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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Stock Based Compensation [Abstract] |
Schedule Of Share-based Compensation, Stock Options, Activity | ﻿
﻿ |  |  |  |  |  |  |
﻿(Dollars in thousands except share and per share data) |  |  |  |  |  |  |
﻿ | ESPP |  | Weighted Average |  | Aggregate
﻿ | Options |  | Price Per Share |  | Intrinsic Value
﻿Balance Outstanding at December 31, 2015 | 22,286 |  | $ | 23.42 |  | $ | 2
﻿Granted | 24,434 |  |  | 22.46 |  |  |
﻿Exercised | (907) |  |  | 22.66 |  |  |
﻿Expired | (23,055) |  |  | 23.38 |  |  |
﻿Balance Outstanding at December 31, 2016 | 22,758 |  | $ | 22.46 |  | $ | 140
﻿Granted | 19,086 |  |  | 29.95 |  |  |
﻿Exercised | (6,827) |  |  | 23.00 |  |  |
﻿Expired | (17,180) |  |  | 22.79 |  |  |
﻿Balance Outstanding at December 31, 2017 | 17,837 |  | $ | 29.95 |  | $ | 132
﻿Granted | 19,790 |  |  | 32.73 |  |  |
﻿Exercised | (3,257) |  |  | 30.54 |  |  |
﻿Expired | (15,992) |  |  | 30.07 |  |  |
﻿Balance Outstanding at December 31, 2018 | 18,378 |  | $ | 32.73 |  | $ | —
﻿ |  |  |  |  |  |  |
﻿Shares available for future grants at December 31, 2018 | 196,284 |  |  |  |  |  |
﻿ ﻿
﻿ |  |  |  |  |  |  |
﻿ | ISOP |  | Weighted Average |  | Aggregate
﻿ | Options |  | Price Per Share |  | Intrinsic Value
﻿Balance Outstanding at December 31, 2015 | 53,075 |  | $ | 22.56 |  | $ | 50
﻿Granted | 24,450 |  |  | 21.27 |  |  |
﻿Exercised | (3,800) |  |  | 16.00 |  |  |
﻿Forfeited | (15,000) |  |  | 24.14 |  |  |
﻿Balance Outstanding at December 31, 2016 | 58,725 |  | $ | 22.03 |  | $ | 386
﻿Granted | 33,450 |  |  | 30.00 |  |  |
﻿Exercised | (750) |  |  | 23.77 |  |  |
﻿Forfeited | (6,200) |  |  | 27.37 |  |  |
﻿Balance Outstanding at December 31, 2017 | 85,225 |  | $ | 24.75 |  | $ | 1,075
﻿Granted | 34,054 |  |  | 34.10 |  |  |
﻿Exercised | (12,268) |  |  | 21.55 |  |  |
﻿Forfeited | (3,000) |  |  | 23.77 |  |  |
﻿Balance Outstanding at December 31, 2018 | 104,011 |  | $ | 28.22 |  | $ | 341
﻿ |  |  |  |  |  |  |
﻿Shares available for future grants at December 31, 2018 | 259,123 |  |  |  |  |  |
﻿
Share-based Compensation Arrangement By Share-based Payment Award, Options, Vested And Expected To Vest, Outstanding And Exercisable |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  | Options |  |  |  |  |  |  |  | Weighted
﻿ |  | Outstanding |  |  | Exercise Price or |  | Weighted Average |  | Average Remaining
﻿Stock Option Plan |  | and Exercisable |  |  | Price Range |  | Exercise Price |  | Life (years)
﻿Employee Stock Purchase Plan |  | 18,378 |  | $ | 32.73 |  | $ | 32.73 |  | 0.5
﻿ |  |  |  |  |  |  |  |  |  |
﻿Incentive Stock Option Plan |  | 3,107 |  |  | 16.11 |  |  | 16.11 |  | 0.2
﻿Incentive Stock Option Plan |  | 33,400 |  |  | 21.27 - 22.05 |  |  | 21.56 |  | 6.8
﻿Incentive Stock Option Plan |  | 67,504 |  |  | 30.00 - 34.10 |  |  | 32.07 |  | 8.7
﻿ISOP Total/Average |  | 104,011 |  |  |  |  | $ | 28.22 |  | 7.8
﻿
Valuation Assumptions Using Black-Scholes Method |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | 2018 |  | 2017 |  | 2016
﻿Incentive Stock Option Plan |  |  |  |  |  |  |  |  |
﻿Options granted |  |  | 34,054 |  |  | 33,450 |  |  | 24,450
﻿Risk-free interest rate |  |  | 2.66% |  |  | 1.87% |  |  | 1.22%
﻿Expected volatility of the Corporation's stock |  |  | 19.51% |  |  | 23.12% |  |  | 25.76%
﻿Expected dividend yield |  |  | 2.49% |  |  | 2.94% |  |  | 3.23%
﻿Expected life (in years) |  |  | 5.25 |  |  | 5.25 |  |  | 5.25
﻿Weighted average fair value of options granted |  | $ | 5.42 |  | $ | 4.81 |  | $ | 3.58
﻿ |  |  |  |  |  |  |  |  |
﻿(Dollars in thousands) |  |  |  |  |  |  |  |  |
﻿Compensation expense included in net income |  |  |  |  |  |  |  |  |
﻿ESPP |  | $ | — |  | $ | — |  | $ | —
﻿ISOP |  |  | 185 |  |  | 161 |  |  | 88
﻿Total compensation expense included in net income |  | $ | 185 |  | $ | 161 |  | $ | 88
﻿

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