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Compensation and Employee Benefit Plans [Text Block] (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] |  |
|  | Projected Payments |
2016 |  | $ | 29,000 |
2017 |  |  | 23,000 |
2018 |  |  | 18,000 |
2019 |  |  | 12,000 |
2020 |  |  | 10,000 |
2021 |  |  | 2,000 |
Total |  | $ | 94,000 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | 2016 |  |  | Weighted- average Exercise Price |  |  | 2015 |  |  | Weighted- average Exercise Price |
Outstanding, January 1 |  |  | 31,949 |  |  | $ | 25.03 |  |  |  | 46,451 |  |  | $ | 27.90 |
Expired |  |  | — |  |  |  | — |  |  |  | (3,639 | ) |  |  | 37.33 |
Exercised |  |  | — |  |  |  | — |  |  |  | (1,025 | ) |  |  | 20.21 |
Outstanding, September 30 |  |  | 31,949 |  |  | $ | 25.03 |  |  |  | 41,787 |  |  | $ | 27.27 |
Exercisable, September 30 |  |  | 31,949 |  |  | $ | 25.03 |  |  |  | 41,787 |  |  | $ | 27.27 |
|  | 2015 |  |  | Weighted- average Exercise Price |  |  | 2014 |  |  | Weighted- average Exercise Price |
Outstanding, January 1 |  | $ | 46,451 |  |  | $ | 27.90 |  |  | $ | 58,581 |  |  | $ | 28.38 |
Expired |  |  | (10,802 | ) |  |  | 36.93 |  |  |  | — |  |  |  | — |
Exercised |  |  | (2,175 | ) |  |  | 21.31 |  |  |  | (11,223 | ) |  |  | 30.45 |
Forfeited |  |  | (1,525 | ) |  |  | 33.53 |  |  |  | (907 | ) |  |  | 27.35 |
Outstanding, December 31 |  | $ | 31,949 |  |  | $ | 25.03 |  |  | $ | 46,451 |  |  | $ | 27.90 |
Exercisable, December 31 |  | $ | 31,949 |  |  | $ | 25.03 |  |  | $ | 46,451 |  |  | $ | 27.90 |
Schedule of Other Share-based Compensation, Activity [Table Text Block] |  |
|  |  |  |  | Outstanding |  |  | Exercisable |
Grant Date |  | Exercise Price |  |  | Shares |  |  | Contractual Average Life |  |  | Average Exercise Price |  |  | Shares |  |  | Average Exercise Price |
December 10, 2006 |  |  | 40.24 |  |  |  | 2,625 |  |  |  | 0.94 |  |  |  | 40.24 |  |  |  | 2,625 |  |  |  | 40.24 |
May 16, 2007 |  |  | 37.48 |  |  |  | 1,337 |  |  |  | 1.37 |  |  |  | 37.48 |  |  |  | 1,337 |  |  |  | 37.48 |
December 10, 2007 |  |  | 37.00 |  |  |  | 1,950 |  |  |  | 1.94 |  |  |  | 37.00 |  |  |  | 1,950 |  |  |  | 37.00 |
January 2, 2008 |  |  | 36.25 |  |  |  | 1,337 |  |  |  | 2.00 |  |  |  | 36.25 |  |  |  | 1,337 |  |  |  | 36.25 |
November 10, 2008 |  |  | 23.00 |  |  |  | 16,500 |  |  |  | 2.86 |  |  |  | 23.00 |  |  |  | 16,500 |  |  |  | 23.00 |
May 9, 2011 |  |  | 17.55 |  |  |  | 8,200 |  |  |  | 5.35 |  |  |  | 17.55 |  |  |  | 8,200 |  |  |  | 17.55 |
|  |  |  |  |  |  | 31,949 |  |  |  |  |  |  |  |  |  |  |  | 31,949 |  |  |  |  |

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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards. + 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)(2) -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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