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Condensed 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 (ASU 2016-13) at Dec. 31, 2019     $ (44,820)     $ (44,820)  
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       24,110     24,110
Other comprehensive income (loss), net of tax effects         8,748   8,748
Total comprehensive income             32,858
Cash dividends declared on common stock per share       (15,840)     (15,840)
Stock options exercised $ 31 372         403
Stock options exercised (in shares) 12,485            
Restricted stock awards (forfeitures) $ 1 (1)          
Restricted stock awards (forfeitures) (in shares) 498            
Stock issued pursuant to restricted stock units $ 79 (79)          
Stock issued pursuant to restricted stock units (in shares) 31,435            
Common stock repurchased - buyback plan $ (800) (23,914)         (24,714)
Common stock repurchased - buyback plan (in shares) (320,000)            
Common stock repurchased $ (61) (1,803)         (1,864)
Common stock repurchased (in shares) (24,567)            
Share-based compensation expense   2,007         2,007
Balance at Mar. 31, 2020 $ 83,611 1,584,322   643,345 9,765   2,321,043
Balance (in shares) at Mar. 31, 2020 33,444,236            
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           70,973,477
Increase (Decrease) in Stockholders' Equity              
Net income       146,949     $ 146,949
Other comprehensive income (loss), net of tax effects         (48,620)   (48,620)
Total comprehensive income             98,329
Cash dividends declared on common stock per share       (33,380)     (33,380)
Cash dividends equivalents paid on restricted stock units       (68)     (68)
Stock options exercised $ 94 1,677         1,771
Stock options exercised (in shares) 37,854            
Stock issued pursuant to restricted stock units $ 149 (149)          
Stock issued pursuant to restricted stock units (in shares) 59,462            
Common stock repurchased $ (26) (778)         (804)
Common stock repurchased (in shares) (10,347)            
Share-based compensation expense   6,092         6,092
Balance at Mar. 31, 2021 $ 177,651 $ 3,772,248   $ 770,952 $ (1,031)   $ 4,719,820
Balance (in shares) at Mar. 31, 2021 71,060,446           71,060,446