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Other comprehensive income (loss) (Tables) | 3 Months Ended
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Mar. 31, 2025
Other comprehensive income (loss) |
Schedule of components of accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | ​ | March 31, 2025 |  | ​ | December 31, 2024 |
Net unrealized loss on investment securities available for sale | ​ | $ | (43,387) | ​ | $ | (48,959) | ​
Income tax benefit | ​ |  | (9,465) | ​ |  | (10,681) | ​
Net of income taxes | ​ |  | (33,922) | ​ |  | (38,278) | ​
Benefit plan adjustments | ​ |  | (2,852) | ​ |  | (2,852) | ​
Income tax benefit | ​ |  | (622) | ​ |  | (622) | ​
Net of income taxes | ​ |  | (2,230) | ​ |  | (2,230) | ​
Derivative adjustments | ​ |  | (387) | ​ |  | (239) | ​
Income tax benefit | ​ |  | (85) | ​ |  | (52) | ​
Net of income taxes | ​ |  | (302) | ​ |  | (187) | ​
Accumulated other comprehensive loss | ​ | $ | (36,454) | ​ | $ | (40,695) | ​
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