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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2021 | $ | 11,037 |  | $ | 153 |  | $ | (80,946 | ) | $ | 16,284 |  | $ | (463 | ) | $ | (53,935 | )
Net change in unrealized gain (loss) |  | (844,250 | ) |  | — |  |  | — |  |  | (118,110 | ) |  | 468 |  |  | (961,892 | )
Reclassification of net income or loss realized and included in earnings |  | 1,707 |  |  | — |  |  | 1,963 |  |  | (14,519 | ) |  | — |  |  | (10,849 | )
Valuation adjustments to employee benefit plans |  | — |  |  | — |  |  | (8,397 | ) |  | — |  |  | — |  |  | (8,397 | )
Transfer of net unrealized loss from AFS to HTM securities portfolio |  | 15,405 |  |  | (15,405 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of unrealized net loss on securities transferred to HTM |  | — |  |  | 961 |  |  | — |  |  | — |  |  | — |  |  | 961 |
Income tax benefit |  | 186,685 |  |  | 3,260 |  |  | 1,452 |  |  | 29,934 |  |  | — |  |  | 221,331 |
Balance, September 30, 2022 | $ | (629,416 | ) | $ | (11,031 | ) | $ | (85,928 | ) | $ | (86,411 | ) | $ | 5 |  | $ | (812,781 | )
Balance, December 31, 2022 | $ | (584,408 | ) | $ | (10,734 | ) | $ | (97,952 | ) | $ | (79,093 | ) | $ | 5 |  | $ | (772,182 | )
Net change in unrealized gain (loss) |  | (142,980 | ) |  | — |  |  | — |  |  | (44,823 | ) |  | 714 |  |  | (187,089 | )
Reclassification of net loss realized and included in earnings |  | — |  |  | — |  |  | 5,010 |  |  | 28,609 |  |  | — |  |  | 33,619 |
Valuation adjustments to employee benefit plans |  | — |  |  | — |  |  | (7,307 | ) |  | — |  |  | — |  |  | (7,307 | )
Amortization of unrealized net loss on securities transferred to HTM |  | — |  |  | 1,343 |  |  | — |  |  | — |  |  | — |  |  | 1,343 |
Income tax (expense) benefit |  | 32,757 |  |  | (302 | ) |  | 517 |  |  | 3,650 |  |  | — |  |  | 36,622 |
Balance, September 30, 2023 | $ | (694,631 | ) | $ | (9,693 | ) | $ | (99,732 | ) | $ | (91,657 | ) | $ | 719 |  | $ | (894,994 | )
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) |  | 2023 |  |  | 2022 |  |  | the statement of income
Loss on sale of AFS securities |  | $ | — |  |  | $ | (1,707 | ) |  | Noninterest income
Tax effect |  |  | — |  |  |  | 385 |  |  | Income taxes
Net of tax |  |  | — |  |  |  | (1,322 | ) |  | Net income
Amortization of unrealized net loss on securities transferred to HTM |  |  | (1,343 | ) |  |  | (961 | ) |  | Interest income
Tax effect |  |  | 302 |  |  |  | 217 |  |  | Income taxes
Net of tax |  |  | (1,041 | ) |  |  | (744 | ) |  | Net income
Amortization of defined benefit pension and post-retirement items |  |  | (5,010 | ) |  |  | (1,963 | ) |  | Other noninterest expense (b)
Tax effect |  |  | 1,128 |  |  |  | 443 |  |  | Income taxes
Net of tax |  |  | (3,882 | ) |  |  | (1,520 | ) |  | Net income
Reclassification of unrealized gain (loss) on cash flow hedges |  |  | (34,506 | ) |  |  | 5,786 |  |  | Interest income
Tax effect |  |  | 7,768 |  |  |  | (1,306 | ) |  | Income taxes
Net of tax |  |  | (26,738 | ) |  |  | 4,480 |  |  | Net income
Amortization of gain on terminated cash flow hedges |  |  | 5,897 |  |  |  | 8,733 |  |  | Interest income
Tax effect |  |  | (1,327 | ) |  |  | (1,971 | ) |  | Income taxes
Net of tax |  |  | 4,570 |  |  |  | 6,762 |  |  | Net income
Total reclassifications, net of tax |  |  | (27,091 | ) |  |  | 7,656 |  |  | 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 10 – Retirement Plans for additional details).

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