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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock [Member] | Common Stock [Member] | Additional paid-in capital [Member] | Retained Earnings [Member] | Accumulated other comprehensive income (loss) [Member] | Treasury Stock, Common
--- | --- | --- | --- | --- | --- | --- | ---
Preferred stock, shares outstanding | 8,000 |  |  |  |  |  |
Beginning of period at Dec. 31, 2021 |  | $ 200,000 | $ 208,902 | $ 464,347 | $ 2,603,472 | $ 115,099 | $ (608,935)
Issuance of preferred stock |  | 0 |  |  |  |  |
Dividend reinvestment plan |  |  | 34 | 1,325 |  |  |
Stock purchase and compensation plans |  |  | 622 | 20,567 |  |  |
Net income | $ 138,375 |  |  |  | 138,375 |  |
Dividends to preferred stockholders |  |  |  |  | (6,900) |  |
Dividends to common stockholders |  |  |  |  | (51,184) |  |
Other comprehensive income (loss) | (640,110) |  |  |  |  | (640,110) |
Acquisition of treasury stock - share repurchase authorization |  |  |  |  |  |  | (12,423)
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans |  |  |  |  |  |  | (5,658)
End of period at Sep. 30, 2022 | $ 2,427,533 | $ 200,000 | 209,558 | 486,239 | 2,683,763 | (525,011) | (627,016)
Dividends declared per preferred share (in dollars per share) | $ 862.50 |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.84 |  |  |  |  |  |
Issuance of preferred stock, shares |  | 0 |  |  |  |  |
Common stock, shares outstanding, beginning of period at Dec. 31, 2021 | 60,184,382 |  |  |  |  |  |
Dividend reinvestment plan, shares | 17,152 |  |  |  |  |  |
Stock purchase and compensation plan, shares | 310,760 |  |  |  |  |  |
Acquisition of treasury stock, share repurchase authorization, shares | (165,159) |  |  |  |  |  |
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares | (73,644) |  |  |  |  |  |
Common stock, shares outstanding, end of period at Sep. 30, 2022 | 60,273,491 |  |  |  |  |  |
Preferred stock, shares outstanding | 8,000 |  |  |  |  |  |
Beginning of period at Jun. 30, 2022 |  | $ 200,000 | 209,506 | 481,380 | 2,660,584 | (336,370) | (621,010)
Issuance of preferred stock |  | 0 |  |  |  |  |
Dividend reinvestment plan |  |  | 11 | 438 |  |  |
Stock purchase and compensation plans |  |  | 41 | 4,421 |  |  |
Net income | $ 42,525 |  |  |  | 42,525 |  |
Dividends to preferred stockholders |  |  |  |  | (2,300) |  |
Dividends to common stockholders |  |  |  |  | (17,046) |  |
Other comprehensive income (loss) | (188,641) |  |  |  |  | (188,641) |
Acquisition of treasury stock - share repurchase authorization |  |  |  |  |  |  | (5,931)
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans |  |  |  |  |  |  | (75)
End of period at Sep. 30, 2022 | $ 2,427,533 | $ 200,000 | 209,558 | 486,239 | 2,683,763 | (525,011) | (627,016)
Dividends declared per preferred share (in dollars per share) | $ 287.50 |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.28 |  |  |  |  |  |
Issuance of preferred stock, shares |  | 0 |  |  |  |  |
Common stock, shares outstanding, beginning of period at Jun. 30, 2022 | 60,327,734 |  |  |  |  |  |
Dividend reinvestment plan, shares | 5,647 |  |  |  |  |  |
Stock purchase and compensation plan, shares | 20,073 |  |  |  |  |  |
Acquisition of treasury stock, share repurchase authorization, shares | (79,100) |  |  |  |  |  |
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares | (863) |  |  |  |  |  |
Common stock, shares outstanding, end of period at Sep. 30, 2022 | 60,273,491 |  |  |  |  |  |
Preferred stock, shares outstanding | 8,000 |  |  |  |  |  |
Preferred stock, shares outstanding | 8,000 |  |  |  |  |  |
Beginning of period at Dec. 31, 2022 | $ 2,527,564 | $ 200,000 | 209,694 | 493,488 | 2,749,703 | (498,042) | (627,279)
Issuance of preferred stock |  | 0 |  |  |  |  |
Dividend reinvestment plan |  |  | 27 | 1,335 |  |  |
Stock purchase and compensation plans |  |  | 623 | 22,031 |  |  |
Net income | 240,390 |  |  |  | 240,390 |  |
Dividends to preferred stockholders |  |  |  |  | (6,900) |  |
Dividends to common stockholders |  |  |  |  | (55,016) |  |
Other comprehensive income (loss) | (77,827) |  |  |  |  | (77,827) |
Acquisition of treasury stock - share repurchase authorization |  |  |  |  |  |  | 0
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans |  |  |  |  |  |  | (7,804)
End of period at Sep. 30, 2023 | $ 2,644,423 | $ 200,000 | 210,344 | 516,854 | 2,928,177 | (575,869) | (635,083)
Dividends declared per preferred share (in dollars per share) | $ 862.50 |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.90 |  |  |  |  |  |
Issuance of preferred stock, shares |  | 0 |  |  |  |  |
Common stock, shares outstanding, beginning of period at Dec. 31, 2022 | 60,338,900 |  |  |  |  |  |
Dividend reinvestment plan, shares | 13,677 |  |  |  |  |  |
Stock purchase and compensation plan, shares | 311,214 |  |  |  |  |  |
Acquisition of treasury stock, share repurchase authorization, shares | 0 |  |  |  |  |  |
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares | (77,430) |  |  |  |  |  |
Common stock, shares outstanding, end of period at Sep. 30, 2023 | 60,586,361 |  |  |  |  |  |
Preferred stock, shares outstanding | 8,000 |  |  |  |  |  |
Beginning of period at Jun. 30, 2023 |  | $ 200,000 | 210,296 | 512,040 | 2,859,569 | (475,722) | (634,791)
Issuance of preferred stock |  | 0 |  |  |  |  |
Dividend reinvestment plan |  |  | 8 | 427 |  |  |
Stock purchase and compensation plans |  |  | 40 | 4,387 |  |  |
Net income | $ 89,208 |  |  |  | 89,208 |  |
Dividends to preferred stockholders |  |  |  |  | (2,300) |  |
Dividends to common stockholders |  |  |  |  | (18,300) |  |
Other comprehensive income (loss) | (100,147) |  |  |  |  | (100,147) |
Acquisition of treasury stock - share repurchase authorization |  |  |  |  |  |  | 0
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans |  |  |  |  |  |  | (292)
End of period at Sep. 30, 2023 | $ 2,644,423 | $ 200,000 | $ 210,344 | $ 516,854 | $ 2,928,177 | $ (575,869) | $ (635,083)
Dividends declared per preferred share (in dollars per share) | $ 287.50 |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.30 |  |  |  |  |  |
Issuance of preferred stock, shares |  | 0 |  |  |  |  |
Common stock, shares outstanding, beginning of period at Jun. 30, 2023 | 60,565,483 |  |  |  |  |  |
Dividend reinvestment plan, shares | 4,362 |  |  |  |  |  |
Stock purchase and compensation plan, shares | 19,475 |  |  |  |  |  |
Acquisition of treasury stock, share repurchase authorization, shares | 0 |  |  |  |  |  |
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans, shares | (2,959) |  |  |  |  |  |
Common stock, shares outstanding, end of period at Sep. 30, 2023 | 60,586,361 |  |  |  |  |  |
Preferred stock, shares outstanding | 8,000 |  |  |  |  |  |

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