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Other comprehensive income (loss) (Tables) | 6 Months Ended
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Jun. 30, 2022
Other comprehensive loss |
Schedule of components of accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | June 30, 2022 |  | ​ | December 31, 2021 |
Net unrealized loss on investment securities available-for-sale | ​ | $ | (53,072) | ​ | $ | (1,791) | ​
Income tax benefit | ​ |  | (11,145) | ​ |  | (376) | ​
Net of income taxes | ​ |  | (41,927) | ​ |  | (1,415) | ​
Benefit plan adjustments | ​ |  | (5,868) | ​ |  | (5,868) | ​
Income tax benefit | ​ |  | (1,232) | ​ |  | (1,232) | ​
Net of income taxes | ​ |  | (4,636) | ​ |  | (4,636) | ​
Derivative adjustments | ​ |  | (14) | ​ |  | 680 | ​
Income tax (benefit) expense | ​ |  | (3) | ​ |  | 143 | ​
Net of income taxes | ​ |  | (11) | ​ |  | 537 | ​
Accumulated other comprehensive loss | ​ | $ | (46,574) | ​ | $ | (5,514) | ​

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