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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2025
Stockholders' Equity Note [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) | A rollforward of the components of Accumulated Other Comprehensive Income (Loss) is presented in the table that follows:
($ in thousands) | Available for Sale Securities |  | HTM Securities Transferred from AFS |  | Employee Benefit Plans |  | Cash Flow Hedges |  | Equity Method Investment |  | Total |
Balance, December 31, 2024 | $ | (473,679 | ) | $ | (8,071 | ) | $ | (77,235 | ) | $ | (47,136 | ) | $ | 29 |  | $ | (606,092 | )
Net change in unrealized gain (loss) |  | 202,858 |  |  | — |  |  | — |  |  | 9,770 |  |  | 3,056 |  |  | 215,684 |
Reclassification of net loss realized and included in earnings |  | — |  |  | — |  |  | 2,623 |  |  | 26,174 |  |  | — |  |  | 28,797 |
Amortization of unrealized net loss on securities transferred to HTM |  | — |  |  | 1,205 |  |  | — |  |  | — |  |  | — |  |  | 1,205 |
Income tax expense |  | (46,822 | ) |  | (289 | ) |  | (759 | ) |  | (8,184 | ) |  | — |  |  | (56,054 | )
Balance, September 30, 2025 | $ | (317,643 | ) | $ | (7,155 | ) | $ | (75,371 | ) | $ | (19,376 | ) | $ | 3,085 |  | $ | (416,460 | )
Balance, December 31, 2023 | $ | (450,748 | ) | $ | (9,385 | ) | $ | (103,061 | ) | $ | (58,306 | ) | $ | 373 |  | $ | (621,127 | )
Net change in unrealized gain (loss) |  | 132,391 |  |  | — |  |  | — |  |  | (10,495 | ) |  | (344 | ) |  | 121,552 |
Reclassification of net loss realized and included in earnings |  | — |  |  | — |  |  | 3,569 |  |  | 38,120 |  |  | — |  |  | 41,689 |
Valuation adjustments to employee benefit plans |  | — |  |  | — |  |  | 22,014 |  |  | — |  |  | — |  |  | 22,014 |
Amortization of unrealized net loss on securities transferred to HTM |  | — |  |  | 1,279 |  |  | — |  |  | — |  |  | — |  |  | 1,279 |
Income tax (expense) benefit |  | (28,958 | ) |  | (268 | ) |  | (5,555 | ) |  | (6,122 | ) |  | — |  |  | (40,903 | )
Balance, September 30, 2024 | $ | (347,315 | ) | $ | (8,374 | ) | $ | (83,033 | ) | $ | (36,803 | ) | $ | 29 |  | $ | (475,496 | )
Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income | The following table shows the line items in the consolidated statements of income affected by amounts reclassified from AOCI.
|  | Nine Months Ended |  |  |
Amount reclassified from AOCI (a) |  | September 30, |  |  | Affected line item on
($ in thousands) |  | 2025 |  |  | 2024 |  |  | the statement of income
Amortization of unrealized net loss on securities transferred to HTM |  | $ | (1,205 | ) |  | $ | (1,279 | ) |  | Interest income
Tax effect |  |  | 289 |  |  |  | 268 |  |  | Income taxes
Net of tax |  |  | (916 | ) |  |  | (1,011 | ) |  | Net income
Amortization of defined benefit pension and post-retirement items |  |  | (2,623 | ) |  |  | (3,569 | ) |  | Other noninterest expense (b)
Tax effect |  |  | 759 |  |  |  | 775 |  |  | Income taxes
Net of tax |  |  | (1,864 | ) |  |  | (2,794 | ) |  | Net income
Reclassification of unrealized loss on cash flow hedges |  |  | (21,594 | ) |  |  | (37,257 | ) |  | Interest income
Tax effect |  |  | 4,917 |  |  |  | 8,257 |  |  | Income taxes
Net of tax |  |  | (16,677 | ) |  |  | (29,000 | ) |  | Net income
Amortization of loss on terminated cash flow hedges |  |  | (4,580 | ) |  |  | (863 | ) |  | Interest income
Tax effect |  |  | 1,043 |  |  |  | 191 |  |  | Income taxes
Net of tax |  |  | (3,537 | ) |  |  | (672 | ) |  | Net income
Total reclassifications, net of tax |  | $ | (22,994 | ) |  | $ | (33,477 | ) |  | Net income
(a) Amounts in parentheses indicate reduction in net income. (b) These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with other noninterest expense (see Note 13 – Retirement Plans for additional details).

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