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Stock Options (Tables) | 12 Months Ended
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Dec. 31, 2020
Schedule of Black-Scholes-Merton option valuation model assumptions | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |
Expected Life (Years) |  | 7.00 | ​ | 7.00 | ​
Dividend yield |  | 6.04 | % | 2.93 | %
Interest rate |  | 0.74 | % | 1.97 | %
Volatility |  | 29.04 | % | 26.97 | %
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​
Summary of option activity under stock option plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  |  | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | average | ​ | remaining | ​ | Aggregate | ​
​ | ​ | Number of | ​ | exercise | ​ | contractual | ​ | intrinsic | ​
​ | ​ | options | ​ | price | ​ | term (years) | ​ | value ($) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (in Thousands) | ​
Options outstanding at December 31, 2019 |  | 658,588 | ​ | $ | 27.55 | ​ | ​ | ​ | ​ | ​ | ​
Plus: Options granted |  | 35,000 | ​ |  | 18.79 | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercised |  | 26,010 | ​ |  | 20.87 | ​ | ​ | ​ | ​ | ​ | ​
Options expired |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Options forfeited |  | 16,451 | ​ |  | 31.94 | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at December 31, 2020 |  | 651,127 | ​ |  | 27.24 |  | 5.05 | ​ | $ | 6,817 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options fully vested and exercisable at December 31, 2020 |  | 409,782 | ​ | $ | 22.98 |  | 3.61 | ​ | $ | 5,953 | ​
Schedule of other information pertaining to option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Twelve Months Ended December 31, |
​ | ​ | 2020 | ​ | 2019 | ​ | 2018 |
Weighted average grant date fair value of stock options granted |  | $ | 2.46 |  | $ | 7.38 |  | $ | 11.78 | ​
Total fair value of stock options vested | ​ | $ | 1,218,000 | ​ | $ | 1,333,000 | ​ | $ | 1,077,000 | ​
Total intrinsic value of stock options exercised | ​ | $ | 356,000 | ​ | $ | 2,373,000 | ​ | $ | 2,045,000 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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- Definition Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested during the year. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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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