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Share-Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2020
Share-Based Compensation Plans |
Schedule of Company's stock option activity | The following table summarizes the Company’s stock option activity for the six-month period ended June 30, 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Aggregate
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ |  | Shares |  | Price |  | Term (Years) |  | Value*
Outstanding at December 31, 2019 |  | 1,176,770 | ​ | $ | 27.14 |  |  |  | ​ |
Granted |  | — | ​ | $ | — |  |  |  | ​ |
Exercised |  | — | ​ | $ | — |  |  |  | ​ |
Forfeited or expired |  | (9,135) | ​ | $ | 28.03 |  |  |  | ​ |
Outstanding at June 30, 2020 |  | 1,167,635 | ​ | $ | 27.13 |  | 4.2 | ​ | $ | —
Exercisable at June 30, 2020 |  | 700,655 | ​ | $ | 26.70 |  | 1.9 | ​ | $ | —
* The aggregate intrinsic value of outstanding and exercisable stock options is defined as the difference between the market value of the Company's stock on June 30, 2020, the last trading day of the quarter, of $21.59 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stockoptions. The respective exercise prices of all of the Company's outstanding stock options were higher than the closing price of the Company's common stock as of June 30, 2020; therefore, the aggregate intrinsic value of the Company's stock options is zero.
Schedule of Company's stock option exercise activity | The following table summarizes the Company’s stock option exercise activity for the three and six months ended June 30, 2020 and 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019
​ | ​ | (Dollars in thousands)
Total intrinsic value of stock options exercised | ​ | $ | — | ​ | $ | 77 | ​ | $ | — | ​ | $ | 88
Net proceeds from stock option exercises | ​ | $ | — | ​ | $ | 154 | ​ | $ | — | ​ | $ | 161
Income tax benefit from the exercise of stock options | ​ | $ | — | ​ | $ | 20 | ​ | $ | — | ​ | $ | 23
Schedule of Company's restricted stock award | The following table summarizes the Company’s restricted stock award activity for the six-month period ended June 30, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​
​ | ​ | Shares of | ​ | Average | ​ | Remaining | ​ | Aggregate
​ | ​ | Restricted | ​ | Grant Date | ​ | Contractual | ​ | Intrinsic
​ |  | Stock |  | Fair Value |  | Term (Years) |  | Value*
Non-vested at December 31, 2019 |  | 68,735 | ​ | $ | 28.04 |  |  |  | ​ |
Issued |  | — | ​ | ​ | — |  |  |  | ​ |
Vested |  | — | ​ |  | — |  |  |  | ​ |
Forfeited |  | — | ​ |  | — |  |  |  | ​ |
Non-vested at June 30, 2020 |  | 68,735 | ​ | $ | 28.04 |  | 2.2 | ​ | $ | 1,484,000
* The aggregate intrinsic value of non-vested restricted stock was calculated using the market value of the Company's stock on June 30, 2020, the last trading day of the quarter, of $21.59 multiplied by the number of non-vested restricted shares outstanding.

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- Definition Tabular disclosure of cash received from exercise of stock options and similar instruments granted under share-based payment arrangements and tax benefit from exercise of stock 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 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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) -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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