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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 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 March 31, 2025 | ​ | $ | (591,574) | ​ | $ | 157,805 | ​ | $ | (433,769)
Three months ended June 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 26,354 | ​ | ​ | (7,030) | ​ | ​ | 19,324
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 9,982 | ​ | ​ | (2,663) | ​ | ​ | 7,319
Net change in investment securities | ​ | ​ | 36,336 | ​ | ​ | (9,693) | ​ | ​ | 26,643
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 113 | ​ | ​ | (29) | ​ | ​ | 84
Amounts excluded from the assessment of hedge effectiveness | ​ | ​ | 47 | ​ | ​ | (13) | ​ | ​ | 34
Net change in cash flow derivative hedges | ​ | ​ | 160 | ​ | ​ | (42) | ​ | ​ | 118
Other comprehensive income | ​ | ​ | 36,496 | ​ | ​ | (9,735) | ​ | ​ | 26,761
Accumulated other comprehensive loss at June 30, 2025 | ​ | $ | (555,078) | ​ | $ | 148,070 | ​ | $ | (407,008)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
Six months ended June 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 57,717 | ​ | ​ | (15,395) | ​ | ​ | 42,322
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 19,639 | ​ | ​ | (5,239) | ​ | ​ | 14,400
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities gains, net | ​ | ​ | (37) | ​ | ​ | 10 | ​ | ​ | (27)
Net change in investment securities | ​ | ​ | 77,319 | ​ | ​ | (20,624) | ​ | ​ | 56,695
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 349 | ​ | ​ | (92) | ​ | ​ | 257
Amounts excluded from the assessment of hedge effectiveness | ​ | ​ | 47 | ​ | ​ | (13) | ​ | ​ | 34
Net change in cash flow derivative hedges | ​ | ​ | 396 | ​ | ​ | (105) | ​ | ​ | 291
Other comprehensive income | ​ | ​ | 77,715 | ​ | ​ | (20,729) | ​ | ​ | 56,986
Accumulated other comprehensive loss at June 30, 2025 | ​ | $ | (555,078) | ​ | $ | 148,070 | ​ | $ | (407,008)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at March 31, 2024 | ​ | $ | (714,330) | ​ | $ | 190,550 | ​ | $ | (523,780)
Three months ended June 30, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (4,277) | ​ | ​ | 1,141 | ​ | ​ | (3,136)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 10,665 | ​ | ​ | (2,845) | ​ | ​ | 7,820
Net change in investment securities | ​ | ​ | 6,388 | ​ | ​ | (1,704) | ​ | ​ | 4,684
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (113) | ​ | ​ | 31 | ​ | ​ | (82)
Reclassification of net losses included in net income | ​ | ​ | 63 | ​ | ​ | (17) | ​ | ​ | 46
Net change in cash flow derivative hedges | ​ | ​ | (50) | ​ | ​ | 14 | ​ | ​ | (36)
Other comprehensive income | ​ | ​ | 6,338 | ​ | ​ | (1,690) | ​ | ​ | 4,648
Accumulated other comprehensive loss at June 30, 2024 | ​ | $ | (707,992) | ​ | $ | 188,860 | ​ | $ | (519,132)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
Six months ended June 30, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (7,709) | ​ | ​ | 2,056 | ​ | ​ | (5,653)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 21,825 | ​ | ​ | (5,821) | ​ | ​ | 16,004
Net change in investment securities | ​ | ​ | 14,116 | ​ | ​ | (3,765) | ​ | ​ | 10,351
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (826) | ​ | ​ | 220 | ​ | ​ | (606)
Reclassification of net losses included in net income | ​ | ​ | 1,818 | ​ | ​ | (485) | ​ | ​ | 1,333
Net change in cash flow derivative hedges | ​ | ​ | 992 | ​ | ​ | (265) | ​ | ​ | 727
Other comprehensive income | ​ | ​ | 15,108 | ​ | ​ | (4,030) | ​ | ​ | 11,078
Accumulated other comprehensive loss at June 30, 2024 | ​ | $ | (707,992) | ​ | $ | 188,860 | ​ | $ | (519,132)
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 June 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (1,879) | ​ | $ | (170,558) | ​ | $ | (261,420) | ​ | $ | 88 | ​ | $ | (433,769)
Other comprehensive income | ​ | ​ | — | ​ | ​ | 19,324 | ​ | ​ | 7,319 | ​ | ​ | 118 | ​ | ​ | 26,761
Balance at end of period | ​ | $ | (1,879) | ​ | $ | (151,234) | ​ | $ | (254,101) | ​ | $ | 206 | ​ | $ | (407,008)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (1,879) | ​ | $ | (193,529) | ​ | $ | (268,501) | ​ | $ | (85) | ​ | $ | (463,994)
Other comprehensive income | ​ | ​ | — | ​ | ​ | 42,295 | ​ | ​ | 14,400 | ​ | ​ | 291 | ​ | ​ | 56,986
Balance at end of period | ​ | $ | (1,879) | ​ | $ | (151,234) | ​ | $ | (254,101) | ​ | $ | 206 | ​ | $ | (407,008)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended June 30, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (5,373) | ​ | $ | (224,940) | ​ | $ | (293,427) | ​ | $ | (40) | ​ | $ | (523,780)
Other comprehensive (loss) income | ​ | ​ | — | ​ | ​ | (3,136) | ​ | ​ | 7,820 | ​ | ​ | (36) | ​ | ​ | 4,648
Balance at end of period | ​ | $ | (5,373) | ​ | $ | (228,076) | ​ | $ | (285,607) | ​ | $ | (76) | ​ | $ | (519,132)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (5,373) | ​ | $ | (222,423) | ​ | $ | (301,611) | ​ | $ | (803) | ​ | $ | (530,210)
Other comprehensive (loss) income | ​ | ​ | — | ​ | ​ | (5,653) | ​ | ​ | 16,004 | ​ | ​ | 727 | ​ | ​ | 11,078
Balance at end of period | ​ | $ | (5,373) | ​ | $ | (228,076) | ​ | $ | (285,607) | ​ | $ | (76) | ​ | $ | (519,132)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​

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