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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2012
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) |  | 2012 |  | 2011 |  | 2010
Numerator: |  |  |  |  |  |
Net income available to common shareholders |  | $ | 75,205 |  |  | $ | 76,284 |  |  | $ | 52,294 |
Denominator: |  |  |  |  |  |
Basic earnings per common share: |  |  |  |  |  |
Weighted-average shares |  | 15,407,078 |  |  | 15,400,155 |  |  | 15,152,692 |
Effect of dilutive securities – stock options and warrants |  | 1,063 |  |  | 1,291 |  |  | 3,043 |
Diluted earnings per common share: |  |  |  |  |  |
Adjusted weighted-average shares and assumed conversions |  | 15,408,141 |  |  | 15,401,446 |  |  | 15,155,735 |
Earnings per common share: |  |  |  |  |  |
Basic earnings per common share |  | $ | 4.88 |  |  | $ | 4.95 |  |  | $ | 3.45 |
Diluted earnings per common share |  | $ | 4.88 |  |  | $ | 4.95 |  |  | $ | 3.45 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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