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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Schedule of computation of basic and diluted earnings per common share | The following table sets forth the computation of basic and diluted earnings per common share:
Year ended December 31 (In thousands, except share data) |  | 2013 |  | 2012 |  | 2011
Numerator: |  |  |  |  |  |
Net income available to common shareholders |  | $ | 77,227 |  |  | $ | 75,205 |  |  | $ | 76,284 |
Denominator: |  |  |  |  |  |
Basic earnings per common share: |  |  |  |  |  |
Weighted-average shares |  | 15,412,365 |  |  | 15,407,078 |  |  | 15,400,155 |
Effect of dilutive securities – stock options and warrants |  | — |  |  | 1,063 |  |  | 1,291 |
Diluted earnings per common share: |  |  |  |  |  |
Adjusted weighted-average shares and assumed conversions |  | 15,412,365 |  |  | 15,408,141 |  |  | 15,401,446 |
Earnings per common share: |  |  |  |  |  |
Basic earnings per common share |  | $ | 5.01 |  |  | $ | 4.88 |  |  | $ | 4.95 |
Diluted earnings per common share |  | $ | 5.01 |  |  | $ | 4.88 |  |  | $ | 4.95 |

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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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