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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at June 30, 2024 | ​ | $ | 627 | ​ | $ | (620,838) | ​ | $ | (620,211)
Other comprehensive income before reclassifications | ​ |  | — | ​ |  | 140,571 | ​ |  | 140,571
Net comprehensive income | ​ |  | — | ​ |  | 140,571 | ​ |  | 140,571
Balance at September 30, 2024 | ​ | $ | 627 | ​ | $ | (480,267) | ​ | $ | (479,640)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at June 30, 2023 | ​ | $ | (673) | ​ | $ | (661,725) | ​ | $ | (662,398)
Other comprehensive loss before reclassifications | ​ |  | — | ​ |  | (153,491) | ​ | ​ | (153,491)
Net comprehensive loss | ​ |  | — | ​ |  | (153,491) | ​ |  | (153,491)
Balance at September 30, 2023 | ​ | $ | (673) | ​ | $ | (815,216) | ​ | $ | (815,889)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2023 | ​ | $ | 627 | ​ | $ | (583,163) | ​ | $ | (582,536)
Other comprehensive income before reclassifications | ​ | ​ | — | ​ | ​ | 102,896 | ​ | ​ | 102,896
Net comprehensive income | ​ |  | — | ​ |  | 102,896 | ​ |  | 102,896
Balance at September 30, 2024 | ​ | $ | 627 | ​ | $ | (480,267) | ​ | $ | (479,640)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2022 | ​ | $ | (673) | ​ | $ | (676,415) | ​ | $ | (677,088)
Other comprehensive loss before reclassifications | ​ |  | — | ​ |  | (138,768) | ​ |  | (138,768)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | (33) | ​ |  | (33)
Net comprehensive loss | ​ |  | — | ​ |  | (138,801) | ​ |  | (138,801)
Balance at September 30, 2023 | ​ | $ | (673) | ​ | $ | (815,216) | ​ | $ | (815,889)
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 September 30, | ​ | For the Nine Months Ended September 30, | ​ | ​
Accumulated Other Comprehensive Income (Loss) Component |  | 2024 |  | 2023 |  | 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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