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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 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) |  | 146,860 |  |  | — |  |  | — |  |  | 11,096 |  |  | (173 | ) |  | 157,783 |
Reclassification of net loss realized and included in earnings |  | — |  |  | — |  |  | 1,888 |  |  | 17,195 |  |  | — |  |  | 19,083 |
Amortization of unrealized net loss on securities transferred to HTM |  | — |  |  | 792 |  |  | — |  |  | — |  |  | — |  |  | 792 |
Income tax expense |  | (34,140 | ) |  | (196 | ) |  | (594 | ) |  | (6,463 | ) |  | — |  |  | (41,393 | )
Balance, June 30, 2025 | $ | (360,959 | ) | $ | (7,475 | ) | $ | (75,941 | ) | $ | (25,308 | ) | $ | (144 | ) | $ | (469,827 | )
Balance, December 31, 2023 | $ | (450,748 | ) | $ | (9,385 | ) | $ | (103,061 | ) | $ | (58,306 | ) | $ | 373 |  | $ | (621,127 | )
Net change in unrealized gain (loss) |  | (59,111 | ) |  | — |  |  | — |  |  | (38,696 | ) |  | (344 | ) |  | (98,151 | )
Reclassification of net loss realized and included in earnings |  | — |  |  | — |  |  | 2,254 |  |  | 25,471 |  |  | — |  |  | 27,725 |
Valuation adjustments to employee benefit plans |  | — |  |  | — |  |  | 22,014 |  |  | — |  |  | — |  |  | 22,014 |
Amortization of unrealized net loss on securities transferred to HTM |  | — |  |  | 818 |  |  | — |  |  | — |  |  | — |  |  | 818 |
Income tax (expense) benefit |  | 13,450 |  |  | (184 | ) |  | (5,453 | ) |  | 2,972 |  |  | — |  |  | 10,785 |
Balance, June 30, 2024 | $ | (496,409 | ) | $ | (8,751 | ) | $ | (84,246 | ) | $ | (68,559 | ) | $ | 29 |  | $ | (657,936 | )
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.
﻿ |  | Six Months Ended |  |  |
Amount reclassified from AOCI (a) |  | June 30, |  |  | Affected line item on
($ in thousands) |  | 2025 |  |  | 2024 |  |  | the statement of income
Amortization of unrealized net loss on securities transferred to HTM |  | $ | (792 | ) |  | $ | (818 | ) |  | Interest income
Tax effect |  |  | 196 |  |  |  | 184 |  |  | Income taxes
Net of tax |  |  | (596 | ) |  |  | (634 | ) |  | Net income
Amortization of defined benefit pension and post-retirement items |  |  | (1,888 | ) |  |  | (2,254 | ) |  | Other noninterest expense (b)
Tax effect |  |  | 594 |  |  |  | 506 |  |  | Income taxes
Net of tax |  |  | (1,294 | ) |  |  | (1,748 | ) |  | Net income
Reclassification of unrealized loss on cash flow hedges |  |  | (14,159 | ) |  |  | (25,281 | ) |  | Interest income
Tax effect |  |  | 3,235 |  |  |  | 5,681 |  |  | Income taxes
Net of tax |  |  | (10,924 | ) |  |  | (19,600 | ) |  | Net income
Amortization of loss on terminated cash flow hedges |  |  | (3,036 | ) |  |  | (190 | ) |  | Interest income
Tax effect |  |  | 694 |  |  |  | 43 |  |  | Income taxes
Net of tax |  |  | (2,342 | ) |  |  | (147 | ) |  | Net income
Total reclassifications, net of tax |  | $ | (15,156 | ) |  | $ | (22,129 | ) |  | 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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