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Earning Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| Quarter Ended September 30, |  | Nine-Month Period Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands, except per share data)
Net income | $ | 23,100 |  | $ | 3,319 |  | $ | 59,666 |  | $ | 35,573
Less: Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |
Non-convertible preferred stock (Series A, B, and D) |  | (1,628) |  |  | (1,627) |  |  | (4,883) |  |  | (4,883)
Convertible preferred stock (Series C) |  | (1,838) |  |  | (1,838) |  |  | (5,513) |  |  | (5,513)
Income available to common shareholders | $ | 19,634 |  | $ | (146) |  | $ | 49,270 |  | $ | 25,177
Effect of assumed conversion of the convertible preferred stock |  | 1,838 |  |  | 1,838 |  |  | 5,513 |  |  | 5,513
Income available to common shareholders assuming conversion | $ | 21,472 |  | $ | 1,692 |  | $ | 54,783 |  | $ | 30,690
Weighted average common shares and share equivalents: |  |  |  |  |  |  |  |  |  |  |
Average common shares outstanding |  | 43,996 |  |  | 43,947 |  |  | 43,975 |  |  | 43,937
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Average potential common shares-options |  | 209 |  |  | 17 |  |  | 110 |  |  | 20
Average potential common shares-assuming conversion of convertible preferred stock |  | 7,259 |  |  | 7,138 |  |  | 7,259 |  |  | 7,138
Total weighted average common shares outstanding and equivalents |  | 51,464 |  |  | 51,102 |  |  | 51,344 |  |  | 51,095
Earnings per common share - basic | $ | 0.45 |  | $ | - |  | $ | 1.12 |  | $ | 0.57
Earnings per common share - diluted | $ | 0.42 |  | $ | - |  | $ | 1.07 |  | $ | 0.56

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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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