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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Computation of basic and diluted EPS
The following tables show the computation of basic and diluted EPS for the three and six months ended June 30, 2021 and 2020.
Three Months Ended June 30,
 20212020
 Net Income
(Numerator)		Weighted-Average Shares
(Denominator)		Earnings
Per
Share		Net Income
(Numerator)		Weighted-Average Shares
(Denominator)		Earnings
Per
Share
 (Dollars in thousands, except share and per share data)
Basic EPS - common stock$53,763 123,592,695 $0.44 $26,753 123,200,127 $0.22 
Effect of dilutive securities:
Stock options, restricted stock,
and ESPP shares
731,193 230,764 
Diluted EPS - common stock$53,763 124,323,888 $0.43 $26,753 123,430,891 $0.22 
Six Months Ended June 30,
20212020
Net Income
(Numerator)		Weighted-Average Shares
(Denominator)		Earnings
Per
Share		Net Income
(Numerator)		Weighted-Average Shares
(Denominator)		Earnings
Per
Share
(Dollars in thousands, except share and per share data)
Basic EPS - common stock$97,450 123,459,461 $0.79 $52,706 123,747,727 $0.43 
Effect of dilutive securities:
Stock options, restricted stock,
and ESPP shares
874,766 306,564 
Diluted EPS - common stock$97,450 124,334,227 $0.78 $52,706 124,054,291 $0.42