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Stock Options (Tables) | 12 Months Ended
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Dec. 31, 2019
Schedule of Black-Scholes-Merton option valuation model assumptions | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |
Expected Life (Years) |  | 7.00 | ​ | 7.00 | ​
Dividend yield |  | 2.93 | % | 1.73 | %
Interest rate |  | 1.97 | % | 2.68 | %
Volatility |  | 26.97 | % | 31.65 | %
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​
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, 2018 |  | 788,977 | ​ | $ | 25.91 | ​ | ​ | ​ | ​ | ​ | ​
Plus: Options granted |  | 16,500 | ​ |  | 35.34 | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercised |  | 110,938 | ​ |  | 17.29 | ​ | ​ | ​ | ​ | ​ | ​
Options expired |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Options forfeited |  | 35,951 | ​ |  | 26.74 | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at December 31, 2019 |  | 658,588 | ​ |  | 27.55 |  | 5.76 | ​ | $ | 10,219 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options fully vested and exercisable at December 31, 2019 |  | 319,085 | ​ | $ | 22.14 |  | 4.38 | ​ | $ | 6,680 | ​
Schedule of other information pertaining to option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Twelve Months Ended December 31, |
​ | ​ | 2019 | ​ | 2018 | ​ | 2017 |
Weighted average grant date fair value of stock options granted |  | $ | 7.38 |  | $ | 11.78 |  | $ | — | ​
Total fair value of stock options vested | ​ | $ | 1,333,000 | ​ | $ | 1,077,000 | ​ | $ | 1,182,000 | ​
Total intrinsic value of stock options exercised | ​ | $ | 2,373,000 | ​ | $ | 2,045,000 | ​ | $ | 2,595,000 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) No stock options were granted during the twelve months ended December 31, 2017. | ​

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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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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