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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2026
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 March 31, 2026 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2025 | ​ | $ | 565 | ​ | $ | (283,946) | ​ | $ | (283,381) | ​
Other comprehensive loss before reclassifications | ​ |  | — | ​ |  | (42,728) | ​ |  | (42,728) | ​
Net comprehensive loss | ​ |  | — | ​ |  | (42,728) | ​ |  | (42,728) | ​
Balance at March 31, 2026 | ​ | $ | 565 | ​ | $ | (326,674) | ​ | $ | (326,109) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended March 31, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2024 | ​ | $ | 578 | ​ | $ | (607,499) | ​ | $ | (606,921) | ​
Other comprehensive income before reclassifications | ​ |  | — | ​ |  | 56,586 | ​ | ​ | 56,586 | ​
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | 173,668 | ​ |  | 173,668 | ​
Net comprehensive income | ​ |  | — | ​ |  | 230,254 | ​ |  | 230,254 | ​
Balance at March 31, 2025 | ​ | $ | 578 | ​ | $ | (377,245) | ​ | $ | (376,667) | ​
Schedule of reclassifications out of accumulated other comprehensive loss, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Amount Reclassified from Other Comprehensive Income (Loss) | ​ | ​ | ​
(Dollars in thousands) | For the Three Months Ended March 31, | ​ | ​ |
Accumulated Other Comprehensive Loss Component | 2026 | ​ ​ ​ | 2025 | ​ ​ ​ | 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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