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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2013 $ 771,887 $ 491,068 $ 290,149 $ (9,330)
Beginning balance, shares at Dec. 31, 2013   105,370    
Repurchase of common stock (5,474) $ (5,474)    
Repurchase of common stock, shares   (384)    
Exercise of stock options 5,522 $ 5,522    
Exercise of stock options, shares   512    
Tax benefit from exercise of stock options 1,116 $ 1,116    
Shares issued pursuant to stock-based compensation plan 2,988 $ 2,988    
Shares issued pursuant to stock-based compensation plan, shares   395    
Cash dividends declared on common stock (42,356)   (42,356)  
Net earnings 104,021   104,021  
Other comprehensive income (loss) 40,405     40,405
Ending balance at Dec. 31, 2014 878,109 $ 495,220 351,814 31,075
Ending balance, shares at Dec. 31, 2014   105,893    
Repurchase of common stock (834) $ (834)    
Repurchase of common stock, shares   (54)    
Exercise of stock options 5,144 $ 5,144    
Exercise of stock options, shares   449    
Tax benefit from exercise of stock options 308 $ 308    
Shares issued pursuant to stock-based compensation plan 2,733 $ 2,733    
Shares issued pursuant to stock-based compensation plan, shares   97    
Cash dividends declared on common stock (51,040)   (51,040)  
Net earnings 99,145   99,145  
Other comprehensive income (loss) (10,166)     (10,166)
Ending balance at Dec. 31, 2015 923,399 $ 502,571 399,919 20,909
Ending balance, shares at Dec. 31, 2015   106,385    
Repurchase of common stock (1,907) $ (1,907)    
Repurchase of common stock, shares   (116)    
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 $ 5,151 $ 5,151    
Exercise of stock options, shares 483 483    
Tax benefit from exercise of stock options $ 932 $ 932    
Shares issued pursuant to stock-based compensation plan 2,803 $ 2,803    
Shares issued pursuant to stock-based compensation plan, shares   106    
Cash dividends declared on common stock (51,849)   (51,849)  
Net earnings 101,429   101,429  
Other comprehensive income (loss) (10,738)     (10,738)
Ending balance at Dec. 31, 2016 $ 990,862 $ 531,192 $ 449,499 $ 10,171
Ending balance, shares at Dec. 31, 2016   108,252