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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Accounting Policies [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The shares used in the calculation of basic and diluted earnings per share, which have been adjusted to give effect to the 5% common stock dividends paid by the Company in December 2015, 2014 and 2013, are shown below:
(Dollars in thousands, except per share amounts) |  | Years ended December 31, |
|  | 2015 |  | 2014 |  | 2013 |
Net earnings available to common shareholders |  | $ | 10,506 |  | $ | 8,049 |  | $ | 4,655 |
Weighted average common shares outstanding - basic |  |  | 3,507,328 |  |  | 3,493,240 |  |  | 3,400,734 |
Assumed exercise of stock options |  |  | 104,716 |  |  | 59,190 |  |  | 51,707 |
Weighted average common shares outstanding - diluted |  |  | 3,612,044 |  |  | 3,552,430 |  |  | 3,452,441 |
Earnings per share: |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 3.00 |  | $ | 2.30 |  | $ | 1.37 |
Diluted |  | $ | 2.91 |  | $ | 2.27 |  | $ | 1.35 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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