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Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss), Net of Tax [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of accounting change | $ (2,285) |  |  |  | $ (2,285) |  |
Adjusted beginning balance | 3,295,578 | $ 144,486 | $ 642 | $ 953,361 | 2,184,784 | $ 79,512 | $ (67,207)
Balance at Dec. 31, 2017 | 3,297,863 | 144,486 | 642 | 953,361 | 2,187,069 | 79,512 | (67,207)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 454,918 |  |  |  | 454,918 |  |
Other comprehensive income, net of tax | (152,647) |  |  |  |  | (152,647) |
Reclassification of certain income tax effects related to the change in the U.S. statutory federal income tax rate under the Tax Cuts and Jobs Act |  |  |  |  | (9,535) | 9,535 |
Proceeds from stock option exercises/stock unit conversions (408,563 shares, 399,224 shares, and 548,238 shares during 2020, 2019, and 2018, respectively) | 31,647 |  |  |  | (16,653) |  | 48,300
Stock-based compensation expense recognized in earnings | 13,943 |  |  | 13,943 |  |  |
Purchase of treasury stock (206,951 shares, 716,062 shares, and 1,037,982 shares during 2020, 2019, and 2018, respectively) | (101,010) |  |  |  |  |  | (101,010)
Treasury stock issued to the 401(k) stock purchase plan (140,264 shares) | 0 |  |  |  |  |  |
Cash dividends paid on preferred stock (approximately $0.34 per share in 2020 and $1.34 per share in 2019 and 2018) | (8,063) |  |  |  | (8,063) |  |
Cash dividends – common stock ($2.85 per share, $2.80 per share, and $2.58 per share in 2020, 2019, and 2018, respectively) | (165,449) |  |  |  | (165,449) |  |
Balance at Dec. 31, 2018 | 3,368,917 | 144,486 | 642 | 967,304 | 2,440,002 | (63,600) | (119,917)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of accounting change | (14,672) |  |  |  | (14,672) |  |
Adjusted beginning balance | 3,354,245 | 144,486 | 642 | 967,304 | 2,425,330 | (63,600) | (119,917)
Net income | 443,599 |  |  |  | 443,599 |  |
Other comprehensive income, net of tax | 330,970 |  |  |  |  | 330,970 |
Proceeds from stock option exercises/stock unit conversions (408,563 shares, 399,224 shares, and 548,238 shares during 2020, 2019, and 2018, respectively) | 20,770 |  |  |  | (16,326) |  | 37,096
Stock-based compensation expense recognized in earnings | 15,946 |  |  | 15,946 |  |  |
Purchase of treasury stock (206,951 shares, 716,062 shares, and 1,037,982 shares during 2020, 2019, and 2018, respectively) | (68,793) |  |  |  |  |  | (68,793)
Treasury stock issued to the 401(k) stock purchase plan (140,264 shares) | 0 |  |  |  |  |  |
Cash dividends paid on preferred stock (approximately $0.34 per share in 2020 and $1.34 per share in 2019 and 2018) | (8,063) |  |  |  | (8,063) |  |
Cash dividends – common stock ($2.85 per share, $2.80 per share, and $2.58 per share in 2020, 2019, and 2018, respectively) | (177,006) |  |  |  | (177,006) |  |
Balance at Dec. 31, 2019 | 3,911,668 | 144,486 | 642 | 983,250 | 2,667,534 | 267,370 | (151,614)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of accounting change | (29,252) |  |  |  | (29,252) |  |
Adjusted beginning balance | 3,882,416 | 144,486 | 642 | 983,250 | 2,638,282 | 267,370 | (151,614)
Net income | 331,151 |  |  |  | 331,151 |  |
Other comprehensive income, net of tax | 245,600 |  |  |  |  | 245,600 |
Proceeds from stock option exercises/stock unit conversions (408,563 shares, 399,224 shares, and 548,238 shares during 2020, 2019, and 2018, respectively) | 12,557 |  |  |  | (27,214) |  | 39,771
Stock-based compensation expense recognized in earnings | 13,918 |  |  | 13,918 |  |  |
Redemption of series A preferred stock (6,000,000 shares) | (150,000) | (144,486) |  |  | (5,514) |  |
Issuance of series B preferred stock (150,000 shares) | 145,452 | 145,452 |  |  |  |  |
Purchase of treasury stock (206,951 shares, 716,062 shares, and 1,037,982 shares during 2020, 2019, and 2018, respectively) | (15,785) |  |  |  |  |  | (15,785)
Treasury stock issued to the 401(k) stock purchase plan (140,264 shares) | 10,307 |  |  |  | (3,382) |  | 13,689
Cash dividends paid on preferred stock (approximately $0.34 per share in 2020 and $1.34 per share in 2019 and 2018) | (2,016) |  |  |  | (2,016) |  |
Cash dividends – common stock ($2.85 per share, $2.80 per share, and $2.58 per share in 2020, 2019, and 2018, respectively) | (180,584) |  |  |  | (180,584) |  |
Balance at Dec. 31, 2020 | $ 4,293,016 | $ 145,452 | $ 642 | $ 997,168 | $ 2,750,723 | $ 512,970 | $ (113,939)

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