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Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands | Common Stock | Surplus | Retained Earnings | Other Comprehensive Income (Loss) | Treasury Stock | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2022 | $ 96,420 | $ 154,061 | $ 2,695,567 | $ (470,497) | $ (430,792) | $ 2,044,759
Balance (in shares) at Dec. 31, 2022 | 96,420 |  |  |  |  |
Increase (decrease) in shareholders' equity |  |  |  |  |  |
Net Income (Loss) |  |  | 202,128 |  |  | 202,128
Dividends: |  |  |  |  |  |
Cash |  |  | (39,151) |  |  | (39,151)
Purchase of treasury stock |  |  |  |  | (4,403) | (4,403)
Exercise of stock options | $ 12 | 282 |  |  |  | 294
Exercise of stock options (in shares) | 12 |  |  |  |  |
Stock compensation expense recognized in earnings |  | 179 |  |  |  | 179
Other comprehensive loss, net of tax: |  |  |  |  |  |
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments |  |  |  | (11,815) |  | (11,815)
Balance at Jun. 30, 2023 | $ 96,432 | 154,522 | 2,858,544 | (482,312) | (435,195) | 2,191,991
Balance (in shares) at Jun. 30, 2023 | 96,432 |  |  |  |  |
Balance at Mar. 31, 2023 | $ 96,424 | 154,244 | 2,758,059 | (420,491) | (431,828) | 2,156,408
Balance (in shares) at Mar. 31, 2023 | 96,424 |  |  |  |  |
Increase (decrease) in shareholders' equity |  |  |  |  |  |
Net Income (Loss) |  |  | 100,485 |  |  | 100,485
Dividends: |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  | (3,367) | (3,367)
Exercise of stock options | $ 8 | 201 |  |  |  | 209
Exercise of stock options (in shares) | 8 |  |  |  |  |
Stock compensation expense recognized in earnings |  | 77 |  |  |  | 77
Other comprehensive loss, net of tax: |  |  |  |  |  |
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments |  |  |  | (61,821) |  | (61,821)
Balance at Jun. 30, 2023 | $ 96,432 | 154,522 | 2,858,544 | (482,312) | (435,195) | 2,191,991
Balance (in shares) at Jun. 30, 2023 | 96,432 |  |  |  |  |
Balance at Dec. 31, 2023 | $ 96,467 | 155,511 | 3,029,088 | (397,889) | (435,403) | 2,447,774
Balance (in shares) at Dec. 31, 2023 | 96,467 |  |  |  |  |
Increase (decrease) in shareholders' equity |  |  |  |  |  |
Net Income (Loss) |  |  | 194,311 |  |  | 194,311
Dividends: |  |  |  |  |  |
Cash |  |  | (41,031) |  |  | (41,031)
Purchase of treasury stock |  |  |  |  | (495) | (495)
Exercise of stock options | $ 113 | 2,538 |  |  |  | 2,651
Exercise of stock options (in shares) | 113 |  |  |  |  |
Stock compensation expense recognized in earnings |  | 122 |  |  |  | 122
Other comprehensive loss, net of tax: |  |  |  |  |  |
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments |  |  |  | (25,971) |  | (25,971)
Balance at Jun. 30, 2024 | $ 96,580 | 158,171 | 3,182,368 | (423,860) | (435,898) | 2,577,361
Balance (in shares) at Jun. 30, 2024 | 96,580 |  |  |  |  |
Balance at Mar. 31, 2024 | $ 96,570 | 157,775 | 3,085,388 | (419,945) | (435,898) | 2,483,890
Balance (in shares) at Mar. 31, 2024 | 96,570 |  |  |  |  |
Increase (decrease) in shareholders' equity |  |  |  |  |  |
Net Income (Loss) |  |  | 96,980 |  |  | 96,980
Dividends: |  |  |  |  |  |
Exercise of stock options | $ 10 | 348 |  |  |  | 358
Exercise of stock options (in shares) | 10 |  |  |  |  |
Stock compensation expense recognized in earnings |  | 48 |  |  |  | 48
Other comprehensive loss, net of tax: |  |  |  |  |  |
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments |  |  |  | (3,915) |  | (3,915)
Balance at Jun. 30, 2024 | $ 96,580 | $ 158,171 | $ 3,182,368 | $ (423,860) | $ (435,898) | $ 2,577,361
Balance (in shares) at Jun. 30, 2024 | 96,580 |  |  |  |  |

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