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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2024
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, 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)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at June 30, 2023 | ​ | $ | (835,647) | ​ | $ | 222,911 | ​ | $ | (612,736)
Three months ended September 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (61,874) | ​ | ​ | 16,505 | ​ | ​ | (45,369)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 11,434 | ​ | ​ | (3,050) | ​ | ​ | 8,384
Net change in investment securities | ​ | ​ | (50,440) | ​ | ​ | 13,455 | ​ | ​ | (36,985)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (373) | ​ | ​ | 100 | ​ | ​ | (273)
Reclassification of net losses included in net income | ​ | ​ | 1,723 | ​ | ​ | (460) | ​ | ​ | 1,263
Net change in cash flow derivative hedges | ​ | ​ | 1,350 | ​ | ​ | (360) | ​ | ​ | 990
Other comprehensive loss | ​ | ​ | (49,090) | ​ | ​ | 13,095 | ​ | ​ | (35,995)
Accumulated other comprehensive loss at September 30, 2023 | ​ | $ | (884,737) | ​ | $ | 236,006 | ​ | $ | (648,731)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at December 31, 2022 | ​ | $ | (871,813) | ​ | $ | 232,559 | ​ | $ | (639,254)
Nine months ended September 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (50,861) | ​ | ​ | 13,567 | ​ | ​ | (37,294)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 36,206 | ​ | ​ | (9,658) | ​ | ​ | 26,548
Net change in investment securities | ​ | ​ | (14,655) | ​ | ​ | 3,909 | ​ | ​ | (10,746)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (2,868) | ​ | ​ | 765 | ​ | ​ | (2,103)
Reclassification of net losses included in net income | ​ | ​ | 4,599 | ​ | ​ | (1,227) | ​ | ​ | 3,372
Net change in cash flow derivative hedges | ​ | ​ | 1,731 | ​ | ​ | (462) | ​ | ​ | 1,269
Other comprehensive loss | ​ | ​ | (12,924) | ​ | ​ | 3,447 | ​ | ​ | (9,477)
Accumulated other comprehensive loss at September 30, 2023 | ​ | $ | (884,737) | ​ | $ | 236,006 | ​ | $ | (648,731)
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, 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)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (5,431) | ​ | $ | (284,100) | ​ | $ | (318,782) | ​ | $ | (4,423) | ​ | $ | (612,736)
Other comprehensive (loss) income | ​ | ​ | — | ​ | ​ | (45,369) | ​ | ​ | 8,384 | ​ | ​ | 990 | ​ | ​ | (35,995)
Balance at end of period | ​ | $ | (5,431) | ​ | $ | (329,469) | ​ | $ | (310,398) | ​ | $ | (3,433) | ​ | $ | (648,731)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (5,431) | ​ | $ | (292,175) | ​ | $ | (336,946) | ​ | $ | (4,702) | ​ | $ | (639,254)
Other comprehensive (loss) income | ​ | ​ | — | ​ | ​ | (37,294) | ​ | ​ | 26,548 | ​ | ​ | 1,269 | ​ | ​ | (9,477)
Balance at end of period | ​ | $ | (5,431) | ​ | $ | (329,469) | ​ | $ | (310,398) | ​ | $ | (3,433) | ​ | $ | (648,731)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​

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