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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Beginning balance at Dec. 31, 2014 $ 878,109 $ 495,220 $ 351,814 $ 31,075
Beginning balance, shares at Dec. 31, 2014   105,893    
Repurchase of common stock (606) $ (606)    
Repurchase of common stock, shares   (41)    
Exercise of stock options 4,672 $ 4,672    
Exercise of stock options, shares   411    
Tax benefit from exercise of stock options 772 $ 772    
Shares issued pursuant to stock-based compensation plan 2,044 $ 2,044    
Shares issued pursuant to stock-based compensation plan, shares   92    
Cash dividends declared on common stock (38,274)   (38,274)  
Net earnings 70,532   70,532  
Other comprehensive income 3,478     3,478
Ending balance at Sep. 30, 2015 920,727 $ 502,102 384,072 34,553
Ending balance, shares at Sep. 30, 2015   106,355    
Beginning balance at Dec. 31, 2015 923,399 $ 502,571 399,919 20,909
Beginning balance, shares at Dec. 31, 2015   106,385    
Repurchase of common stock (496) $ (496)    
Repurchase of common stock, shares   (66)    
Issuance of common stock for acquisition of County Commerce Bank 21,642 $ 21,642    
Issuance of common stock for acquisition of County Commerce Bank, Shares   1,394    
Exercise of stock options 3,174 $ 3,174    
Exercise of stock options, shares   274    
Tax benefit from exercise of stock options 236 $ 236    
Shares issued pursuant to stock-based compensation plan 2,154 $ 2,154    
Shares issued pursuant to stock-based compensation plan, shares   110    
Cash dividends declared on common stock (38,853)   (38,853)  
Net earnings 74,353   74,353  
Other comprehensive income 17,694     17,694
Ending balance at Sep. 30, 2016 $ 1,003,303 $ 529,281 $ 435,419 $ 38,603
Ending balance, shares at Sep. 30, 2016   108,097