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Earnings per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings per common share: |
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 |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | (in thousands, except for per share data)
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Net income available to common stockholders |  | $ | 13,035 |  |  | $ | 11,812 |  |  | $ | 32,534 |  |  | $ | 33,106 |
Earnings allocated to participating securities |  |  | 42 |  |  |  | 44 |  |  |  | 106 |  |  |  | 22 |
Income attributable to common stock |  | $ | 13,077 |  |  | $ | 11,856 |  |  | $ | 32,640 |  |  | $ | 33,128 |
Weighted average common shares outstanding, including participating securities |  |  | 32,015 |  |  |  | 30,143 |  |  |  | 31,999 |  |  |  | 30,094 |
Weighted average participating securities |  |  | (103 | ) |  |  | (113 | ) |  |  | (104 | ) |  |  | (98 | )
Weighted average common shares outstanding |  |  | 31,912 |  |  |  | 30,030 |  |  |  | 31,895 |  |  |  | 29,996 |
Incremental shares from assumed conversions of options, performance units and restricted shares |  |  | 270 |  |  |  | 329 |  |  |  | 272 |  |  |  | 351 |
Weighted average common and equivalent shares outstanding |  |  | 32,182 |  |  |  | 30,359 |  |  |  | 32,167 |  |  |  | 30,347 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.41 |  |  | $ | 0.39 |  |  | $ | 1.02 |  |  | $ | 1.10 |
Diluted |  |  | 0.41 |  |  |  | 0.39 |  |  |  | 1.01 |  |  |  | 1.09

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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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