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Other comprehensive loss (Tables) | 3 Months Ended
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Mar. 31, 2024
Other comprehensive (loss) income |
Schedule of components of accumulated other comprehensive (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | ​ | March 31, 2024 |  | ​ | December 31, 2023 |
Net unrealized loss on investment securities available for sale | ​ | $ | (53,968) | ​ | $ | (51,527) | ​
Income tax benefit | ​ |  | (11,804) | ​ |  | (11,270) | ​
Net of income taxes | ​ |  | (42,164) | ​ |  | (40,257) | ​
Benefit plan adjustments | ​ |  | (4,370) | ​ |  | (4,370) | ​
Income tax benefit | ​ |  | (956) | ​ |  | (956) | ​
Net of income taxes | ​ |  | (3,414) | ​ |  | (3,414) | ​
Derivative adjustments | ​ |  | 208 | ​ |  | (871) | ​
Income tax expense (benefit) | ​ |  | 45 | ​ |  | (191) | ​
Net of income taxes | ​ |  | 163 | ​ |  | (680) | ​
Accumulated other comprehensive loss | ​ | $ | (45,415) | ​ | $ | (44,351) | ​
​

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