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Earnings per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2018
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:
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (in thousands, except per share amounts) |
Net income available to common stockholders |  | $ | 60,352 |  |  | $ | 43,220 |  |  | $ | 31,060 |
Earnings allocated to participating securities |  |  | (139) |  |  |  | (141) |  |  |  | (147) |
Income attributable to common stock |  | $ | 60,213 |  |  | $ | 43,079 |  |  | $ | 30,913 |
Weighted average common shares outstanding, including participating securities |  |  | 32,198 |  |  |  | 31,943 |  |  |  | 30,453 |
Weighted average participating securities |  |  | (74) |  |  |  | (41) |  |  |  | (54) |
Weighted average common shares outstanding |  |  | 32,124 |  |  |  | 31,902 |  |  |  | 30,399 |
Incremental shares from assumed conversions of options, performance units and restricted shares |  |  | 233 |  |  |  | 335 |  |  |  | 291 |
Weighted average common and equivalent shares outstanding |  |  | 32,357 |  |  |  | 32,237 |  |  |  | 30,690 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.87 |  |  | $ | 1.35 |  |  | $ | 1.02 |
Diluted |  |  | 1.86 |  |  |  | 1.34 |  |  |  | 1.01 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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