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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2023
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | 6. Stockholders’ Equity Common Shares Outstanding Common shares outstanding excludes treasury shares totaling 6.2 million and 6.3 million, with a first-in-first-out cost basis of $236.2 million and $238.6 million, at March 31, 2023 and December 31, 2022, respectively. Shares outstanding also excludes unvested restricted share awards totaling 0.6 million and 0.7 million at March 31, 2023 and December 31, 2022. Stock Buyback Program On January 26, 2023, the Company’s board of directors approved a stock buyback program whereby the Company is authorized to repurchase up to 4.3 million shares of its common stock through the program’s expiration date of December 31, 2024. 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. 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. To date, the Company has not repurchased shares under this program. Prior to its expiration on December 31, 2022, the Company had in place a stock repurchase program authorized by the board of directors on April 22, 2021, whereby the Company was authorized to repurchase up to 4.3 million shares of its common stock. The program allowed 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. During the first quarter of 2022, the Company repurchased 350,000 shares of its common stock at an average cost of $52.82 per share, inclusive of commissions. In total, the Company repurchased 1.7 million shares at an average cost of $48.77 per share under this plan. Accumulated Other Comprehensive Income (Loss) A roll-forward of the components of Accumulated Other Comprehensive Income (Loss) is presented in the table that follows:
﻿ | Available for Sale Securities |  | HTM Securities Transferred from AFS |  | Employee Benefit Plans |  | Cash Flow Hedges |  | Equity Method Investment |  | Total |
($ in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2021 | $ | 11,037 |  | $ | 153 |  | $ | (80,946 | ) | $ | 16,284 |  | $ | (463 | ) | $ | (53,935 | )
Net change in unrealized gain (loss) |  | (358,190 | ) |  | — |  |  | — |  |  | (33,182 | ) |  | 468 |  |  | (390,904 | )
Reclassification of net income or loss realized and included in earnings |  | 1,707 |  |  | — |  |  | 1,209 |  |  | (6,754 | ) |  | — |  |  | (3,838 | )
Transfer of net unrealized loss from AFS to HTM securities portfolio |  | 15,405 |  |  | (15,405 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of unrealized net gain on securities transferred to HTM |  | — |  |  | 261 |  |  | — |  |  | — |  |  | — |  |  | 261 |
Income tax (expense) benefit |  | 76,981 |  |  | 3,418 |  |  | (273 | ) |  | 9,014 |  |  | — |  |  | 89,140 |
Balance, March 31, 2022 | $ | (253,060 | ) | $ | (11,573 | ) | $ | (80,010 | ) | $ | (14,638 | ) | $ | 5 |  | $ | (359,276 | )
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 | )
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 5 will be reclassified into income over the life of the hedge. Accumulated other comprehensive loss resulting from the terminated interest rate swaps will be 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, |  |  | 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 |  |  | (494 | ) |  |  | (261 | ) |  | Interest income
Tax effect |  |  | 111 |  |  |  | 59 |  |  | Income taxes
Net of tax |  |  | (383 | ) |  |  | (202 | ) |  | Net income
Amortization of defined benefit pension and post-retirement items |  |  | (1,519 | ) |  |  | (1,209 | ) |  | Other noninterest expense (b)
Tax effect |  |  | 340 |  |  |  | 273 |  |  | Income taxes
Net of tax |  |  | (1,179 | ) |  |  | (936 | ) |  | Net income
Reclassification of unrealized gain/(Loss) on cash flow hedges |  |  | (10,629 | ) |  |  | 3,875 |  |  | Interest income
Tax effect |  |  | 2,393 |  |  |  | (875 | ) |  | Income taxes
Net of tax |  |  | (8,236 | ) |  |  | 3,000 |  |  | Net income
Amortization of gain on terminated cash flow hedges |  |  | 2,628 |  |  |  | 2,879 |  |  | Interest income
Tax effect |  |  | (592 | ) |  |  | (650 | ) |  | Income taxes
Net of tax |  |  | 2,036 |  |  |  | 2,229 |  |  | Net income
Reclassification of unrealized loss on equity method investment |  |  | — |  |  |  | (468 | ) |  | Noninterest income
Tax effect |  |  | — |  |  |  | — |  |  | Income taxes
Net of tax |  |  | — |  |  |  | (468 | ) |  | Net income
Total reclassifications, net of tax |  | $ | (7,762 | ) |  | $ | 2,301 |  |  | 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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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI https://asc.fasb.org/topic&trid=2208762 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 16 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496180-112644 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126731327&loc=SL126733271-114008 + Details
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