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Earnings per share (Tables) | 3 Months Ended
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Mar. 31, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  |  |  |  | Three Months Ended
|  |  |  |  | March 31,
(Amounts in thousands, except share and per share amounts) |  | 2014 |  | 2013
| Net income |  | $ | 15,244 |  | $ | 14,162
| Weighted average shares outstanding – basic and diluted |  |  | 5,109,717 |  |  | 5,108,016
| Net income per common share – basic and diluted |  | $ | 2.98 |  | $ | 2.77

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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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