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Earning Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 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 and six-month periods ended June 30, 2017 and 2016 is as follows:
| Quarter Ended June 30, |  | Six-Month Period Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (In thousands, except per share data)
Net income | $ | 17,104 |  | $ | 14,339 |  | $ | 32,254 |  | $ | 28,510
Less: Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |
Non-convertible preferred stock (Series A, B, and D) |  | (1,629) |  |  | (1,629) |  |  | (3,256) |  |  | (3,256)
Convertible preferred stock (Series C) |  | (1,837) |  |  | (1,837) |  |  | (3,675) |  |  | (3,675)
Income available to common shareholders | $ | 13,638 |  | $ | 10,873 |  | $ | 25,323 |  | $ | 21,579
Effect of assumed conversion of the convertible ' ' preferred stock |  | 1,837 |  |  | 1,837 |  |  | 3,675 |  |  | 3,675
Income available to common shareholders assuming conversion | $ | 15,475 |  | $ | 12,710 |  | $ | 28,998 |  | $ | 25,254
Weighted average common shares and share equivalents: |  |  |  |  |  |  |  |  |  |  |
Average common shares outstanding |  | 43,947 |  |  | 43,914 |  |  | 43,931 |  |  | 43,906
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Average potential common shares-options |  | 15 |  |  | 43 |  |  | 24 |  |  | 37
Average potential common shares-assuming ' ' conversion of convertible preferred stock |  | 7,138 |  |  | 7,138 |  |  | 7,138 |  |  | 7,138
Total weighted average common shares ' 'outstanding and equivalents |  | 51,100 |  |  | 51,095 |  |  | 51,093 |  |  | 51,081
Earnings per common share - basic | $ | 0.30 |  | $ | 0.25 |  | $ | 0.58 |  | $ | 0.49
Earnings per common share - diluted | $ | 0.30 |  | $ | 0.25 |  | $ | 0.57 |  | $ | 0.49

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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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