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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2025
AOCI Attributable to Parent [Abstract] |
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 December 31, 2024 | ​ | $ | (632,793) | ​ | $ | 168,799 | ​ | $ | (463,994)
Three months ended March 31, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 31,363 | ​ | ​ | (8,365) | ​ | ​ | 22,998
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 9,657 | ​ | ​ | (2,576) | ​ | ​ | 7,081
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities gains, net | ​ | ​ | (37) | ​ | ​ | 10 | ​ | ​ | (27)
Net change in investment securities | ​ | ​ | 40,983 | ​ | ​ | (10,931) | ​ | ​ | 30,052
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 236 | ​ | ​ | (63) | ​ | ​ | 173
Net change in cash flow derivative hedges | ​ | ​ | 236 | ​ | ​ | (63) | ​ | ​ | 173
Other comprehensive income | ​ | ​ | 41,219 | ​ | ​ | (10,994) | ​ | ​ | 30,225
Accumulated other comprehensive loss at March 31, 2025 | ​ | $ | (591,574) | ​ | $ | 157,805 | ​ | $ | (433,769)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
Three months ended March 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (3,432) | ​ | ​ | 915 | ​ | ​ | (2,517)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 11,160 | ​ | ​ | (2,976) | ​ | ​ | 8,184
Net change in investment securities | ​ | ​ | 7,728 | ​ | ​ | (2,061) | ​ | ​ | 5,667
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (713) | ​ | ​ | 189 | ​ | ​ | (524)
Reclassification of net losses included in net income | ​ | ​ | 1,755 | ​ | ​ | (468) | ​ | ​ | 1,287
Net change in cash flow derivative hedges | ​ | ​ | 1,042 | ​ | ​ | (279) | ​ | ​ | 763
Other comprehensive income | ​ | ​ | 8,770 | ​ | ​ | (2,340) | ​ | ​ | 6,430
Accumulated other comprehensive loss at March 31, 2024 | ​ | $ | (714,330) | ​ | $ | 190,550 | ​ | $ | (523,780)
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 March 31, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (1,879) | ​ | $ | (193,529) | ​ | $ | (268,501) | ​ | $ | (85) | ​ | $ | (463,994)
Other comprehensive income | ​ | ​ | — | ​ | ​ | 22,971 | ​ | ​ | 7,081 | ​ | ​ | 173 | ​ | ​ | 30,225
Balance at end of period | ​ | $ | (1,879) | ​ | $ | (170,558) | ​ | $ | (261,420) | ​ | $ | 88 | ​ | $ | (433,769)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended March 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (5,373) | ​ | $ | (222,423) | ​ | $ | (301,611) | ​ | $ | (803) | ​ | $ | (530,210)
Other comprehensive (loss) income | ​ | ​ | — | ​ | ​ | (2,517) | ​ | ​ | 8,184 | ​ | ​ | 763 | ​ | ​ | 6,430
Balance at end of period | ​ | $ | (5,373) | ​ | $ | (224,940) | ​ | $ | (293,427) | ​ | $ | (40) | ​ | $ | (523,780)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​

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