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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Common Stock
Surplus
Retained Earnings
Cumulative Effect of Adoption of ASU
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Cumulative Effect of Adoption of ASU
Total
Balance at Dec. 31, 2019 $ 84,361 $ 1,607,740   $ 679,895 $ 1,017   $ 2,373,013
Balance (in shares) at Dec. 31, 2019 33,744,385            
Increase (Decrease) in Stockholders' Equity              
Net income       120,632     120,632
Other comprehensive loss, net of tax effects         46,572   46,572
Total comprehensive income (loss)             167,204
Cash dividends declared on common stock per share       (98,256)     (98,256)
Employee stock purchases $ 81 1,456         1,537
Employee stock purchases (in shares) 32,476            
Stock options exercised $ 131 1,550         1,681
Stock options exercised (in shares) 52,331            
Restricted stock awards (forfeitures), net $ 22 (22)          
Restricted stock awards (forfeitures), net (in shares) 8,828            
Stock issued pursuant to restricted stock units $ 768 (768)          
Stock issued pursuant to restricted stock units (in shares) 307,096            
Common stock repurchased - buyback plan $ (800) (23,915)         (24,715)
Common stock repurchased - buyback plan (in shares) (320,000)            
Common stock repurchased $ (307) (7,409)         (7,716)
Common stock repurchased (in shares) (122,708)            
Share-based compensation expense   23,318         23,318
Common stock issued for acquisition $ 93,178 2,153,149         2,246,327
Common stock issued for acquisition (in shares) 37,271,069            
Stock options and restricted stock acquired and converted pursuant to acquisition   10,307         10,307
Balance (ASU 2016-13) at Dec. 31, 2020     $ (44,820)     $ (44,820)  
Balance at Dec. 31, 2020 $ 177,434 3,765,406   657,451 47,589   4,647,880
Balance (in shares) at Dec. 31, 2020 70,973,477            
Increase (Decrease) in Stockholders' Equity              
Net income       475,543     475,543
Other comprehensive loss, net of tax effects         (68,735)   (68,735)
Total comprehensive income (loss)             406,808
Cash dividends declared on common stock per share       (135,201)     (135,201)
Cash dividends equivalents paid on restricted stock units       (136)     (136)
Employee stock purchases $ 83 2,301         2,384
Employee stock purchases (in shares) 33,013            
Stock options exercised $ 160 2,745         2,905
Stock options exercised (in shares) 64,075            
Stock issued pursuant to restricted stock units $ 233 (233)          
Stock issued pursuant to restricted stock units (in shares) 93,085            
Common stock repurchased - buyback plan $ (4,545) (141,823)         (146,368)
Common stock repurchased - buyback plan (in shares) (1,817,941)            
Common stock repurchased $ (34) (1,019)         (1,053)
Common stock repurchased (in shares) (13,412)            
Share-based compensation expense   25,721         25,721
Balance at Dec. 31, 2021 $ 173,331 3,653,098   997,657 (21,146)   $ 4,802,940
Balance (in shares) at Dec. 31, 2021 69,332,297           69,332,297
Increase (Decrease) in Stockholders' Equity              
Net income       496,049     $ 496,049
Other comprehensive loss, net of tax effects         (655,942)   (655,942)
Total comprehensive income (loss)             (159,893)
Cash dividends declared on common stock per share       (146,486)     (146,486)
Cash dividends equivalents paid on restricted stock units       (178)     (178)
Employee stock purchases $ 96 2,762         2,858
Employee stock purchases (in shares) 38,491            
Stock options exercised $ 97 1,488         1,585
Stock options exercised (in shares) 39,020            
Restricted stock awards (forfeitures), net $ (13) 13          
Restricted stock awards (forfeitures), net (in shares) (5,368)            
Stock issued pursuant to restricted stock units $ 984 (983)         1
Stock issued pursuant to restricted stock units (in shares) 393,747            
Common stock repurchased - buyback plan $ (3,280) (106,924)         (110,204)
Common stock repurchased - buyback plan (in shares) (1,312,038)            
Common stock repurchased $ (281) (8,845)         (9,126)
Common stock repurchased (in shares) (112,389)            
Share-based compensation expense   35,638         35,638
Common stock issued for acquisition $ 18,327 641,445         659,772
Common stock issued for acquisition (in shares) 7,330,803            
Stock options and restricted stock acquired and converted pursuant to acquisition   (1,980)         (1,980)
Balance at Dec. 31, 2022 $ 189,261 $ 4,215,712   $ 1,347,042 $ (677,088)   $ 5,074,927
Balance (in shares) at Dec. 31, 2022 75,704,563           75,704,563