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Earnings per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | Earnings per common share have been computed based on the following:
| Three Months Ended
| March 31,
(dollars in thousands, except for per share data) | 2017 |  | 2016
Net income available to common stockholders | $ | 11,880 |  |  | $ | 10,369 |
Earnings allocated to participating securities |  | 27 |  |  |  | 22 |
Income attributable to common stock | $ | 11,853 |  |  | $ | 10,347 |
Weighted average common shares outstanding, including |  |  |  |  |  |  |
participating securities |  | 31,938 |  |  |  | 30,020 |
Weighted average participating securities |  | (72 | ) |  |  | (63 | )
Weighted average common shares outstanding |  | 31,866 |  |  |  | 29,957 |
Incremental shares from assumed conversions of options, |  |  |  |  |  |  |
performance units and restricted shares |  | 327 |  |  |  | 289 |
Weighted average common and equivalent shares outstanding |  | 32,193 |  |  |  | 30,246 |
Earnings per common share: |  |  |  |  |  |  |
Basic | $ | 0.37 |  |  | $ | 0.35 |
Diluted |  | 0.37 |  |  |  | 0.34

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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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