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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) |
Schedule of components of accumulated other comprehensive (loss) income, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized Losses | ​ | ​ | ​
​ | ​ | Benefit | ​ | on Securities | ​ | ​ | ​
(Dollars in thousands) | ​ | Plans | ​ | Available for Sale | ​ | Total
Three Months Ended March 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2023 | ​ | $ | 627 | ​ | $ | (583,163) | ​ | $ | (582,536)
Other comprehensive loss before reclassifications | ​ |  | — | ​ |  | (40,458) | ​ |  | (40,458)
Net comprehensive loss | ​ |  | — | ​ |  | (40,458) | ​ |  | (40,458)
Balance at March 31, 2024 | ​ | $ | 627 | ​ | $ | (623,621) | ​ | $ | (622,994)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended March 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2022 | ​ | $ | (673) | ​ | $ | (676,415) | ​ | $ | (677,088)
Other comprehensive income before reclassifications | ​ |  | — | ​ |  | 63,271 | ​ | ​ | 63,271
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | 33 | ​ |  | 33
Net comprehensive income | ​ |  | — | ​ |  | 63,304 | ​ |  | 63,304
Balance at March 31, 2023 | ​ | $ | (673) | ​ | $ | (613,111) | ​ | $ | (613,784)
Schedule of reclassifications out of accumulated other comprehensive income, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | ​ | ​
(Dollars in thousands) | ​ | For the Three Months Ended March 31, | ​ | ​
Accumulated Other Comprehensive Income (Loss) Component |  | 2024 |  | 2023 |  | Income Statement Line Item Affected
Gains on sales of available for sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | — | ​ | $ | 45 | ​ | Securities gains, net
​ | ​ | ​ | — | ​ | ​ | (12) | ​ | Provision for income taxes
​ | ​ | ​ | — | ​ | ​ | 33 | ​ | Net income
Total reclassifications for the period | ​ | $ | — | ​ | $ | 33 | ​ | ​
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