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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of significant accounting policies |
Schedule of estimated useful life of related assets |
Premises and leasehold improvements |  | 7 – 40 years |
Furniture, fixtures and equipment |  | 3 – 10 years |
Schedule of earnings per share |
|  | 2017 |  | 2016 |  | 2015 |
For the Year Ended December 31 |  | Basic |  | Diluted |  | Basic |  | Diluted |  | Basic |  | Diluted |
Net Income |  | $ | 18,457 |  | $ | 18,457 |  | $ | 19,583 |  | $ | 19,583 |  | $ | 17,723 |  | $ | 17,723 |
Average common shares outstanding |  |  | 7,395,837 |  |  | 7,395,837 |  |  | 7,396,716 |  |  | 7,396,716 |  |  | 7,516,451 |  |  | 7,516,451 |
Earnings per share |  | $ | 2.50 |  | $ | 2.50 |  | $ | 2.65 |  | $ | 2.65 |  | $ | 2.36 |  | $ | 2.36 |

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- Definition Tabular disclosure of the useful life of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References No definition available. + Details
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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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