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Other comprehensive income (loss) (Tables) | 9 Months Ended
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Sep. 30, 2021
Other comprehensive income (loss) |
Schedule of components of accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | September 30, 2021 |  | ​ | December 31, 2020 |
Net unrealized gain on investment securities available-for-sale | ​ | $ | 1,287 | ​ | $ | 9,696 | ​
Income tax expense | ​ |  | 270 | ​ |  | 2,036 | ​
Net of income taxes | ​ |  | 1,017 | ​ |  | 7,660 | ​
Benefit plan adjustments | ​ |  | (7,977) | ​ |  | (7,977) | ​
Income tax benefit | ​ |  | (1,675) | ​ |  | (1,675) | ​
Net of income taxes | ​ |  | (6,302) | ​ |  | (6,302) | ​
Derivative adjustments | ​ |  | 980 | ​ |  | 1,002 | ​
Income tax | ​ |  | 206 | ​ |  | 211 | ​
Net of income taxes | ​ |  | 774 | ​ |  | 791 | ​
Accumulated other comprehensive income (loss) | ​ | $ | (4,511) | ​ | $ | 2,149 | ​

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