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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Preferred stock | Common stock | Surplus | Treasury stock | Retained earnings | Retained earnings Cumulative Effect, Period of Adoption, Adjustment | Accumulated other comprehensive income (loss)
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2021 | $ 4,498,688 |  | $ 412,500 | $ 58,892 | $ 1,685,572 | $ (109,903) | $ 2,447,535 |  | $ 4,092
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income | 364,865 |  |  |  |  |  | 364,865 |  |
Other comprehensive loss, net of tax | (462,820) |  |  |  |  |  |  |  | (462,820)
Cash dividends declared on common stock | (59,583) |  |  |  |  |  | (59,583) |  |
Dividends on Series D and E preferred stock | (20,973) |  |  |  |  |  | (20,973) |  |
Stock-based compensation | 23,852 |  |  |  | 23,852 |  |  |  |
Common stock issued for: |  |  |  |  |  |  |  |  |
New Issuance, net of cost | 285,721 |  |  | 1,612 | 174,206 | 109,903 |  |  |
Exercise of stock options | 3,738 |  |  | 88 | 3,650 |  |  |  |
Restricted stock awards | 0 |  |  | 61 | (61) |  |  |  |
Employee stock purchase plan | 2,529 |  |  | 31 | 2,498 |  |  |  |
Director compensation plan | 1,963 |  |  | 59 | 1,904 |  |  |  |
Ending balance at Sep. 30, 2022 | 4,637,980 |  | 412,500 | 60,743 | 1,891,621 | 0 | 2,731,844 |  | (458,728)
Beginning balance at Dec. 31, 2021 | 4,498,688 |  | 412,500 | 58,892 | 1,685,572 | (109,903) | 2,447,535 |  | 4,092
Ending balance at Dec. 31, 2022 | $ 4,796,838 | $ (544) | 412,500 | 60,797 | 1,902,474 | (304) | 2,849,007 | $ (544) | (427,636)
Common stock issued for: |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible Enumeration] | Accounting Standards Update 2022-02 | Accounting Standards Update 2022-02 |  |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2022 | $ 4,727,623 |  | 412,500 | 60,722 | 1,880,913 | 0 | 2,616,525 |  | (243,037)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income | 142,961 |  |  |  |  |  | 142,961 |  |
Other comprehensive loss, net of tax | (215,691) |  |  |  |  |  |  |  | (215,691)
Cash dividends declared on common stock | (20,651) |  |  |  |  |  | (20,651) |  |
Dividends on Series D and E preferred stock | (6,991) |  |  |  |  |  | (6,991) |  |
Stock-based compensation | 8,963 |  |  |  | 8,963 |  |  |  |
Common stock issued for: |  |  |  |  |  |  |  |  |
Exercise of stock options | 198 |  |  | 4 | 194 |  |  |  |
Restricted stock awards | 0 |  |  | 5 | (5) |  |  |  |
Employee stock purchase plan | 894 |  |  | 12 | 882 |  |  |  |
Director compensation plan | 674 |  |  |  | 674 |  |  |  |
Ending balance at Sep. 30, 2022 | 4,637,980 |  | 412,500 | 60,743 | 1,891,621 | 0 | 2,731,844 |  | (458,728)
Beginning balance at Dec. 31, 2022 | 4,796,838 | $ (544) | 412,500 | 60,797 | 1,902,474 | (304) | 2,849,007 | $ (544) | (427,636)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income | 499,146 |  |  |  |  |  | 499,146 |  |
Other comprehensive loss, net of tax | (215,087) |  |  |  |  |  |  |  | (215,087)
Cash dividends declared on common stock | (73,304) |  |  |  |  |  | (73,304) |  |
Dividends on Series D and E preferred stock | (20,973) |  |  |  |  |  | (20,973) |  |
Stock-based compensation | 24,532 |  |  |  | 24,532 |  |  |  |
Common stock issued for: |  |  |  |  |  |  |  |  |
Exercise of stock options | 2,216 |  |  | 54 | 2,162 |  |  |  |
Restricted stock awards | (1,662) |  |  | 296 | (296) | (1,662) |  |  |
Employee stock purchase plan | 2,418 |  |  | 34 | 2,384 |  |  |  |
Director compensation plan | 2,033 |  |  | 63 | 1,970 |  |  |  |
Ending balance at Sep. 30, 2023 | 5,015,613 |  | 412,500 | 61,244 | 1,933,226 | (1,966) | 3,253,332 |  | (642,723)
Beginning balance at Jun. 30, 2023 | 5,041,912 |  | 412,500 | 61,219 | 1,923,623 | (1,966) | 3,120,626 |  | (474,090)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income | 164,198 |  |  |  |  |  | 164,198 |  |
Other comprehensive loss, net of tax | (168,633) |  |  |  |  |  |  |  | (168,633)
Cash dividends declared on common stock | (24,501) |  |  |  |  |  | (24,501) |  |
Dividends on Series D and E preferred stock | (6,991) |  |  |  |  |  | (6,991) |  |
Stock-based compensation | 8,130 |  |  |  | 8,130 |  |  |  |
Common stock issued for: |  |  |  |  |  |  |  |  |
Restricted stock awards | 0 |  |  | 13 | (13) |  |  |  |
Employee stock purchase plan | 816 |  |  | 12 | 804 |  |  |  |
Director compensation plan | 682 |  |  |  | 682 |  |  |  |
Ending balance at Sep. 30, 2023 | $ 5,015,613 |  | $ 412,500 | $ 61,244 | $ 1,933,226 | $ (1,966) | $ 3,253,332 |  | $ (642,723)

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