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Accumulated Other Comprehensive Loss | 3 Months Ended
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Mar. 31, 2025
AOCI Attributable to Parent [Abstract] |
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 months ended March 31, 2025 and 2024 are presented below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
​ 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 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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- 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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