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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Capital Surplus [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2022 | $ 3,342,628 | $ 309,513 | $ 1,716,884 | $ 2,088,413 | $ (772,182)
Balance, Shares Issued at Dec. 31, 2022 |  | 92,947 |  |  |
Net income | 244,261 |  |  | 244,261 |
Other comprehensive income (loss) | 9,396 |  |  |  | 9,396
Comprehensive income | 253,657 |  |  |  |
Cash dividends declared | (52,779) |  |  | (52,779) |
Common stock activity, long-term incentive plans | 9,036 |  | 8,927 | 109 |
Issuance of stock from dividend reinvestment and stock purchase plans | 1,934 |  | 1,934 |  |
Balance at Jun. 30, 2023 | 3,554,476 | $ 309,513 | 1,727,745 | 2,280,004 | (762,786)
Balance, Shares Issued at Jun. 30, 2023 |  | 92,947 |  |  |
Balance at Mar. 31, 2023 | 3,531,232 | $ 309,513 | 1,720,623 | 2,188,561 | (687,465)
Balance, Shares Issued at Mar. 31, 2023 |  | 92,947 |  |  |
Net income | 117,794 |  |  | 117,794 |
Other comprehensive income (loss) | (75,321) |  |  |  | (75,321)
Comprehensive income | 42,473 |  |  |  |
Cash dividends declared | (26,392) |  |  | (26,392) |
Common stock activity, long-term incentive plans | 6,164 |  | 6,123 | 41 |
Issuance of stock from dividend reinvestment and stock purchase plans | 999 |  | 999 |  |
Balance at Jun. 30, 2023 | 3,554,476 | $ 309,513 | 1,727,745 | 2,280,004 | (762,786)
Balance, Shares Issued at Jun. 30, 2023 |  | 92,947 |  |  |
Balance at Dec. 31, 2023 | $ 3,803,661 | $ 309,513 | 1,739,671 | 2,375,604 | (621,127)
Balance, Shares Issued at Dec. 31, 2023 | 92,947 | 92,947 |  |  |
Net income | $ 223,169 |  |  | 223,169 |
Other comprehensive income (loss) | (36,809) |  |  |  | (36,809)
Comprehensive income | 186,360 |  |  |  |
Cash dividends declared | (61,801) |  |  | (61,801) |
Common stock activity, long-term incentive plans | 5,102 |  | 5,017 | 85 |
Issuance of stock from dividend reinvestment and stock purchase plans | 2,018 |  | 2,018 |  |
Repurchase of common stock | (14,622) |  | (14,622) |  |
Balance at Jun. 30, 2024 | $ 3,920,718 | $ 309,513 | 1,732,084 | 2,537,057 | (657,936)
Balance, Shares Issued at Jun. 30, 2024 | 92,947 | 92,947 |  |  |
Balance at Mar. 31, 2024 | $ 3,853,436 | $ 309,513 | 1,739,702 | 2,457,736 | (653,515)
Balance, Shares Issued at Mar. 31, 2024 |  | 92,947 |  |  |
Net income | 114,557 |  |  | 114,557 |
Other comprehensive income (loss) | (4,421) |  |  |  | (4,421)
Comprehensive income | 110,136 |  |  |  |
Cash dividends declared | (35,274) |  |  | (35,274) |
Common stock activity, long-term incentive plans | 5,921 |  | 5,883 | 38 |
Issuance of stock from dividend reinvestment and stock purchase plans | 1,121 |  | 1,121 |  |
Repurchase of common stock | (14,622) |  | (14,622) |  |
Balance at Jun. 30, 2024 | $ 3,920,718 | $ 309,513 | $ 1,732,084 | $ 2,537,057 | $ (657,936)
Balance, Shares Issued at Jun. 30, 2024 | 92,947 | 92,947 |  |  |

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