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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Accounting Policies [Abstract] |
Estimated Useful Lives of Related Assets |
Premises and leasehold improvements |  | 7 – 40 years |
Furniture, fixtures and equipment |  | 3 – 10 years |
Schedule of Earnings Per Share |
|  | 2015 |  | 2014 |  | 2013 |
Year Ended December 31 |  | Basic |  | Diluted |  | Basic |  | Diluted |  | Basic |  | Diluted |
Net Income (Numerator) |  | $ | 17,723 |  | $ | 17,723 |  | $ | 17,649 |  | $ | 17,649 |  | $ | 5,721 |  | $ | 5,721 |
Average common shares outstanding (Denominator) |  |  | 7,516,451 |  |  | 7,516,451 |  |  | 7,548,825 |  |  | 7,561,982 |  |  | 4,733,059 |  |  | 4,733,059 |
Earnings per share |  | $ | 2.36 |  | $ | 2.36 |  | $ | 2.34 |  | $ | 2.34 |  | $ | 1.21 |  | $ | 1.21 |

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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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