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Shareholders' Equity | 12 Months Ended
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Dec. 31, 2021
Stockholders Equity Note [Abstract] |
Shareholders' Equity | Note 11. Shareholders’ Equity Regulatory Capital The table below sets forth the minimum required capital amounts and ratios for well capitalized institutions and the actual capital amounts and ratios for the Company and the Bank as of December 31, 2021, and December 31, 2020:
(dollars in thousands) |  | Well Capitalized Minimum Ratio |  |  | Company |  |  | Bank |
As of December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Common Shareholders’ Equity |  |  |  |  |  | $ | 1,436,124 |  |  | $ | 1,586,473 |
Common Equity Tier 1 Capital |  |  |  |  |  |  | 1,483,455 |  |  |  | 1,645,405 |
Tier 1 Capital |  |  |  |  |  |  | 1,658,942 |  |  |  | 1,645,405 |
Total Capital |  |  |  |  |  |  | 1,811,943 |  |  |  | 1,798,190 |
Common Equity Tier 1 Capital Ratio |  |  | 6.5 | % |  |  | 12.12 | % |  |  | 13.47 | %
Tier 1 Capital Ratio |  |  | 8.0 | % |  |  | 13.56 | % |  |  | 13.47 | %
Total Capital Ratio |  |  | 10.0 | % |  |  | 14.81 | % |  |  | 14.72 | %
Tier 1 Leverage Ratio |  |  | 5.0 | % |  |  | 7.32 | % |  |  | 7.26 | %
As of December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Common Shareholders’ Equity |  |  |  |  |  | $ | 1,374,507 |  |  | $ | 1,290,455 |
Common Equity Tier 1 Capital |  |  |  |  |  |  | 1,361,915 |  |  |  | 1,289,435 |
Tier 1 Capital |  |  |  |  |  |  | 1,361,915 |  |  |  | 1,289,435 |
Total Capital |  |  |  |  |  |  | 1,503,784 |  |  |  | 1,431,106 |
Common Equity Tier 1 Capital Ratio |  |  | 6.5 | % |  |  | 12.06 | % |  |  | 11.43 | %
Tier 1 Capital Ratio |  |  | 8.0 | % |  |  | 12.06 | % |  |  | 11.43 | %
Total Capital Ratio |  |  | 10.0 | % |  |  | 13.31 | % |  |  | 12.69 | %
Tier 1 Leverage Ratio |  |  | 5.0 | % |  |  | 6.71 | % |  |  | 6.35 | %
The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can result in certain mandatory, and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classifications are also subject to qualitative judgments by regulators about the components of regulatory capital, risk weightings, and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of Common Equity Tier 1, Tier 1 and Total Capital. Common Equity Tier 1 Capital is common shareholders’ equity, reduced by certain intangible assets, postretirement benefit liability adjustments, and unrealized gains and losses on investment securities. Tier 1 Capital consists of Common Equity Tier 1 Capital and additional tier 1 capital instruments meeting specified requirements. Total Capital is Tier 1 Capital plus an allowable amount of the reserve for credit losses. Risk-weighted assets are calculated by taking assets and credit equivalent amounts of off-balance-sheet items and assigning them to one of several broad risk categories. Four capital ratios are used to measure capital adequacy: Common Equity Tier 1 Capital divided by risk-weighted assets, as defined; Tier 1 Capital divided by risk-weighted assets; Total Capital divided by risk-weighted assets; and the Tier 1 Leverage ratio, which is Tier 1 Capital divided by quarterly adjusted average total assets. In addition to the minimum risk-based capital requirements, all banks must hold additional capital, referred to as the capital conservation buffer (which is in the form of common equity) under the U.S. Basel III capital framework, to avoid being subject to limits on capital distributions and certain discretionary bonus payments to officers. The capital conservation buffer which was fully phased-in on January 1, 2019, is a minimum of 2.5% of additional capital in addition to the minimum risk-based capital ratios. As of December 31, 2021, the Company and the Bank were well capitalized as defined in the regulatory framework for prompt corrective action. The capital conservation buffer requirements do not currently