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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Stock-Based Compensation [Abstract] |
Summary of Stock Option Activity [Table Text Block] |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | 2016 |  | 2015 |  | 2014
﻿ |  |  | 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 | 194,521 |  | $ | 26.91 |  |  |  |  | 206,463 |  | $ | 26.74 |  |  |  |  | 219,540 |  | $ | 26.64 |  |  |
﻿Granted | 16,000 |  |  | 33.56 |  |  |  |  | 14,500 |  |  | 28.55 |  |  |  |  | 12,500 |  |  | 29.08 |  |  |
﻿Exercised | (30,823) |  |  | 27.34 |  |  |  |  | (16,859) |  |  | 26.19 |  |  |  |  | (25,577) |  |  | 27.05 |  |  |
﻿Forfeited | (19,269) |  |  | 27.86 |  |  |  |  | (9,583) |  |  | 27.02 |  |  |  |  | - |  |  | - |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Outstanding, end of year | 160,429 |  | $ | 27.37 |  | $ | 931,963 |  | 194,521 |  | $ | 26.91 |  | $ | 362,754 |  | 206,463 |  | $ | 26.74 |  | $ | 477,640
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Exercisable, end of year | 144,429 |  | $ | 26.39 |  | $ | 931,963 |  | 180,021 |  | $ | 26.78 |  | $ | 359,854 |  | 193,963 |  | $ | 26.59 |  | $ | 477,640
﻿
Schedule of Fair Value Assumptions [Table Text Block] |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ | Years Ended December 31,
﻿ | 2016 |  | 2015 |  | 2014
﻿Dividend yield |  | 3.93% |  |  | 3.77% |  |  | 3.57%
﻿Expected life |  | 10 years |  |  | 10 years |  |  | 10 years
﻿Expected volatility |  | 24.84% |  |  | 24.35% |  |  | 24.97%
﻿Risk-free interest rate |  | 2.44% |  |  | 2.28% |  |  | 2.17%
﻿Weighted average fair value of options granted | $ | 5.79 |  | $ | 4.89 |  | $ | 5.30
﻿
Schedule of Outstanding Stock Options [Table Text Block] |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  | Average |  |  |  |  |  | Average
﻿ | Options |  | Exercise |  | Remaining |  | Options |  | Exercise
﻿ | Outstanding |  | Price |  | Life, Years |  | Exercisable |  | Price
﻿ | 12,650 |  | $ | 28.41 |  | 1.0 |  | 12,650 |  | $ | 28.41
﻿ | 13,200 |  |  | 25.00 |  | 2.0 |  | 13,200 |  |  | 25.00
﻿ | 12,650 |  |  | 25.99 |  | 3.0 |  | 12,650 |  |  | 25.99
﻿ | 1,100 |  |  | 24.44 |  | 3.2 |  | 1,100 |  |  | 24.44
﻿ | 15,229 |  |  | 25.25 |  | 4.0 |  | 15,229 |  |  | 25.25
﻿ | 19,800 |  |  | 24.97 |  | 5.0 |  | 19,800 |  |  | 24.97
﻿ | 21,450 |  |  | 27.05 |  | 6.0 |  | 21,450 |  |  | 27.05
﻿ | 1,100 |  |  | 27.55 |  | 6.0 |  | 1,100 |  |  | 27.55
﻿ | 2,000 |  |  | 28.95 |  | 6.7 |  | 2,000 |  |  | 28.95
﻿ | 21,250 |  |  | 26.90 |  | 7.0 |  | 21,250 |  |  | 26.90
﻿ | 10,000 |  |  | 29.08 |  | 8.0 |  | 10,000 |  |  | 29.08
﻿ | 14,000 |  |  | 28.55 |  | 9.0 |  | 14,000 |  |  | 28.55
﻿ | 16,000 |  |  | 33.56 |  | 10.0 |  | - |  |  | -
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿Total | 160,429 |  |  |  |  |  |  | 144,429 |  |  |
﻿
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
﻿ |  |  |  |  |  |  |  |
﻿ |  | 2016 |  | 2015
﻿ |  |  |  | Weighted-Average |  |  |  | Weighted-Average
﻿ |  | Number of |  | Grant Date |  | Number of |  | Grant Date
﻿ |  | Shares |  | Fair Value |  | Shares |  | Fair Value
﻿ |  |  |  |  |  |  |  |
﻿Non-vested, beginning of year |  | 13,810 |  | $28.82 |  | 9,300 |  | $29.08
﻿Granted |  | 8,450 |  | 33.56 |  | 6,650 |  | 28.55
﻿Vested |  | (3,120) |  | 28.85 |  | (1,860) |  | 29.08
﻿Forfeited |  | (450) |  | 28.80 |  | (280) |  | 29.08
﻿Non-vested at December 31 |  | 18,690 |  | $30.96 |  | 13,810 |  | $28.82
﻿

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://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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- Definition Tabular disclosure of the number of fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both options (or share units) currently outstanding and options (or share units) exercisable (or convertible). + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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