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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2024
Stockholders' Equity Note [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) | A roll-forward of the components of Accumulated Other Comprehensive Income (Loss) is presented in the table that follows:
﻿ | Available for Sale Securities |  | HTM Securities Transferred from AFS |  | Employee Benefit Plans |  | Cash Flow Hedges |  | Equity Method Investment |  | Total |
($ in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2022 | $ | (584,408 | ) | $ | (10,734 | ) | $ | (97,952 | ) | $ | (79,093 | ) | $ | 5 |  | $ | (772,182 | )
Net change in unrealized gain |  | 80,958 |  |  | — |  |  | — |  |  | 19,280 |  |  | 706 |  |  | 100,944 |
Reclassification of net loss realized and included in earnings |  | — |  |  | — |  |  | 1,519 |  |  | 8,001 |  |  | — |  |  | 9,520 |
Valuation adjustments to employee benefit plans |  | — |  |  | — |  |  | (1,836 | ) |  | — |  |  | — |  |  | (1,836 | )
Amortization of unrealized net gain or loss on securities transferred to HTM |  | — |  |  | 494 |  |  | — |  |  | — |  |  | — |  |  | 494 |
Income tax (expense) benefit |  | (18,224 | ) |  | (111 | ) |  | 71 |  |  | (6,141 | ) |  | — |  |  | (24,405 | )
Balance, March 31, 2023 | $ | (521,674 | ) | $ | (10,351 | ) | $ | (98,198 | ) | $ | (57,953 | ) | $ | 711 |  | $ | (687,465 | )
Balance, December 31, 2023 | $ | (450,748 | ) | $ | (9,385 | ) | $ | (103,061 | ) | $ | (58,306 | ) | $ | 373 |  | $ | (621,127 | )
Net change in unrealized gain (loss) |  | (48,264 | ) |  | — |  |  | — |  |  | (29,191 | ) |  | (344 | ) |  | (77,799 | )
Reclassification of net loss realized and included in earnings |  | — |  |  | — |  |  | 1,019 |  |  | 12,558 |  |  | — |  |  | 13,577 |
Valuation adjustments to employee benefit plans |  | — |  |  | — |  |  | 22,014 |  |  | — |  |  | — |  |  | 22,014 |
Amortization of unrealized net loss on securities transferred to HTM |  | — |  |  | 428 |  |  | — |  |  | — |  |  | — |  |  | 428 |
Income tax (expense) benefit |  | 10,927 |  |  | (96 | ) |  | (5,176 | ) |  | 3,737 |  |  | — |  |  | 9,392 |
Balance, March 31, 2024 | $ | (488,085 | ) | $ | (9,053 | ) | $ | (85,204 | ) | $ | (71,202 | ) | $ | 29 |  | $ | (653,515 | )
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, |  |  | Affected line item on
($ in thousands) |  | 2024 |  |  | 2023 |  |  | the statement of income
Amortization of unrealized net loss on securities transferred to HTM |  | $ | (428 | ) |  | $ | (494 | ) |  | Interest income
Tax effect |  |  | 96 |  |  |  | 111 |  |  | Income taxes
Net of tax |  |  | (332 | ) |  |  | (383 | ) |  | Net income
Amortization of defined benefit pension and post-retirement items |  |  | (1,019 | ) |  |  | (1,519 | ) |  | Other noninterest expense (b)
Tax effect |  |  | 229 |  |  |  | 340 |  |  | Income taxes
Net of tax |  |  | (790 | ) |  |  | (1,179 | ) |  | Net income
Reclassification of unrealized gain (loss) on cash flow hedges |  |  | (12,658 | ) |  |  | (10,629 | ) |  | Interest income
Tax effect |  |  | 2,844 |  |  |  | 2,393 |  |  | Income taxes
Net of tax |  |  | (9,814 | ) |  |  | (8,236 | ) |  | Net income
Amortization of gain on terminated cash flow hedges |  |  | 100 |  |  |  | 2,628 |  |  | Interest income
Tax effect |  |  | (22 | ) |  |  | (592 | ) |  | Income taxes
Net of tax |  |  | 78 |  |  |  | 2,036 |  |  | Net income
Total reclassifications, net of tax |  | $ | (10,858 | ) |  | $ | (7,762 | ) |  | 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 11 – Retirement Plans for additional details).

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