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Other comprehensive loss (Tables) | 9 Months Ended
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Sep. 30, 2023
Other comprehensive loss |
Schedule of components of accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | ​ | September 30, 2023 |  | ​ | December 31, 2022 |
Net unrealized loss on investment securities available for sale | ​ | $ | (71,021) | ​ | $ | (66,250) | ​
Income tax benefit | ​ |  | (15,294) | ​ |  | (14,266) | ​
Net of income taxes | ​ |  | (55,727) | ​ |  | (51,984) | ​
Benefit plan adjustments | ​ |  | (5,499) | ​ |  | (5,499) | ​
Income tax benefit | ​ |  | (1,184) | ​ |  | (1,184) | ​
Net of income taxes | ​ |  | (4,315) | ​ |  | (4,315) | ​
Derivative adjustments | ​ |  | 779 | ​ |  | (47) | ​
Income tax expense (benefit) | ​ |  | 167 | ​ |  | (10) | ​
Net of income taxes | ​ |  | 612 | ​ |  | (37) | ​
Accumulated other comprehensive loss | ​ | $ | (59,430) | ​ | $ | (56,336) | ​
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