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Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Share awards vesting Treasury Stock, Common | 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, Common
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2020 | $ 4,293,016 |  | $ 145,452 | $ 642 | $ 997,168 | $ 2,750,723 | $ 512,970 | $ (113,939)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 443,079 |  |  |  |  | 443,079 |  |
Other comprehensive income, net of tax | (165,652) |  |  |  |  |  | (165,652) |
Proceeds from stock option exercises/stock unit conversions (267,357 shares, 399,810 shares, and 987,758 shares during 2022, 2021, and 2020, respectively) | 54,417 |  |  |  |  | (40,836) |  | 95,253
Stock-based compensation expense recognized in earnings | 12,753 |  |  |  | 12,753 |  |  |
Purchase of treasury stock (436,765 shares, 31,351 shares, and 31,317 shares during 2022, 2021, and 2020, respectively) | (3,864) | $ (3,900) |  |  |  |  |  | (3,864)
Treasury Stock issued to the 401(k) stock purchase plan (18,555 shares in 2021) | 1,749 |  |  |  |  | (57) |  | 1,806
Cash dividends paid on preferred stock (approximately $44.50 per share which is equivalent to approximately $1.11 per depositary share in 2023 and 2022 and approximately $47.71 per share which is equivalent to approximately $1.19 per share in 2021) | (7,157) |  |  |  |  | (7,157) |  |
Cash dividends – common stock ($3.58 per share, $3.24 per share, and $2.94 per share in 2022, 2021, and 2020, respectively) | (188,786) |  |  |  |  | (188,786) |  |
Balance at Dec. 31, 2021 | $ 4,439,555 |  | 145,452 | 642 | 1,009,921 | 2,956,966 | 347,318 | (20,744)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 0 | 31,317 |  |  |  |  |  |
Net income | $ 579,150 |  |  |  |  | 579,150 |  |
Other comprehensive income, net of tax | (1,695,612) |  |  |  |  |  | (1,695,612) |
Proceeds from stock option exercises/stock unit conversions (267,357 shares, 399,810 shares, and 987,758 shares during 2022, 2021, and 2020, respectively) | 16,659 |  |  | 1 | 1,513 | (9,990) |  | 25,135
Stock-based compensation expense recognized in earnings | 18,322 |  |  |  | 18,322 |  |  |
Purchase of treasury stock (436,765 shares, 31,351 shares, and 31,317 shares during 2022, 2021, and 2020, respectively) | (4,391) | $ (4,400) |  |  |  |  |  | (4,391)
Treasury Stock issued to the 401(k) stock purchase plan (18,555 shares in 2021) | 0 |  |  |  |  |  |  |
Cash dividends paid on preferred stock (approximately $44.50 per share which is equivalent to approximately $1.11 per depositary share in 2023 and 2022 and approximately $47.71 per share which is equivalent to approximately $1.19 per share in 2021) | (6,675) |  |  |  |  | (6,675) |  |
Cash dividends – common stock ($3.58 per share, $3.24 per share, and $2.94 per share in 2022, 2021, and 2020, respectively) | (209,780) |  |  |  |  | (209,780) |  |
Balance at Dec. 31, 2022 | $ 3,137,228 |  | 145,452 | 643 | 1,029,756 | 3,309,671 | (1,348,294) | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 0 | 31,351 |  |  |  |  |  |
Net income | $ 597,973 |  |  |  |  | 597,973 |  |
Other comprehensive income, net of tax | 229,075 |  |  |  |  |  | 229,075 |
Proceeds from stock option exercises/stock unit conversions (267,357 shares, 399,810 shares, and 987,758 shares during 2022, 2021, and 2020, respectively) | 9,299 |  |  | 1 | 1,463 | (10,958) |  | 18,793
Stock-based compensation expense recognized in earnings | 24,590 |  |  |  | 24,590 |  |  |
Purchase of treasury stock (436,765 shares, 31,351 shares, and 31,317 shares during 2022, 2021, and 2020, respectively) | (42,720) | $ (3,500) |  |  |  |  |  | (42,720)
Treasury Stock issued to the 401(k) stock purchase plan (18,555 shares in 2021) | 0 |  |  |  |  |  |  |
Cash dividends paid on preferred stock (approximately $44.50 per share which is equivalent to approximately $1.11 per depositary share in 2023 and 2022 and approximately $47.71 per share which is equivalent to approximately $1.19 per share in 2021) | (6,675) |  |  |  |  | (6,675) |  |
Cash dividends – common stock ($3.58 per share, $3.24 per share, and $2.94 per share in 2022, 2021, and 2020, respectively) | (232,323) |  |  |  |  | (232,323) |  |
Balance at Dec. 31, 2023 | $ 3,716,447 |  | $ 145,452 | $ 644 | $ 1,055,809 | $ 3,657,688 | $ (1,119,219) | $ (23,927)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 436,765 | 35,897 |  |  |  |  |  |

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