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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Summary of earnings per share |
|  | Twelve Months Ended Dec., 31 |
($ in thousands - except per share data) |  | 2017 |  |  | 2016 |  |  | 2015 |
Distributed earnings allocated to common shares |  | $ | 1,363 |  |  | $ | 1,180 |  |  | $ | 982 |
Undistributed earnings allocated to common shares |  |  | 8,714 |  |  |  | 6,620 |  |  |  | 5,676 |
Net earnings allocated to common shares |  |  | 10,077 |  |  |  | 7,800 |  |  |  | 6,658 |
Net earnings allocated to participating securities |  |  | 13 |  |  |  | 9 |  |  |  | 5 |
Dividends on convertible preferred shares |  |  | 975 |  |  |  | 975 |  |  |  | 956 |
Net Income allocated to common shares and participating securities |  | $ | 11,065 |  |  | $ | 8,784 |  |  | $ | 7,619 |
Weighted average shares outstanding for basic earnings per share |  |  | 4,817 |  |  |  | 4,877 |  |  |  | 4,884 |
Dilutive effect of stock compensation |  |  | 74 |  |  |  | 47 |  |  |  | 88 |
Dilutive effect of convertible shares |  |  | 1,460 |  |  |  | 1,452 |  |  |  | 1,451 |
Weighted average shares outstanding for diluted earnings per share |  |  | 6,351 |  |  |  | 6,376 |  |  |  | 6,423 |
Basic earnings per common share |  | $ | 2.10 |  |  | $ | 1.60 |  |  | $ | 1.36 |
Diluted earnings per common share |  | $ | 1.74 |  |  | $ | 1.38 |  |  | $ | 1.19 |

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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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