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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 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 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)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at March 31, 2023 | ​ | $ | (834,206) | ​ | $ | 222,527 | ​ | $ | (611,679)
Three months ended June 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (14,025) | ​ | ​ | 3,741 | ​ | ​ | (10,284)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 13,064 | ​ | ​ | (3,485) | ​ | ​ | 9,579
Net change in investment securities | ​ | ​ | (961) | ​ | ​ | 256 | ​ | ​ | (705)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (2,053) | ​ | ​ | 548 | ​ | ​ | (1,505)
Reclassification of net losses included in net income | ​ | ​ | 1,573 | ​ | ​ | (420) | ​ | ​ | 1,153
Net change in cash flow derivative hedges | ​ | ​ | (480) | ​ | ​ | 128 | ​ | ​ | (352)
Other comprehensive loss | ​ | ​ | (1,441) | ​ | ​ | 384 | ​ | ​ | (1,057)
Accumulated other comprehensive loss at June 30, 2023 | ​ | $ | (835,647) | ​ | $ | 222,911 | ​ | $ | (612,736)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
Six months ended June 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 11,013 | ​ | ​ | (2,938) | ​ | ​ | 8,075
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 24,772 | ​ | ​ | (6,608) | ​ | ​ | 18,164
Net change in investment securities | ​ | ​ | 35,785 | ​ | ​ | (9,546) | ​ | ​ | 26,239
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (2,495) | ​ | ​ | 665 | ​ | ​ | (1,830)
Reclassification of net losses included in net income | ​ | ​ | 2,876 | ​ | ​ | (767) | ​ | ​ | 2,109
Net change in cash flow derivative hedges | ​ | ​ | 381 | ​ | ​ | (102) | ​ | ​ | 279
Other comprehensive income | ​ | ​ | 36,166 | ​ | ​ | (9,648) | ​ | ​ | 26,518
Accumulated other comprehensive loss at June 30, 2023 | ​ | $ | (835,647) | ​ | $ | 222,911 | ​ | $ | (612,736)
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, 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)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended June 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (5,431) | ​ | $ | (273,816) | ​ | $ | (328,361) | ​ | $ | (4,071) | ​ | $ | (611,679)
Other comprehensive (loss) income | ​ | ​ | — | ​ | ​ | (10,284) | ​ | ​ | 9,579 | ​ | ​ | (352) | ​ | ​ | (1,057)
Balance at end of period | ​ | $ | (5,431) | ​ | $ | (284,100) | ​ | $ | (318,782) | ​ | $ | (4,423) | ​ | $ | (612,736)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (5,431) | ​ | $ | (292,175) | ​ | $ | (336,946) | ​ | $ | (4,702) | ​ | $ | (639,254)
Other comprehensive income | ​ | ​ | — | ​ | ​ | 8,075 | ​ | ​ | 18,164 | ​ | ​ | 279 | ​ | ​ | 26,518
Balance at end of period | ​ | $ | (5,431) | ​ | $ | (284,100) | ​ | $ | (318,782) | ​ | $ | (4,423) | ​ | $ | (612,736)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​

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