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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2020
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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019 | ​ | 2018 |
For the Year Ended December 31 | ​ | Basic | ​ | Diluted | ​ | Basic | ​ | Diluted | ​ | Basic | ​ | Diluted |
Net income |  | $ | 29,354 |  | $ | 29,354 |  | $ | 25,736 | ​ | $ | 25,736 |  | $ | 24,920 |  | $ | 24,920 | ​
Average common shares outstanding | ​ |  | 7,304,956 | ​ |  | 7,337,843 | ​ |  | 7,395,429 | ​ |  | 7,412,369 | ​ |  | 7,397,797 | ​ |  | 7,402,900 | ​
Earnings per share | ​ | $ | 4.02 | ​ | $ | 4.00 | ​ | $ | 3.48 | ​ | $ | 3.47 | ​ | $ | 3.37 | ​ | $ | 3.37 | ​

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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