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Short-term borrowings (Tables) | 12 Months Ended
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Dec. 31, 2021
Short-term borrowings |
Summary of short-term borrowings | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At and for the year ended December 31, 2021 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Maximum | ​ | Weighted | ​ | Average |
​ | ​ | Ending | ​ | Average | ​ | Month-End | ​ | Average | ​ | Rate at End |
​ |  | Balance |  | Balance |  | Balance |  | Rate |  | of the Year |
FHLB advances | ​ | $ | ​ | ​ | $ | 13,973 | ​ | $ | 50,000 |  | 0.56 | % | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At and for the year ended December 31, 2020 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | Weighted |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Maximum | ​ | Average | ​ | Average |
​ | ​ | Ending | ​ | Average | ​ | Month-End | ​ | Rate for | ​ | Rate at End |
​ |  | Balance |  | Balance |  | Balance |  | the Year |  | of the Year |
FHLB advances | ​ | $ | 50,000 | ​ | $ | 83,716 | ​ | $ | 179,199 |  | 1.01 | % | 0.40 | %
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At and for the year ended December 31, 2019 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | Weighted |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Maximum | ​ | Average | ​ | Average |
​ | ​ | Ending | ​ | Average | ​ | Month-End | ​ | Rate for | ​ | Rate at End |
​ |  | Balance |  | Balance |  | Balance |  | the Year |  | of the Year |
FHLB advances | ​ | $ | 152,150 | ​ | $ | 62,941 | ​ | $ | 152,150 |  | 2.61 | % | 1.84 | %
Schedule of long-term debt consisting of advances | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Interest Rate |  | ​ | ​ |  | ​ | ​ |
Due | ​ | Fixed | ​ | ​ | ​ | December 31, 2021 | ​ | ​ | December 31, 2020 |
June 2021 | ​ | 1.99 | ​ | ​ | ​ | ​ | ​ | $ | 10,000 | ​
March 2023 | ​ | 4.69 | ​ | ​ | $ | 2,711 | ​ | ​ | 4,769 | ​
​ | ​ | ​ | ​ | ​ | $ | 2,711 | ​ | $ | 14,769 | ​
Schedule of maturities of long-term debt | ​
​ | ​ | ​ | ​ | ​
2022 | ​ |  | 2,156 | ​
2023 | ​ |  | 555 | ​
​ | ​ | $ | 2,711 | ​

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