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Accumulated Other Comprehensive Loss | 6 Months Ended
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Jun. 30, 2025
Accumulated Other Comprehensive Loss |
Accumulated Other Comprehensive Loss | 9. Accumulated Other Comprehensive Loss ​ Accumulated other comprehensive loss is defined as the revenues, expenses, gains and losses that are included in comprehensive loss but excluded from net income. The Company’s significant items of accumulated other comprehensive loss are pension and other benefits, net unrealized gains or losses on investment securities and net unrealized gains or losses on cash flow derivative hedges. The Company utilizes a security-by-security approach to releasing income tax effects from accumulated other comprehensive loss. ​ Changes in accumulated other comprehensive loss for the three and six months ended June 30, 2025 and 2024 are presented below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
​ The following table summarizes changes in accumulated other comprehensive loss, net of tax, for the periods indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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