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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment [Member] | Common Stock [Member] | Capital Surplus [Member] | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss), Net [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 3,081,340 |  | $ 292,716 | $ 1,725,741 | $ 1,243,592 |  | $ (180,709)
Balance, Shares Issued at Dec. 31, 2018 |  |  | 87,903 |  |  |  |
Net income (loss) | 235,248 |  |  |  | 235,248 |  |
Other comprehensive income (loss) | 129,553 |  |  |  |  |  | 129,553
Comprehensive income | 364,801 |  |  |  | 235,248 |  | 129,553
Cash dividends declared | (70,771) |  |  |  | (70,771) |  |
Common stock issued in business combination | 193,849 |  | $ 16,797 | 177,052 |  |  |
Common stock issued in business combination, Shares Issued |  |  | 5,044 |  |  |  |
Common stock activity, long-term incentive plans | 14,469 |  |  | 14,355 | 114 |  |
Issuance of stock from dividend reinvestment and stock purchase plans | 2,692 |  |  | 2,692 |  |  |
Balance at Sep. 30, 2019 | 3,586,380 |  | $ 309,513 | 1,919,840 | 1,408,183 |  | (51,156)
Balance, Shares Issued at Sep. 30, 2019 |  |  | 92,947 |  |  |  |
Balance at Jun. 30, 2019 | 3,318,915 |  | $ 292,716 | 1,737,492 | 1,363,910 |  | (75,203)
Balance, Shares Issued at Jun. 30, 2019 |  |  | 87,903 |  |  |  |
Net income (loss) | 67,807 |  |  |  | 67,807 |  |
Other comprehensive income (loss) | 24,047 |  |  |  |  |  | 24,047
Comprehensive income | 91,854 |  |  |  | 67,807 |  | 24,047
Cash dividends declared | (23,597) |  |  |  | (23,597) |  |
Common stock issued in business combination | 193,849 |  | $ 16,797 | 177,052 |  |  |
Common stock issued in business combination, Shares Issued |  |  | 5,044 |  |  |  |
Common stock activity, long-term incentive plans | 4,470 |  |  | 4,407 | 63 |  |
Issuance of stock from dividend reinvestment and stock purchase plans | 889 |  |  | 889 |  |  |
Balance at Sep. 30, 2019 | 3,586,380 |  | $ 309,513 | 1,919,840 | 1,408,183 |  | (51,156)
Balance, Shares Issued at Sep. 30, 2019 |  |  | 92,947 |  |  |  |
Balance at Dec. 31, 2019 | $ 3,467,685 | $ (44,087) | $ 309,513 | 1,736,664 | 1,476,232 | $ (44,087) | (54,724)
Balance, Shares Issued at Dec. 31, 2019 | 92,947 |  | 92,947 |  |  |  |
Net income (loss) | $ (148,749) |  |  |  | (148,749) |  |
Other comprehensive income (loss) | 153,662 |  |  |  |  |  | 153,662
Comprehensive income | 4,913 |  |  |  | (148,749) |  | 153,662
Cash dividends declared | (71,620) |  |  |  | (71,620) |  |
Common stock activity, long-term incentive plans | 16,261 |  |  | 16,159 | 102 |  |
Net settlement of accelerated share repurchase agreement (1,001,472 shares) | 12,110 |  |  | 12,110 |  |  |
Repurchase of common stock | (12,716) |  |  | (12,716) |  |  |
Issuance of stock from dividend reinvestment and stock purchase plans | 3,098 |  |  | 3,098 |  |  |
Balance at Sep. 30, 2020 | $ 3,375,644 |  | $ 309,513 | 1,755,315 | 1,211,878 |  | 98,938
Balance, Shares Issued at Sep. 30, 2020 | 92,947 |  | 92,947 |  |  |  |
Balance at Jun. 30, 2020 | $ 3,316,157 |  | $ 309,513 | 1,747,640 | 1,156,278 |  | 102,726
Balance, Shares Issued at Jun. 30, 2020 |  |  | 92,947 |  |  |  |
Net income (loss) | 79,356 |  |  |  | 79,356 |  |
Other comprehensive income (loss) | (3,788) |  |  |  |  |  | (3,788)
Comprehensive income | 75,568 |  |  |  | 79,356 |  | (3,788)
Cash dividends declared | (23,803) |  |  |  | (23,803) |  |
Common stock activity, long-term incentive plans | 6,642 |  |  | 6,595 | 47 |  |
Issuance of stock from dividend reinvestment and stock purchase plans | 1,080 |  |  | 1,080 |  |  |
Balance at Sep. 30, 2020 | $ 3,375,644 |  | $ 309,513 | $ 1,755,315 | $ 1,211,878 |  | $ 98,938
Balance, Shares Issued at Sep. 30, 2020 | 92,947 |  | 92,947 |  |  |  |

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