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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2024
Accumulated Other Comprehensive Income (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 December 31, 2023 | ​ | $ | (723,100) | ​ | $ | 192,890 | ​ | $ | (530,210)
Year ended December 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pension and other benefits: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial gains arising during the year | ​ | ​ | 3,939 | ​ | ​ | (1,051) | ​ | ​ | 2,888
Amortization of net loss included in net income | ​ | ​ | 826 | ​ | ​ | (220) | ​ | ​ | 606
Net change in pension and other benefits | ​ | ​ | 4,765 | ​ | ​ | (1,271) | ​ | ​ | 3,494
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the year | ​ | ​ | 13,236 | ​ | ​ | (3,532) | ​ | ​ | 9,704
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 45,155 | ​ | ​ | (12,045) | ​ | ​ | 33,110
Investment securities losses, net | ​ | ​ | 26,171 | ​ | ​ | (6,981) | ​ | ​ | 19,190
Net change in investment securities | ​ | ​ | 84,562 | ​ | ​ | (22,558) | ​ | ​ | 62,004
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the year | ​ | ​ | (845) | ​ | ​ | 225 | ​ | ​ | (620)
Reclassification of net losses included in net income | ​ | ​ | 1,825 | ​ | ​ | (487) | ​ | ​ | 1,338
Net change in cash flow derivative hedges | ​ | ​ | 980 | ​ | ​ | (262) | ​ | ​ | 718
Other comprehensive income | ​ | ​ | 90,307 | ​ | ​ | (24,091) | ​ | ​ | 66,216
Accumulated other comprehensive loss at December 31, 2024 | ​ | $ | (632,793) | ​ | $ | 168,799 | ​ | $ | (463,994)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
Year ended December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pension and other benefits: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial losses arising during the year | ​ | ​ | (1,063) | ​ | ​ | 284 | ​ | ​ | (779)
Amortization of net loss included in net income | ​ | ​ | 1,142 | ​ | ​ | (305) | ​ | ​ | 837
Net change in pension and other benefits | ​ | ​ | 79 | ​ | ​ | (21) | ​ | ​ | 58
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the year | ​ | ​ | 55,141 | ​ | ​ | (14,709) | ​ | ​ | 40,432
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 48,190 | ​ | ​ | (12,855) | ​ | ​ | 35,335
Investment securities losses, net | ​ | ​ | 39,986 | ​ | ​ | (10,666) | ​ | ​ | 29,320
Net change in investment securities | ​ | ​ | 143,317 | ​ | ​ | (38,230) | ​ | ​ | 105,087
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the year | ​ | ​ | (940) | ​ | ​ | 251 | ​ | ​ | (689)
Reclassification of net losses included in net income | ​ | ​ | 6,257 | ​ | ​ | (1,669) | ​ | ​ | 4,588
Net change in cash flow derivative hedges | ​ | ​ | 5,317 | ​ | ​ | (1,418) | ​ | ​ | 3,899
Other comprehensive income | ​ | ​ | 148,713 | ​ | ​ | (39,669) | ​ | ​ | 109,044
Accumulated other comprehensive loss at December 31, 2023 | ​ | $ | (723,100) | ​ | $ | 192,890 | ​ | $ | (530,210)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at December 31, 2021 | ​ | $ | (165,967) | ​ | $ | 44,274 | ​ | $ | (121,693)
Year ended December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pension and other benefits: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial gains arising during the year | ​ | ​ | 20,710 | ​ | ​ | (5,524) | ​ | ​ | 15,186
Amortization of net loss included in net income | ​ | ​ | 5,146 | ​ | ​ | (1,373) | ​ | ​ | 3,773
Net change in pension and other benefits | ​ | ​ | 25,856 | ​ | ​ | (6,897) | ​ | ​ | 18,959
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the year | ​ | ​ | (773,667) | ​ | ​ | 206,376 | ​ | ​ | (567,291)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 48,378 | ​ | ​ | (12,905) | ​ | ​ | 35,473
Net change in investment securities | ​ | ​ | (725,289) | ​ | ​ | 193,471 | ​ | ​ | (531,818)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the year | ​ | ​ | (6,710) | ​ | ​ | 1,790 | ​ | ​ | (4,920)
Reclassification of net losses included in net income: | ​ | ​ | 297 | ​ | ​ | (79) | ​ | ​ | 218
Net change in cash flow derivative hedges | ​ | ​ | (6,413) | ​ | ​ | 1,711 | ​ | ​ | (4,702)
Other comprehensive loss | ​ | ​ | (705,846) | ​ | ​ | 188,285 | ​ | ​ | (517,561)
Accumulated other comprehensive loss at December 31, 2022 | ​ | $ | (871,813) | ​ | $ | 232,559 | ​ | $ | (639,254)
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 |  | Income (Loss)
Year Ended December 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of year | ​ | $ | (5,373) | ​ | $ | (222,423) | ​ | $ | (301,611) | ​ | $ | (803) | ​ | $ | (530,210)
Other comprehensive income | ​ | ​ | 3,494 | ​ | ​ | 28,894 | ​ | ​ | 33,110 | ​ | ​ | 718 | ​ | ​ | 66,216
Balance at end of year | ​ | $ | (1,879) | ​ | $ | (193,529) | ​ | $ | (268,501) | ​ | $ | (85) | ​ | $ | (463,994)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Ended December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of year | ​ | $ | (5,431) | ​ | $ | (292,175) | ​ | $ | (336,946) | ​ | $ | (4,702) | ​ | $ | (639,254)
Other comprehensive income | ​ | ​ | 58 | ​ | ​ | 69,752 | ​ | ​ | 35,335 | ​ | ​ | 3,899 | ​ | ​ | 109,044
Balance at end of year | ​ | $ | (5,373) | ​ | $ | (222,423) | ​ | $ | (301,611) | ​ | $ | (803) | ​ | $ | (530,210)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Ended December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of year | ​ | $ | (24,390) | ​ | $ | (97,303) | ​ | $ | — | ​ | $ | — | ​ | $ | (121,693)
Unrealized net losses related to the transfer of securities from available-for-sale to held-to-maturity | ​ | ​ | — | ​ | ​ | 372,419 | ​ | ​ | (372,419) | ​ | ​ | — | ​ | ​ | —
Other comprehensive income (loss) | ​ | ​ | 18,959 | ​ | ​ | (567,291) | ​ | ​ | 35,473 | ​ | ​ | (4,702) | ​ | ​ | (517,561)
Balance at end of year | ​ | $ | (5,431) | ​ | $ | (292,175) | ​ | $ | (336,946) | ​ | $ | (4,702) | ​ | $ | (639,254)

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