result in any limitations on distributions or discretionary bonuses for the Company or the Bank. There were no conditions or events since December 31, 2021, that management believes have changed the Company or the Bank’s capital classifications. The Company elected to apply the modified transition provision related to the impact of the CECL accounting standard on regulatory capital, as provided by the U.S. banking agencies’ March 2020 interim final rule that was finalized on September 30, 2020. Under the modified CECL transition provision, the regulatory capital impact of the Day 1 adjustment to the allowance for credit losses (after-tax), upon the January 1, 2020, CECL adoption date, has been deferred, and will phase in to regulatory capital at 25% per year commencing January 1, 2022. For the ongoing impact of CECL, the Company is allowed to defer the regulatory capital impact of the allowance for credit losses in an amount equal to 25% of the change in the allowance for credit losses (pre-tax) recognized through earnings for each period between January 1, 2020, and December 31, 2021. The cumulative adjustment to the allowance for credit losses between January 1, 2020, and December 31, 2021, will also phase in to regulatory capital at 25% per year commencing January 1, 2022. Dividends Dividends paid by the Parent are substantially funded from dividends received from the Bank. The Bank is subject to federal and state regulatory restrictions that limit cash dividends and loans to the Parent. These restrictions generally require advanced approval from the Bank’s regulator for payment of dividends in excess of the sum of net income for the current calendar year and the retained net income of the prior two calendar years. Common Stock Repurchase Program The Parent has a common stock repurchase program in which shares repurchased are held in treasury stock for reissuance in connection with share-based compensation plans and for general corporate purposes. For the year ended December 31, 2021, the Parent repurchased 328,832 shares of common stock under its share repurchase program at an average cost per share of $83.14 and total cost of $27.3 million. From the beginning of the stock repurchase program in July 2001 through December 31, 2021, the Parent repurchased a total of 57.4 million shares of common stock at an average cost of $40.76 per share and total cost of $2.3 billion. The Company suspended share repurchases from March 2020 to July 2021 in light of the COVID-19 pandemic. The actual amount and timing of future share repurchases, if any, will depend on market conditions, applicable SEC rules and various other factors. Preferred Stock Issuance On June 15, 2021, the Company issued and sold 7,200,000 depositary shares (the “depositary shares”), each representing a 1/40th ownership interest in a share of 4.375% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A, par value $0.01 per share (the “Series A Preferred Stock”). The Series A Preferred Stock has a liquidation preference of $ 1,000 per share. Net proceeds, after underwriting discounts and expenses, totaled $175.5 million. Dividends on the Series A Preferred Stock are not cumulative and will be paid when declared by the Parent’s Board of Directors to the extent that the Company have legally available funds to pay dividends. If declared, dividends will accrue and be payable quarterly, in arrears, on the liquidation preference amount, on a non-cumulative basis, at a rate of 4.375% per annum. Holders of the Series A Preferred Stock will not have voting rights, except with respect to certain changes in the terms of the preferred stock, certain dividend non-payments and as otherwise required by applicable law. The Company may redeem the Series A Preferred Stock at its option, (i) in whole or in part, from time to time, on any dividend payment date on or after August 1, 2026 or (ii) in whole but not in part, at any time within 90 days following a regulatory capital treatment event, in either case at a redemption price equal to $1,000 per share (equivalent to $25 per depositary share), plus any declared and unpaid dividends. Accumulated Other Comprehensive Income The following table presents the components of other comprehensive income (loss), net of tax:
