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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Stock-Based Compensation [Abstract] |
Summary of Stock Option Activity |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | 2017 |  | 2016 |  | 2015
﻿ |  |  | Weighted |  |  |  |  |  | Weighted |  |  |  |  |  | Weighted |  |  |
﻿ |  |  | Average |  | Average |  |  |  | Average |  | Average |  |  |  | Average |  | Aggregate
﻿ |  |  | Exercise |  | Intrinsic |  |  |  | Exercise |  | Intrinsic |  |  |  | Exercise |  | Intrinsic
﻿ | Options |  | Price |  | Value |  | Options |  | Price |  | Value |  | Options |  | Price |  | Value
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Outstanding, beginning of year | 225,669 |  | $ | 19.46 |  |  |  |  | 276,807 |  | $ | 17.94 |  |  |  |  | 294,720 |  | $ | 17.83 |  |  |
﻿Granted | 34,750 |  |  | 32.81 |  |  |  |  | 24,000 |  |  | 22.37 |  |  |  |  | 21,750 |  |  | 19.03 |  |  |
﻿Exercised | (44,219) |  |  | 23.53 |  |  |  |  | (46,235) |  |  | 18.23 |  |  |  |  | (25,289) |  |  | 17.46 |  |  |
﻿Forfeited | (3,475) |  |  | 21.71 |  |  |  |  | (28,904) |  |  | 18.57 |  |  |  |  | (14,375) |  |  | 18.01 |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Outstanding, end of year | 212,725 |  | $ | 20.76 |  | $ | 2,604,097 |  | 225,669 |  | $ | 19.46 |  | $ | 931,963 |  | 276,807 |  | $ | 17.94 |  | $ | 362,754
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Exercisable, end of year | 177,975 |  | $ | 18.41 |  | $ | 2,597,494 |  | 216,644 |  | $ | 17.59 |  | $ | 931,963 |  | 270,032 |  | $ | 17.85 |  | $ | 359,854
﻿
Schedule of Fair Value Assumptions |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ | Years Ended December 31,
﻿ | 2017 |  | 2016 |  | 2015
﻿Dividend yield |  | 3.89% |  |  | 3.93% |  |  | 3.77%
﻿Expected life |  | 10 years |  |  | 10 years |  |  | 10 years
﻿Expected volatility |  | 29.11% |  |  | 24.84% |  |  | 24.35%
﻿Risk-free interest rate |  | 2.41% |  |  | 2.44% |  |  | 2.28%
﻿Weighted average fair value of options granted | $ | 6.83 |  | $ | 5.79 |  | $ | 4.89
﻿
Schedule of Outstanding Stock Options |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  | Average |  |  |  |  |  | Average
﻿ | Options |  | Exercise |  | Remaining |  | Options |  | Exercise
﻿ | Outstanding |  | Price |  | Life, Years |  | Exercisable |  | Price
﻿ | 9,075 |  | $ | 16.67 |  | 1.0 |  | 9,075 |  | $ | 16.67
﻿ | 17,325 |  |  | 17.33 |  | 2.0 |  | 17,325 |  |  | 17.33
﻿ | 15,675 |  |  | 16.83 |  | 3.0 |  | 15,675 |  |  | 16.83
﻿ | 20,625 |  |  | 16.65 |  | 4.0 |  | 20,625 |  |  | 16.65
﻿ | 29,700 |  |  | 18.03 |  | 5.0 |  | 29,700 |  |  | 18.03
﻿ | 1,650 |  |  | 18.36 |  | 5.0 |  | 1,650 |  |  | 18.36
﻿ | 3,000 |  |  | 19.30 |  | 5.8 |  | 3,000 |  |  | 19.30
﻿ | 26,925 |  |  | 17.93 |  | 6.0 |  | 26,925 |  |  | 17.93
﻿ | 14,250 |  |  | 19.39 |  | 6.9 |  | 14,250 |  |  | 19.39
﻿ | 16,500 |  |  | 19.03 |  | 7.9 |  | 16,500 |  |  | 19.03
﻿ | 23,250 |  |  | 22.37 |  | 9.0 |  | 23,250 |  |  | 22.37
﻿ | 34,750 |  |  | 32.81 |  | 10.0 |  | - |  |  | -
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿Total | 212,725 |  |  |  |  |  |  | 177,975 |  |  |
﻿
Summary of Restricted Stock Activity |
﻿ |  |  |  |  |  |  |  |
﻿ |  | 2017 |  | 2016
﻿ |  |  |  | Weighted-Average |  |  |  | Weighted-Average
﻿ |  | Number of |  | Grant Date |  | Number of |  | Grant Date
﻿ |  | Shares |  | Fair Value |  | Shares |  | Fair Value
﻿ |  |  |  |  |  |  |  |
﻿Non-vested, beginning of year |  | 28,035 |  | $20.64 |  | 20,715 |  | $19.21
﻿Granted |  | 9,400 |  | 32.81 |  | 12,675 |  | 22.37
﻿Vested |  | (7,020) |  | 20.37 |  | (4,680) |  | 19.23
﻿Forfeited |  | - |  | - |  | (675) |  | 19.20
﻿Non-vested at December 31 |  | 30,415 |  | $24.46 |  | 28,035 |  | $20.64
﻿

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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