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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block] | A summary of the status of these stock option plans is presented in the following table:
|  |  |  | Weighted |
|  |  |  | Average |
|  |  |  | Exercisable |
|  | Number |  | Price |
Outstanding at December 31, 2014 |  |  | 483,629 |  | $ | 10.20 |
Granted |  |  | 52,689 |  |  | 15.05 |
Exercised |  |  | (24,292) |  |  | 8.79 |
Forfeited |  |  | (3,289) |  |  | 10.83 |
Share conversion |  |  | 23,468 |  |  | 9.71 |
Retained by Cornerstone shareholders in merger |  |  | 285,209 |  |  | 11.22 |
Outstanding at December 31, 2015 |  |  | 817,414 |  | $ | 10.62 |
|  |  |  | Weighted |
|  |  |  | Average |
|  |  |  | Exercisable |
|  | Number |  | Price |
Outstanding at December 31, 2013 |  |  | 487,431 |  | $ | 10.21 |
Exercised |  |  | (3,242) |  |  | 10.69 |
Forfeited |  |  | (560) |  |  | 11.00 |
Outstanding at December 31, 2014 |  |  | 483,629 |  | $ | 10.20 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | Information pertaining to options outstanding at December 31, 2015, is as follows:
|  | Options Outstanding |  | Options Exercisable |
|  |  |  | Weighted- |  |  |  |  |  |  |
|  |  |  | Average |  | Weighted- |  |  |  | Weighted- |
|  |  |  | Remaining |  | Average |  |  |  | Average |
Exercise |  | Number |  | Contractual |  | Exercise |  | Number |  | Exercise |
Prices |  | Outstanding |  | Life |  | Price |  | Exercisable |  | Price |
$ | 4.08 |  |  | 1,250 |  |  | 5.8 years |  | $ | 4.08 |  |  | 1,250 |  | $ | 4.08 |
| 4.40 |  |  | 1,250 |  |  | 5.6 years |  |  | 4.40 |  |  | 1,250 |  |  | 4.40 |
| 6.20 |  |  | 750 |  |  | 5.3 years |  |  | 6.20 |  |  | 750 |  |  | 6.20 |
| 6.60 |  |  | 62,250 |  |  | 6.2 years |  |  | 6.60 |  |  | 62,250 |  |  | 6.60 |
| 6.80 |  |  | 33,875 |  |  | 5.2 years |  |  | 6.80 |  |  | 33,875 |  |  | 6.80 |
| 9.48 |  |  | 57,250 |  |  | 7.2 years |  |  | 9.48 |  |  | 57,250 |  |  | 9.48 |
| 9.52 |  |  | 407,400 |  |  | 1.2 years |  |  | 9.52 |  |  | 407,400 |  |  | 9.52 |
| 9.60 |  |  | 70,000 |  |  | 8.2 years |  |  | 9.60 |  |  | 70,000 |  |  | 9.60 |
| 10.00 |  |  | 1,250 |  |  | 7.6 years |  |  | 10.00 |  |  | 1,250 |  |  | 10.00 |
| 10.48 |  |  | 79,220 |  |  | 4.5 years |  |  | 10.48 |  |  | 79,220 |  |  | 10.48 |
| 11.67 |  |  | 5,250 |  |  | 5.1 years |  |  | 11.67 |  |  | 4,200 |  |  | 11.67 |
| 14.29 |  |  | 1,050 |  |  | 2.5 years |  |  | 14.29 |  |  | 1,050 |  |  | 14.29 |
| 14.40 |  |  | 21,630 |  |  | 3.2 years |  |  | 14.40 |  |  | 21,630 |  |  | 14.40 |
| 15.05 |  |  | 52,689 |  |  | 9.8 years |  |  | 15.05 |  |  | - |  |  | 15.05 |
| 31.96 |  |  | 14,454 |  |  | 2.2 years |  |  | 31.96 |  |  | 14,454 |  |  | 31.96 |
| 53.00 |  |  | 4,200 |  |  | 0.2 years |  |  | 53.00 |  |  | 4,200 |  |  | 53.00 |
| 60.80 |  |  | 688 |  |  | 1.3 years |  |  | 60.80 |  |  | 688 |  |  | 60.80 |
| 61.00 |  |  | 2,958 |  |  | 1.2 years |  |  | 61.00 |  |  | 2,958 |  |  | 61.00 |
Outstanding, end of year |  |  | 817,414 |  |  | 3.4 years |  |  | 10.62 |  |  | 763,675 |  |  | 10.31 |
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested [Table Text Block] | Information related to non-vested options for the period ended December 31, 2015, is as follows:
|  |  |  | Weighted |
|  |  |  | Average |
|  |  |  | Grant-Date |
|  | Number |  | Fair Value |
Nonvested at December 31, 2014 |  |  | 7,358 |  | $ | 2.16 |
Granted |  |  | 52,689 |  |  | 12.31 |
Vested |  |  | (6,439) |  |  | 2.05 |
Forfeited/expired |  |  | (237) |  |  | 2.02 |
Share conversion |  |  | 368 |  |  | 2.17 |
Nonvested at December 31, 2015 |  |  | 53,739 |  | $ | 12.12 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | This was determined using the Black-Scholes option-pricing model with the following weighted-average assumptions:
Dividend yield |  | 0.0 | %
Expected life |  | 10Years
Expected volatility |  | 81.7 | %
Risk-free interest rate |  | 1.54 | %

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 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 stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights 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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