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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2022
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 nine months ended September 30, 2022 and 2021.
Three Months Ended September 30,
 20222021
 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$53,748 119,476,035 $0.45 $55,499 122,244,948 $0.45 
Effect of dilutive securities:
Stock options, restricted stock,
and ESPP shares
520,488 663,588 
Diluted EPS - common stock$53,748 119,996,523 $0.45 $55,499 122,908,536 $0.45 
Nine Months Ended September 30,
20222021
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$166,574 119,940,044 $1.39 $152,949 123,050,174 $1.24 
Effect of dilutive securities:
Stock options, restricted stock,
and ESPP shares
655,944 798,338 
Diluted EPS - common stock$166,574 120,595,988 $1.38 $152,949 123,848,512 $1.23