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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2025
Accumulated Other Comprehensive Loss |
Schedule of changes in accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at June 30, 2025 | ​ | $ | (555,078) | ​ | $ | 148,070 | ​ | $ | (407,008)
Three months ended September 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 14,877 | ​ | ​ | (3,969) | ​ | ​ | 10,908
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 11,464 | ​ | ​ | (3,057) | ​ | ​ | 8,407
Net change in investment securities | ​ | ​ | 26,341 | ​ | ​ | (7,026) | ​ | ​ | 19,315
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (156) | ​ | ​ | 40 | ​ | ​ | (116)
Amounts excluded from the assessment of hedge effectiveness | ​ | ​ | (467) | ​ | ​ | 127 | ​ | ​ | (340)
Net change in cash flow derivative hedges | ​ | ​ | (623) | ​ | ​ | 167 | ​ | ​ | (456)
Other comprehensive income | ​ | ​ | 25,718 | ​ | ​ | (6,859) | ​ | ​ | 18,859
Accumulated other comprehensive loss at September 30, 2025 | ​ | $ | (529,360) | ​ | $ | 141,211 | ​ | $ | (388,149)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at December 31, 2024 | ​ | $ | (632,793) | ​ | $ | 168,799 | ​ | $ | (463,994)
Nine months ended September 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 72,594 | ​ | ​ | (19,364) | ​ | ​ | 53,230
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 31,103 | ​ | ​ | (8,296) | ​ | ​ | 22,807
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities gains, net | ​ | ​ | (37) | ​ | ​ | 10 | ​ | ​ | (27)
Net change in investment securities | ​ | ​ | 103,660 | ​ | ​ | (27,650) | ​ | ​ | 76,010
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 193 | ​ | ​ | (53) | ​ | ​ | 140
Amounts excluded from the assessment of hedge effectiveness | ​ | ​ | (420) | ​ | ​ | 115 | ​ | ​ | (305)
Net change in cash flow derivative hedges | ​ | ​ | (227) | ​ | ​ | 62 | ​ | ​ | (165)
Other comprehensive income | ​ | ​ | 103,433 | ​ | ​ | (27,588) | ​ | ​ | 75,845
Accumulated other comprehensive loss at September 30, 2025 | ​ | $ | (529,360) | ​ | $ | 141,211 | ​ | $ | (388,149)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at June 30, 2024 | ​ | $ | (707,992) | ​ | $ | 188,860 | ​ | $ | (519,132)
Three months ended September 30, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 76,226 | ​ | ​ | (20,333) | ​ | ​ | 55,893
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 13,922 | ​ | ​ | (3,714) | ​ | ​ | 10,208
Net change in investment securities | ​ | ​ | 90,148 | ​ | ​ | (24,047) | ​ | ​ | 66,101
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 501 | ​ | ​ | (133) | ​ | ​ | 368
Reclassification of net losses included in net income | ​ | ​ | 7 | ​ | ​ | (2) | ​ | ​ | 5
Net change in cash flow derivative hedges | ​ | ​ | 508 | ​ | ​ | (135) | ​ | ​ | 373
Other comprehensive income | ​ | ​ | 90,656 | ​ | ​ | (24,182) | ​ | ​ | 66,474
Accumulated other comprehensive loss at September 30, 2024 | ​ | $ | (617,336) | ​ | $ | 164,678 | ​ | $ | (452,658)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at December 31, 2023 | ​ | $ | (723,100) | ​ | $ | 192,890 | ​ | $ | (530,210)
Nine months ended September 30, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 68,517 | ​ | ​ | (18,277) | ​ | ​ | 50,240
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 35,747 | ​ | ​ | (9,535) | ​ | ​ | 26,212
Net change in investment securities | ​ | ​ | 104,264 | ​ | ​ | (27,812) | ​ | ​ | 76,452
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (325) | ​ | ​ | 87 | ​ | ​ | (238)
Reclassification of net losses included in net income | ​ | ​ | 1,825 | ​ | ​ | (487) | ​ | ​ | 1,338
Net change in cash flow derivative hedges | ​ | ​ | 1,500 | ​ | ​ | (400) | ​ | ​ | 1,100
Other comprehensive income | ​ | ​ | 105,764 | ​ | ​ | (28,212) | ​ | ​ | 77,552
Accumulated other comprehensive loss at September 30, 2024 | ​ | $ | (617,336) | ​ | $ | 164,678 | ​ | $ | (452,658)
Summary of changes in accumulated other comprehensive loss, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pensions | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | and | ​ | Available-for-Sale | ​ | Held-to-Maturity | ​ | Cash Flow | ​ | Other
​ | ​ | Other | ​ | Investment | ​ | Investment | ​ | Derivative | ​ | Comprehensive
(dollars in thousands) |  | Benefits |  | Securities |  | Securities |  | Hedges |  | Loss
Three Months Ended September 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (1,879) | ​ | $ | (151,234) | ​ | $ | (254,101) | ​ | $ | 206 | ​ | $ | (407,008)
Other comprehensive income (loss) | ​ | ​ | — | ​ | ​ | 10,908 | ​ | ​ | 8,407 | ​ | ​ | (456) | ​ | ​ | 18,859
Balance at end of period | ​ | $ | (1,879) | ​ | $ | (140,326) | ​ | $ | (245,694) | ​ | $ | (250) | ​ | $ | (388,149)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (1,879) | ​ | $ | (193,529) | ​ | $ | (268,501) | ​ | $ | (85) | ​ | $ | (463,994)
Other comprehensive income (loss) | ​ | ​ | — | ​ | ​ | 53,203 | ​ | ​ | 22,807 | ​ | ​ | (165) | ​ | ​ | 75,845
Balance at end of period | ​ | $ | (1,879) | ​ | $ | (140,326) | ​ | $ | (245,694) | ​ | $ | (250) | ​ | $ | (388,149)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (5,373) | ​ | $ | (228,076) | ​ | $ | (285,607) | ​ | $ | (76) | ​ | $ | (519,132)
Other comprehensive income | ​ | ​ | — | ​ | ​ | 55,893 | ​ | ​ | 10,208 | ​ | ​ | 373 | ​ | ​ | 66,474
Balance at end of period | ​ | $ | (5,373) | ​ | $ | (172,183) | ​ | $ | (275,399) | ​ | $ | 297 | ​ | $ | (452,658)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (5,373) | ​ | $ | (222,423) | ​ | $ | (301,611) | ​ | $ | (803) | ​ | $ | (530,210)
Other comprehensive income | ​ | ​ | — | ​ | ​ | 50,240 | ​ | ​ | 26,212 | ​ | ​ | 1,100 | ​ | ​ | 77,552
Balance at end of period | ​ | $ | (5,373) | ​ | $ | (172,183) | ​ | $ | (275,399) | ​ | $ | 297 | ​ | $ | (452,658)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​

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