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Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock Outstanding [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member] | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect Period Of Adoption Adjustment [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2019 |  |  | $ 694 | $ 2,219,660 | $ 28,152 | $ 10,306,571 |  | $ (3,422,152)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019 |  |  |  |  |  |  | $ (4,214) |
Balance, shares at Dec. 31, 2019 |  | 40,798,963 |  |  |  |  |  |
Issued during the period, net, shares |  | 159,423 |  |  |  |  |  |
Treasury shares acquired, shares |  | (970,892) |  |  |  |  |  |
Issued during the period, net |  |  | 2 |  |  |  |  |
Share-based compensation plans |  |  |  | (3,181) |  |  |  |
Net increase (decrease) during the period | $ (297,903) |  |  |  | (297,903) |  |  |
Net income (loss) | 16,612 |  |  |  |  | 16,612 |  |
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020) | (63,277) |  |  |  |  | (63,277) |  |
Purchase of treasury shares |  |  |  |  |  |  |  | (200,020)
Balance at Mar. 31, 2020 | 8,580,944 |  | 696 | 2,216,479 | (269,751) | 10,255,692 |  | (3,622,172)
Balance, shares at Mar. 31, 2020 |  | 39,987,494 |  |  |  |  |  |
Balance at Dec. 31, 2020 | $ 9,726,176 |  | 696 | 2,245,301 | 534,899 | 10,567,452 |  | (3,622,172)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2020 |  |  |  |  |  |  |  |
Balance, shares at Dec. 31, 2020 | 69,620,000 | 39,983,481 |  |  |  |  |  |
Issued during the period, net, shares |  | 196,481 |  |  |  |  |  |
Treasury shares acquired, shares |  | (97,462) |  |  |  |  |  |
Issued during the period, net |  |  | 2 |  |  |  |  |
Share-based compensation plans |  |  |  | 436 |  |  |  |
Net increase (decrease) during the period | $ (299,820) |  |  |  | (299,820) |  |  |
Net income (loss) | 341,862 |  |  |  |  | 341,862 |  |
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020) | (62,229) |  |  |  |  | (62,228) |  |
Purchase of treasury shares |  |  |  |  |  |  |  | (23,545)
Balance at Mar. 31, 2021 | $ 9,682,882 |  | $ 698 | $ 2,245,737 | $ 235,079 | $ 10,847,085 |  | $ (3,645,717)
Balance, shares at Mar. 31, 2021 | 69,816,000 | 40,082,500 |  |  |  |  |  |

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