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STOCK PLANS AND STOCK BASED COMPENSATION - ACTIVITY (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Information related to the stock option plan |  |  |
Total cash received from options exercised, net of shares redeemed | $ (2,000) | $ 52,000 | $ (142,000)
Information related to stock option and restricted stock awards granted |  |  |
Expenses | 1,322,000 | $ 1,649,000 | $ 1,441,000
Estimated unrecognized stock option and restricted stock award expense related to unvested options and awards (net of estimated forfeitures) |  |  |
2024 | 1,541,000 |  |
2025 | 1,107,000 |  |
2026 | 557,000 |  |
2027 | 13,000 |  |
Total | $ 3,218,000 |  |
Employee Stock Option [Member] |  |  |
Weighted average assumptions used to determined fair value of stock options granted |  |  |
Risk-free interest rate (as a percent) | 3.86% | 1.35% | 0.20%
Expected dividend yield (as a percent) | 3.19% | 2.50% | 3.18%
Expected stock price volatility (as a percent) | 33.14% | 32.12% | 31.71%
Expected life of options (in years) | 4 years | 4 years | 4 years
Estimated fair value per share of options granted (in dollars per share) | $ 9.65 | $ 10.41 | $ 6.26
Options |  |  |
Outstanding, beginning of year (in shares) | 465,033 | 460,502 |
Granted (in shares) | 69,617 | 54,281 |
Exercised (in shares) | (10,000) | (5,250) |
Forfeited or expired (in shares) | (64,000) | (44,500) |
Outstanding, end of year (in shares) | 460,650 | 465,033 | 460,502
Unvested (in shares) | 287,148 |  |
Exercisable (vested) at end of year (in shares) | 173,502 |  |
Weighted Average Exercise Price |  |  |
Outstanding, beginning of year (in dollars per share) | $ 38.81 | $ 37.54 |
Granted (in dollars per share) | 42.74 | 50.34 |
Exercised (in dollars per share) | 46.08 | 34.17 |
Forfeited or expired (in dollars per share) | 45.09 | 40.32 |
Outstanding, end of year (in dollars per share) | 38.37 | $ 38.81 | $ 37.54
Unvested (in dollars per share) | 38.76 |  |
Exercisable (vested) at end of year (in dollars per share) | $ 37.72 |  |
Weighted Average Remaining Contractual Term (years) |  |  |
Outstanding, end of year | 1 year 10 months 13 days | 2 years 3 months |
Unvested | 2 years 5 months 1 day |  |
Exercisable (vested) at end of year | 11 months 15 days |  |
Aggregate Intrinsic Value |  |  |
Outstanding, end of year | $ 7,734,879 | $ 2,322,635 |
Unvested | 4,708,333 |  |
Exercisable (vested) at end of year | 3,026,546 |  |
Information related to the stock option plan |  |  |
Total intrinsic value of options exercised | 58,000 | 57,000 | $ 1,335,000
Total cash received from options exercised, net of shares redeemed | (2,000) | 52,000 | (142,000)
Total tax benefit of options exercised | 1,000 | 6,000 | 223,000
Information related to stock option and restricted stock awards granted |  |  |
Expenses | 774,000 | 560,000 | $ 574,000
Estimated unrecognized stock option and restricted stock award expense related to unvested options and awards (net of estimated forfeitures) |  |  |
2024 | 489,000 |  |
2025 | 263,000 |  |
2026 | 18,000 |  |
2027 | 5,000 |  |
Total | 775,000 |  |
Employee Stock Option [Member] | Non-executive officer employees | Related Party [Member] |  |  |
Information related to the stock option plan |  |  |
Outstanding loans | $ 129,000 | $ 178,000 |
Restricted Stock Awards |  |  |
Shares |  |  |
Outstanding, beginning of year (in shares) | 64,733 | 56,059 |
Granted (in shares) | 55,157 | 12,174 |
Forfeited (in shares) | (1,470) |  |
Earned and issued (in shares) | (31,354) | (3,500) |
Outstanding, end of year (in shares) | 87,066 | 64,733 | 56,059
Unvested and Expected to vest (in shares) | 87,066 |  |
Weighted-average grant date fair value |  |  |
Outstanding, beginning of year (in dollars per share) | $ 40.49 | $ 39.12 |
Granted (in dollars per share) | 43.60 | 46.05 |
Forfeited (in dollars per share) | 49.08 |  |
Earned and issued (in dollars per share) | 37.56 | 37.74 |
Outstanding, end of year (in dollars per share) | 43.37 | $ 40.49 | $ 39.12
Unvested and Expected to vest (in dollars per share) | $ 43.37 |  |
Other than option, Weighted-Average Remaining Contractual Term (years) |  |  |
Outstanding, end of year | 1 year 11 months 23 days | 2 years 3 months |
Information related to stock option and restricted stock awards granted |  |  |
Total fair value of shares vested | $ 1,500,000 | $ 186,000 | $ 50,000
Expenses | 829,000 | $ 937,000 | 738,000
Estimated unrecognized stock option and restricted stock award expense related to unvested options and awards (net of estimated forfeitures) |  |  |
2024 | 1,052,000 |  |
2025 | 844,000 |  |
2026 | 539,000 |  |
2027 | 8,000 |  |
Total | $ 2,443,000 |  |
Restricted Stock Awards | Minimum |  |  |
Shares |  |  |
Unrecognized compensation expense recognition period | 3 years |  |
Restricted Stock Awards | Maximum |  |  |
Shares |  |  |
Unrecognized compensation expense recognition period | 6 years |  |
Performance Stock Units |  |  |
Shares |  |  |
Granted (in shares) | 10,999 | 8,874 |
Forfeited (in shares) | (10,999) | (8,874) |
Weighted-average grant date fair value |  |  |
Granted (in dollars per share) | $ 42.74 | $ 51.39 |
Forfeited (in dollars per share) | $ 42.74 | $ 51.39 |
Information related to stock option and restricted stock awards granted |  |  |
Expenses | $ (281,000) | $ 152,000 | $ 129,000

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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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