(dollars in thousands) |  | Before Tax |  |  | Tax Effect |  |  | Net of Tax |
Year Ended December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) on Investment Securities: |  |  |  |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period |  | $ | (111,084 | ) |  | $ | (29,440 | ) |  | $ | (81,644 | )
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: |  |  |  |  |  |  |  |  |  |  |  |
(Gain) Loss on Sale |  |  | (3,798 | ) |  |  | (1,007 | ) |  |  | (2,791 | )
Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 |  |  | 648 |  |  |  | 171 |  |  |  | 477 |
Net Unrealized Gains (Losses) on Investment Securities |  |  | (114,234 | ) |  |  | (30,276 | ) |  |  | (83,958 | )
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |
Net Actuarial Gains (Losses) Arising During the Period |  |  | 10,842 |  |  |  | 2,874 |  |  |  | 7,968 |
Amortization of Net Actuarial Losses (Gains) |  |  | 2,676 |  |  |  | 709 |  |  |  | 1,967 |
Amortization of Prior Service Credit |  |  | (246 | ) |  |  | (65 | ) |  |  | (181 | )
Defined Benefit Plans, Net |  |  | 13,272 |  |  |  | 3,518 |  |  |  | 9,754 |
Other Comprehensive Income (Loss) |  | $ | (100,962 | ) |  | $ | (26,758 | ) |  | $ | (74,204 | )
Year Ended December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) on Investment Securities: |  |  |  |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period |  | $ | 58,763 |  |  | $ | 15,600 |  |  | $ | 43,163 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: |  |  |  |  |  |  |  |  |  |  |  |
(Gain) Loss on Sale |  |  | (77 | ) |  |  | (50 | ) |  |  | (27 | )
Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 |  |  | 397 |  |  |  | 105 |  |  |  | 292 |
Net Unrealized Gains (Losses) on Investment Securities |  |  | 59,083 |  |  |  | 15,655 |  |  |  | 43,428 |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |
Net Actuarial Gains (Losses) Arising During the Period |  |  | (8,187 | ) |  |  | (2,170 | ) |  |  | (6,017 | )
Amortization of Net Actuarial Losses (Gains) |  |  | 2,318 |  |  |  | 614 |  |  |  | 1,704 |
Amortization of Prior Service Credit |  |  | (246 | ) |  |  | (65 | ) |  |  | (181 | )
Defined Benefit Plans, Net |  |  | (6,115 | ) |  |  | (1,621 | ) |  |  | (4,494 | )
Other Comprehensive Income (Loss) |  | $ | 52,968 |  |  | $ | 14,034 |  |  | $ | 38,934 |
Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) on Investment Securities: |  |  |  |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period |  | $ | 30,169 |  |  | $ | 8,001 |  |  | $ | 22,168 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: |  |  |  |  |  |  |  |  |  |  |  |
(Gain) Loss on Sale |  |  | (152 | ) |  |  | (49 | ) |  |  | (103 | )
Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 |  |  | 833 |  |  |  | 221 |  |  |  | 612 |
Net Unrealized Gains (Losses) on Investment Securities |  |  | 30,850 |  |  |  | 8,173 |  |  |  | 22,677 |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |
Net Actuarial Gains (Losses) Arising During the Period |  |  | (5,046 | ) |  |  | (1,337 | ) |  |  | (3,709 | )
Amortization of Net Actuarial Losses (Gains) |  |  | 1,598 |  |  |  | 423 |  |  |  | 1,175 |
Amortization of Prior Service Credit |  |  | (288 | ) |  |  | (76 | ) |  |  | (212 | )
Defined Benefit Plans, Net |  |  | (3,736 | ) |  |  | (990 | ) |  |  | (2,746 | )
Other Comprehensive Income (Loss) |  | $ | 27,114 |  |  | $ | 7,183 |  |  | $ | 19,931 |
1 | The amount relates to the amortization/accretion of unrealized gains and losses related to the Company's reclassification of available-for-sale investment securities to the held-to-maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.
