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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2016
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) |  | 2016 |  | 2015 |  | 2014
Numerator: |  |  |  |  |  |
Net income available to common shareholders |  | $ | 86,135 |  |  | $ | 81,012 |  |  | $ | 83,957 |
Denominator: |  |  |  |  |  |
Weighted-average common shares outstanding |  | 15,332,553 |  |  | 15,364,281 |  |  | 15,394,971 |
Effect of dilutive performance-based restricted stock units |  | 72,607 |  |  | 40,459 |  |  | 18,861 |
Weighted-average common shares outstanding adjusted for the effect of dilutive performance-based restricted stock units |  | 15,405,160 |  |  | 15,404,740 |  |  | 15,413,832 |
Earnings per common share: |  |  |  |  |  |
Basic earnings per common share |  | $ | 5.62 |  |  | $ | 5.27 |  |  | $ | 5.45 |
Diluted earnings per common share |  | $ | 5.59 |  |  | $ | 5.26 |  |  | $ | 5.45 |

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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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