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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2026
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, 2025 | $ | (293,835 | ) | $ | (6,858 | ) | $ | (61,448 | ) | $ | (14,795 | ) | $ | 685 |  | $ | (376,251 | )
Net change in unrealized gain (loss) |  | (30,250 | ) |  | — |  |  | — |  |  | (8,098 | ) |  | (126 | ) |  | (38,474 | )
Reclassification of net loss realized and included in earnings |  | 98,595 |  |  | — |  |  | 17 |  |  | 5,980 |  |  | — |  |  | 104,592 |
Valuation adjustments to employee benefit plans |  | — |  |  | — |  |  | (496 | ) |  | — |  |  | — |  |  | (496 | )
Amortization of unrealized net loss on securities transferred to HTM |  | — |  |  | 413 |  |  | — |  |  | — |  |  | — |  |  | 413 |
Income tax (expense) benefit |  | (15,404 | ) |  | (93 | ) |  | 108 |  |  | 478 |  |  | — |  |  | (14,911 | )
Balance, March 31, 2026 | $ | (240,894 | ) | $ | (6,538 | ) | $ | (61,819 | ) | $ | (16,435 | ) | $ | 559 |  | $ | (325,127 | )
Balance, December 31, 2024 | $ | (473,679 | ) | $ | (8,071 | ) | $ | (77,235 | ) | $ | (47,136 | ) | $ | 29 |  | $ | (606,092 | )
Net change in unrealized gain (loss) |  | 102,125 |  |  | — |  |  | — |  |  | 7,560 |  |  | (173 | ) |  | 109,512 |
Reclassification of net loss realized and included in earnings |  | — |  |  | — |  |  | 955 |  |  | 8,460 |  |  | — |  |  | 9,415 |
Amortization of unrealized net loss on securities transferred to HTM |  | — |  |  | 405 |  |  | — |  |  | — |  |  | — |  |  | 405 |
Income tax expense |  | (24,014 | ) |  | (109 | ) |  | (384 | ) |  | (3,705 | ) |  | — |  |  | (28,212 | )
Balance, March 31, 2025 | $ | (395,568 | ) | $ | (7,775 | ) | $ | (76,664 | ) | $ | (34,821 | ) | $ | (144 | ) | $ | (514,972 | )
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.
|  | Three Months Ended |  |  |
Amount reclassified from AOCI (a) |  | March 31, |  |  | Income Statement
($ in thousands) |  | 2026 |  |  | 2025 |  |  | Line Item
Loss on sale of AFS securities |  | $ | (98,595 | ) |  | $ | — |  |  | Securities transactions, net
Tax effect |  |  | 22,222 |  |  |  | — |  |  | Income taxes
Net of tax |  |  | (76,373 | ) |  |  | — |  |  | Net income
Amortization of unrealized net loss on securities transferred to HTM |  |  | (413 | ) |  |  | (405 | ) |  | Interest income
Tax effect |  |  | 93 |  |  |  | 109 |  |  | Income taxes
Net of tax |  |  | (320 | ) |  |  | (296 | ) |  | Net income
Amortization of defined benefit pension and post-retirement items |  |  | (17 | ) |  |  | (955 | ) |  | Other noninterest expense (b)
Tax effect |  |  | 4 |  |  |  | 384 |  |  | Income taxes
Net of tax |  |  | (13 | ) |  |  | (571 | ) |  | Net income
Reclassification of unrealized loss on cash flow hedges |  |  | (4,470 | ) |  |  | (6,950 | ) |  | Interest income
Tax effect |  |  | 1,009 |  |  |  | 1,607 |  |  | Income taxes
Net of tax |  |  | (3,461 | ) |  |  | (5,343 | ) |  | Net income
Amortization of loss on terminated cash flow hedges |  |  | (1,510 | ) |  |  | (1,510 | ) |  | Interest income
Tax effect |  |  | 341 |  |  |  | 349 |  |  | Income taxes
Net of tax |  |  | (1,169 | ) |  |  | (1,161 | ) |  | Net income
Total reclassifications, net of tax |  | $ | (81,336 | ) |  | $ | (7,371 | ) |  | 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 12 – Retirement Plans for additional details).

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