |  |
Number of shares available for grant (in shares) | 124,051 |  |
Unvested Shares [Roll Forward] |  |  |
Outstanding, beginning of year (in shares) | 10,877 |  |
Granted (in shares) | 5,160 |  |
Forfeited (in shares) | (337) |  |
Vested (in shares) | (5,498) |  |
Outstanding, end of year (in shares) | 10,202 | 10,877 |
Weighted Average Market Price [Roll Forward] |  |  |
Outstanding, beginning of year (in dollars per share) | $ 60.11 |  |
Granted (in dollars per share) | 50.89 | $ 60.02 | $ 62.74
Forfeited (in dollars per share) | 57.43 |  |
Vested (in dollars per share) | 59.37 |  |
Outstanding, end of year (in dollars per share) | $ 55.93 | $ 60.11 |
Additional General Disclosures [Abstract] |  |  |
Share-based compensation expense | $ 333,000 | $ 299,000 | $ 256,000
Compensation cost related to nonvested awards that has not yet recognized | $ 571,000 |  |
Period over which compensation cost is expected to be recognized | 3 years |  |

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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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