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Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  |  |  |  | Three Months Ended |  | Six Months Ended
|  |  |  |  | June 30, |  | June 30,
(Amounts in thousands, except share and per share amounts) |  | 2014 |  | 2013 |  | 2014 |  | 2013
| Net income |  | $ | 16,828 |  | $ | 13,139 |  | $ | 32,072 |  | $ | 27,301
| Weighted average shares outstanding – basic and diluted |  |  | 5,110,369 |  |  | 5,108,745 |  |  | 5,110,045 |  |  | 5,108,383
| Net income per common share – basic and diluted |  | $ | 3.29 |  | $ | 2.57 |  | $ | 6.28 |  | $ | 5.34

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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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