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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss) |
Schedule of components of accumulated other comprehensive loss, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized Losses | ​ | ​ | ​ |
​ | ​ | Benefit | ​ | on Securities | ​ | ​ | ​ |
(Dollars in thousands) | ​ | Plans | ​ | Available for Sale | ​ | Total |
Three Months Ended September 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at June 30, 2025 | ​ | $ | 578 | ​ | $ | (372,687) | ​ | $ | (372,109) | ​
Other comprehensive income before reclassifications | ​ |  | — | ​ |  | 56,097 | ​ |  | 56,097 | ​
Net comprehensive income | ​ |  | — | ​ |  | 56,097 | ​ |  | 56,097 | ​
Balance at September 30, 2025 | ​ | $ | 578 | ​ | $ | (316,590) | ​ | $ | (316,012) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2024 | ​ | $ | 578 | ​ | $ | (607,499) | ​ | $ | (606,921) | ​
Other comprehensive income before reclassifications | ​ | ​ | — | ​ | ​ | 117,241 | ​ | ​ | 117,241 | ​
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | 173,668 | ​ |  | 173,668 | ​
Net comprehensive income | ​ |  | — | ​ |  | 290,909 | ​ |  | 290,909 | ​
Balance at September 30, 2025 | ​ | $ | 578 | ​ | $ | (316,590) | ​ | $ | (316,012) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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) | ​
Schedule of reclassifications out of accumulated other comprehensive loss, 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 Loss Component |  | 2025 |  | 2024 |  | 2025 |  | 2024 |  | Income Statement Line Item Affected |
Loss on sale of available for sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | — | ​ | $ | — | ​ | $ | 228,811 | ​ | $ | — | ​ | Securities losses, net | ​
​ | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (55,143) | ​ | ​ | — | ​ | Provision for income taxes | ​
​ | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 173,668 | ​ | ​ | — | ​ | Net income | ​
Total reclassifications for the period | ​ | $ | — | ​ | $ | — | ​ | $ | 173,668 | ​ | $ | — | ​ | ​ | ​
​

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