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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Basic and diluted earnings per share
Basic and diluted earnings per share has been computed based on the following:

 Three Months ended
(Dollars in thousands, except per share data)March 31,
2020
March 31,
2019
Net income available to common stockholders, basic and diluted
$43,339  49,132  
Average outstanding shares - basic93,287,670  84,549,974  
Add: dilutive restricted stock units and stock options
72,122  64,274  
Average outstanding shares - diluted93,359,792  84,614,248  
Basic earnings per share$0.46  0.58  
Diluted earnings per share$0.46  0.58  
Restricted stock units and stock options excluded from the
  diluted average outstanding share calculation 1
102,094  —  
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1 Anti-dilution occurs when the unrecognized compensation cost per share of a restricted stock unit or the exercise price of a stock option exceeds the market price of the Company’s stock.