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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Summary of significant accounting policies |
Schedule of estimated useful life of related assets | ​
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Premises and leasehold improvements |  | 7 – 40 years | ​
Furniture, fixtures and equipment |  | 3 – 10 years | ​
Schedule of earnings per share | ​
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(Dollars in thousands, except per share data) | ​ | 2023 | ​ | 2022 | ​ | 2021 | ​
For the Twelve Months Ended December 31, | ​ | Basic | ​ | Diluted | ​ | Basic | ​ | Diluted | ​ | Basic | ​ | Diluted |
Net income |  | $ | 27,380 |  | $ | 27,380 |  | $ | 38,090 | ​ | $ | 38,090 |  | $ | 43,519 |  | $ | 43,519 | ​
Average common shares outstanding | ​ |  | 7,107,908 | ​ |  | 7,151,471 | ​ |  | 7,168,092 | ​ |  | 7,211,643 | ​ |  | 7,196,160 | ​ |  | 7,235,303 | ​
Earnings per share | ​ | $ | 3.85 | ​ | $ | 3.83 | ​ | $ | 5.31 | ​ | $ | 5.28 | ​ | $ | 6.05 | ​ | $ | 6.02 | ​

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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