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Earning 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] | The calculation of earnings per common share for the quarters ended March 31, 2017 and 2016 is as follows:
| Quarter Ended March 31,
| 2017 |  | 2016
| (In thousands, except per share data)
Net income | $ | 15,150 |  | $ | 14,171
Less: Dividends on preferred stock |  |  |  |  |
Non-convertible preferred stock (Series A, B, and D) |  | (1,627) |  |  | (1,627)
Convertible preferred stock (Series C) |  | (1,838) |  |  | (1,838)
Income available to common shareholders | $ | 11,685 |  | $ | 10,706
Effect of assumed conversion of the convertible ' ' preferred stock |  | 1,838 |  |  | 1,838
Income available to common shareholders assuming conversion | $ | 13,523 |  | $ | 12,544
Weighted average common shares and share equivalents: |  |  |  |  |
Average common shares outstanding |  | 43,916 |  |  | 43,898
Effect of dilutive securities: |  |  |  |  |
Average potential common shares-options |  | 77 |  |  | 28
Average potential common shares-assuming ' ' conversion of convertible preferred stock |  | 7,138 |  |  | 7,138
Total weighted average common shares ' 'outstanding and equivalents |  | 51,131 |  |  | 51,064
Earnings per common share - basic | $ | 0.27 |  | $ | 0.24
Earnings per common share - diluted | $ | 0.26 |  | $ | 0.24

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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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