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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  |  |  |  | Three Months Ended |  | Nine Months Ended
|  |  |  |  | September 30, |  | September 30,
(Amounts in thousands, except share and per share amounts) |  | 2015 |  | 2014 |  | 2015 |  | 2014
| Net income |  | $ | 18,172 |  | $ | 17,692 |  | $ | 53,335 |  | $ | 49,764
| Weighted average shares outstanding – basic and diluted |  |  | 5,113,077 |  |  | 5,111,201 |  |  | 5,112,108 |  |  | 5,110,435
| Net income per common share – basic and diluted |  | $ | 3.55 |  | $ | 3.46 |  | $ | 10.43 |  | $ | 9.74

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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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