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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of granted stock options, Black-Scholes option-pricing model assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31, |
​ | ​ | ​ | 2020 |  | 2019 | ​ | 2018 |
Dividend yield | ​ | ​ | ​ | 3.03 | % | ​ | 2.86 | % | ​ | 2.80 | %
Expected volatility | ​ | ​ | ​ | 23.11 | ​ | ​ | 23.80 | ​ | ​ | 27.53 | ​
Risk-free interest rate | ​ | ​ | ​ | 1.47 | ​ | ​ | 2.52 | ​ | ​ | 2.67 | ​
Expected option life | ​ | ​ | ​ | 6.0 | years | ​ | 6.0 | years | ​ | 6.5 | years
Schedule of company's stock options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​ | ​
​ | ​ | Number | ​ | Average | ​ | Remaining | ​ | ​ | Aggregate
​ | ​ | of | ​ | Exercise | ​ | Contractual | ​ | ​ | Intrinsic
(Dollars in thousands, except per share amounts) |  | Options |  | Price |  | Life |  |  | Value
Outstanding, January 1, 2020 | ​ | 110,660 |  | $ | 35.71 | ​ | ​ | ​ | ​ | ​ | ​ | ​
Granted | ​ | 69,360 | ​ | ​ | 34.87 | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding, December 31, 2020 | ​ | 180,020 |  | ​ | 35.39 | ​ |  | 8.2 | years | ​ | $ | —
Vested and Exercisable, December 31, 2020 | ​ | 110,660 |  | ​ | 35.71 |  | ​ | 7.7 | years | ​ | ​ | —
​
​ | ​ | ​ | ​
Number of | ​ | Exercise
Options |  | Price
69,360 | ​ | $ | 34.87
63,267 | ​ | ​ | 35.35
47,393 | ​ | ​ | 36.19
180,020 | ​ | ​ | ​
Restricted stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of status of unvested restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average Grant-Date
​ |  | Shares |  | Fair Value
Unvested, January 1, 2020 |  | 293,717 | ​ | $ | 30.37
Granted |  | 91,428 | ​ | ​ | 31.02
Vested |  | (289,509) | ​ | ​ | 30.34
Forfeited |  | (6,593) | ​ | ​ | 32.16
Unvested, December 31, 2020 |  | 89,043 | ​ | ​ | 31.00
Restricted stock units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of status of unvested restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average Grant-Date
​ |  | Shares |  | Fair Value
Unvested, January 1, 2020 | ​ | 85,342 |  | $ | 29.59
Granted | ​ | 26,556 | ​ | ​ | 32.13
Reinvested dividends | ​ | 4,491 | ​ | ​ | 30.08
Added by performance factor | ​ | 605 | ​ | ​ | 33.69
Forfeited | ​ | (6,623) | ​ | ​ | 28.68
Vested | ​ | (72,096) | ​ | ​ | 29.10
Unvested, December 31, 2020 | ​ | 38,275 |  | ​ | 32.57

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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