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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Stock-Based Compensation [Abstract] |
Schedule of stock-based compensation expense |
|  | For the yea rs ended December 31,
(dollars in thousands) |  |  | 2018 |  | 2017 |  | 2016
Stock option expense |  | $ | 1,183 |  | 959 |  | 746
Restricted stock grant expense |  |  | 319 |  | 299 |  | 286
Total stock-based compensation expense |  | $ | 1,502 |  | 1,258 |  | 1,032
Summary of the status of the stock option plan and changes |
|  | F or the years ended December 31,
|  |  |  |  |  |  |  | 2018 |  |  |  |  |  |  |  | 2017 |  |  |  |  |  |  |  | 2016
|  |  |  |  |  |  |  | Weighted |  |  |  |  |  |  |  | Weighted |  |  |  |  |  |  |  | Weighted
|  |  |  |  | Weighted |  | Average |  |  |  |  | Weighted |  | Average |  |  |  |  | Weighted |  | Average
|  |  |  |  | average |  | Remaining |  |  |  |  | average |  | Remaining |  |  |  |  | average |  | Remaining
|  |  |  |  | exercise |  | Contractual |  |  |  |  | exercise |  | Contractual |  |  |  |  | exercise |  | Contractual
|  | Shares |  |  | price |  | Life |  | Shares |  |  | price |  | Life |  | Shares |  |  | price |  | Life
Outstanding at beginning of year |  | 662,841 |  |  | $ | 15.70 |  |  |  | 642,203 |  |  | $ | 11.77 |  |  |  | 693,954 |  |  | $ | 8.94 |  |
Granted |  | 93,200 |  |  |  | 43.32 |  |  |  | 110,950 |  |  |  | 35.34 |  |  |  | 109,500 |  |  |  | 23.65 |  |
Exercised |  | (105,630 | ) |  |  | 8.51 |  |  |  | (74,437 | ) |  |  | 9.48 |  |  |  | (152,751 | ) |  |  | 7.19 |  |
Forfeited or expired |  | (3,600 | ) |  |  | 40.03 |  |  |  | (15,875 | ) |  |  | 23.49 |  |  |  | (8,500 | ) |  |  | 15.69 |  |
Outstanding at end of year |  | 646,811 |  |  | $ | 20.71 |  | 5.6 years |  | 662,841 |  |  | $ | 15.70 |  | 5.6 years |  | 642,203 |  |  | $ | 11.77 |  | 5.9 years
Options exercisable at year-end |  | 404,851 |  |  | $ | 12.58 |  | 4.0 years |  | 419,766 |  |  | $ | 9.20 |  | 4.1 years |  | 399,256 |  |  | $ | 7.62 |  | 4.4 years
Weighted average fair value of options granted during the year |  |  |  |  | $ | 16.83 |  |  |  |  |  |  | $ | 14.14 |  |  |  |  |  |  | $ | 10.96 |  |
Shares available for grant |  | 270,090 |  |  |  |  |  |  |  | 359,690 |  |  |  |  |  |  |  | 454,765 |  |  |  |  |  |
Schedule of assumptions used |
|  | 2018 |  | 2017 |  | 2016
Dividend yield |  | - |  | - |  | -
Expected life |  | 7 years |  | 7 years |  | 7 years
Expected volatility |  | 32.08% |  | 34.63% |  | 43.22%
Risk-free interest rate |  | 2.50% |  | 2.04% |  | 1.65%
Summary of the status of the Company's nonvested restricted stock and changes |
|  | December 31,
|  | 2018 |  | 2017 |  | 2016
|  |  |  |  | Weighted |  |  |  |  | Weighted |  |  |  |  | Weighted
|  |  |  |  | Average |  |  |  |  | Average |  |  |  |  | Average
|  | Restricted |  |  | Grant-Date |  | Restricted |  |  | Grant-Date |  | Restricted |  |  | Grant-Date
|  | Shares |  |  | Fair Value |  | Shares |  |  | Fair Value |  | Shares |  |  | Fair Value
Nonvested at beginning of year |  | 25,000 |  |  | $ | 26.43 |  | 36,125 |  |  | $ | 20.13 |  | 33,749 |  |  | $ | 12.92
Granted |  | 13,000 |  |  |  | 42.87 |  | 6,500 |  |  |  | 35.14 |  | 22,000 |  |  |  | 23.91
Vested |  | (8,375 | ) |  |  | 25.17 |  | (17,625 | ) |  |  | 16.73 |  | (17,749 | ) |  |  | 11.68
Forfeited |  | - |  |  |  | - |  | - |  |  |  | - |  | (1,875 | ) |  |  | 14.72
Nonvested at end of year |  | 29,625 |  |  | $ | 34.00 |  | 25,000 |  |  | $ | 26.43 |  | 36,125 |  |  | $ | 20.13

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