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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2026
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | 7. Stockholders’ Equity Common Shares Outstanding Common shares outstanding excludes treasury shares totaling 11.8 million and 10.7 million at March 31, 2026 and December 31, 2025, respectively, with a first-in-first-out cost basis of $591.1 million and $502.9 million at March 31, 2026 and December 31, 2025, respectively. Shares outstanding also excludes unvested restricted share awards totaling 7,280 at March 31, 2026 and 8,520 at December 31, 2025. Stock Buyback Programs On December 10, 2025, the Company’s Board of Directors approved a stock buyback program, effective January 1, 2026, whereby the Company is authorized to repurchase up to 5% of the shares of the Company's common stock outstanding as of December 31, 2025, or approximately 4.1 million shares, through the program’s expiration date of December 31, 2026. The program allows the Company to repurchase its common shares in the open market, by block purchase, through accelerated share repurchase programs, in privately negotiated transactions, or otherwise, in one or more transactions, from time to time, depending on market conditions and other factors, and in accordance with applicable regulations of the Securities and Exchange Commission. The Company is not obligated to purchase any shares under this program, and the Board of Directors has the ability to terminate or amend the program at any time prior to the expiration date. During the three months ended March 31, 2026, the Company repurchased 1.4 million shares of its common stock at an average cost of $67.58 per share, inclusive of commissions, under this program. The Company has accrued $0.8 million of estimated excise tax associated with share repurchases during the three months ended March 31, 2026. Prior to its completion in December 2025, the Company had in place a stock repurchase program authorized by the Board of Directors on December 9, 2024, whereby the Company was authorized to repurchase up to 5% of the Company's common stock outstanding at December 31, 2024, or approximately 4.3 million shares, with the same terms described above through the program's expiration date of December 31, 2026. During the three months ended March 31, 2025, the Company repurchased 350,000 shares under this program, at an average cost of $59.28 per share, inclusive of commissions. Accumulated Other Comprehensive Income (Loss) A rollforward of the components of Accumulated Other Comprehensive Income (Loss) is presented in the table that follows:
($ 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 | )
Accumulated Other Comprehensive Income or Loss (“AOCI”) is reported as a component of stockholders’ equity. AOCI can include, among other items, unrealized holding gains and losses on securities available for sale (“AFS”), including the Company’s share of unrealized gains and losses reported by a partnership accounted for under the equity method, gains and losses associated with pension or other post-retirement benefits that are not recognized immediately as a component of net periodic benefit cost, and gains and losses on derivative instruments that are designated as, and qualify as, cash flow hedges. Net unrealized gains and losses on AFS securities reclassified as securities held to maturity (“HTM”) also continue to be reported as a component of AOCI and will be amortized over the estimated remaining life of the securities as an adjustment to interest income. Subject to certain thresholds, unrealized losses on employee benefit plans will be reclassified into income as pension and post-retirement costs are recognized over the remaining service period of plan participants. Accumulated gains or losses on cash flow hedges of variable rate loans described in Note 6 - Derivatives will be reclassified into income over the life of the hedge. Accumulated other comprehensive loss resulting from terminated interest rate swaps are being amortized over the remaining maturities of the designated instruments. Gains and losses within AOCI are net of deferred income taxes, where applicable. 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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