The following table presents the changes in each component of accumulated other comprehensive income (loss), net of tax:
(dollars in thousands) |  | Investment Securities- Available- For-Sale |  |  | Investment Securities- Held-To- Maturities |  |  | Defined Benefit Plans |  |  | Accumulated Other Comprehensive Income (Loss) |
Year Ended December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | $ | 51,495 |  |  | $ | (423 | ) |  | $ | (43,250 | ) |  | $ | 7,822 |
Other Comprehensive Income (Loss) Before Reclassifications |  |  | (81,644 | ) |  |  | — |  |  |  | 7,968 |  |  |  | (73,676 | )
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | (2,791 | ) |  |  | 477 |  |  |  | 1,786 |  |  |  | (528 | )
Total Other Comprehensive Income (Loss) |  |  | (84,435 | ) |  |  | 477 |  |  |  | 9,754 |  |  |  | (74,204 | )
Balance at End of Period |  | $ | (32,940 | ) |  | $ | 54 |  |  | $ | (33,496 | ) |  | $ | (66,382 | )
Year Ended December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | $ | 8,359 |  |  | $ | (715 | ) |  | $ | (38,756 | ) |  | $ | (31,112 | )
Other Comprehensive Income (Loss) Before Reclassifications |  |  | 43,163 |  |  |  | — |  |  |  | (6,017 | ) |  |  | 37,146 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | (27 | ) |  |  | 292 |  |  |  | 1,523 |  |  |  | 1,788 |
Total Other Comprehensive Income (Loss) |  |  | 43,136 |  |  |  | 292 |  |  |  | (4,494 | ) |  |  | 38,934 |
Balance at End of Period |  | $ | 51,495 |  |  | $ | (423 | ) |  | $ | (43,250 | ) |  | $ | 7,822 |
Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | $ | (10,447 | ) |  | $ | (4,586 | ) |  | $ | (36,010 | ) |  | $ | (51,043 | )
Other Comprehensive Income (Loss) Before Reclassifications |  |  | 22,168 |  |  |  | — |  |  |  | (3,709 | ) |  |  | 18,459 |
Cumulative Effect of ASU 2019-04 |  |  | (3,259 | ) |  |  | 3,259 |  |  |  | — |  |  |  | — |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | (103 | ) |  |  | 612 |  |  |  | 963 |  |  |  | 1,472 |
Total Other Comprehensive Income (Loss) |  |  | 18,806 |  |  |  | 3,871 |  |  |  | (2,746 | ) |  |  | 19,931 |
Balance at End of Period |  | $ | 8,359 |  |  | $ | (715 | ) |  | $ | (38,756 | ) |  | $ | (31,112 | )
The following table presents the amounts reclassified out of each component of accumulated other comprehensive income (loss):
Details about Accumulated Other Comprehensive Income (Loss) Components |  | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)1 |  |  | Affected Line Item in the Statement Where Net Income Is Presented
(dollars in thousands) |  | Year Ended December 31, |  |  |
|  | 2021 |  |  | 2020 |  |  | 2019 |  |  |
Amortization of Unrealized Holding Gains (Losses) on Investment Securities Held-to-Maturity |  | $ | (648 | ) |  | $ | (397 | ) |  | $ | (833 | ) |  | Interest Income
|  |  | 171 |  |  |  | 105 |  |  |  | 221 |  |  | Provision for Income Tax
|  |  | (477 | ) |  |  | (292 | ) |  |  | (612 | ) |  | Net of Tax
Sales of Investment Securities Available-for-Sale |  |  | 3,798 |  |  |  | 77 |  |  |  | 152 |  |  | Investment Securities Gains (Losses), Net
|  |  | (1,007 | ) |  |  | (50 | ) |  |  | (49 | ) |  | Provision for Income Tax
|  |  | 2,791 |  |  |  | 27 |  |  |  | 103 |  |  | Net of Tax
Amortization of Defined Benefit Plans Items |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Service Credit 2 |  |  | 246 |  |  |  | 246 |  |  |  | 288 |  |  |
Net Actuarial Losses 2 |  |  | (2,676 | ) |  |  | (2,318 | ) |  |  | (1,598 | ) |  |
|  |  | (2,430 | ) |  |  | (2,072 | ) |  |  | (1,310 | ) |  | Total Before Tax
|  |  | 644 |  |  |  | 549 |  |  |  | 347 |  |  | Provision for Income Tax
|  |  | (1,786 | ) |  |  | (1,523 | ) |  |  | (963 | ) |  | Net of Tax
Total Reclassifications for the Period |  | $ | 528 |  |  | $ | (1,788 | ) |  | $ | (1,472 | ) |  | Net of Tax
1 | Amounts in parentheses indicate reductions to net income.
2 | These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost and are included in Other Noninterest Expense on the consolidated statements of income (see Note 14 Pension Plans and Postretirement Benefit Plan 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=123467817&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 14 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 5: 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 http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 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 http://asc.fasb.org/extlink&oid=123467817&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 http://asc.fasb.org/extlink&oid=123467817&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 http://asc.fasb.org/extlink&oid=123467817&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 http://asc.fasb.org/extlink&oid=123467817&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 http://asc.fasb.org/extlink&oid=123467817&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 http://asc.fasb.org/extlink&oid=123467817&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 http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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