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Long-term debt (Tables) | 12 Months Ended
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Dec. 31, 2023
Long-term debt |
Schedule of long-term debt consisting of advances | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Interest Rate | ​ |  | ​ | ​ |  | ​ | ​ |
(Dollars in thousands, except percents) |  | Fixed | ​ | ​ | ​ | December 31, 2023 | ​ | ​ | December 31, 2022 |
March 2023 | ​ | 4.69 | % | ​ | $ | ​ | ​ | $ | 555 | ​
March 2025 | ​ | 4.37 | ​ | ​ | ​ | 10,000 | ​ | ​ | ​ | ​
March 2026 | ​ | 4.20 | ​ | ​ | ​ | 15,000 | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | $ | 25,000 | ​ | $ | 555 | ​
Schedule of maturities of long-term debt | ​
​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | ​ | ​ | ​
2025 | ​ | $ | 10,000 | ​
2026 | ​ |  | 15,000 | ​
​ | ​ | $ | 25,000 | ​

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