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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2022
Earnings Per Share [Abstract]  
Components of Calculation of Earnings Per Share The components of the calculation of earnings per share were as follows:
202220212020
 (Dollars and shares in thousands)
Net income$340,848 $359,081 $308,722 
Weighted average number of shares used in:
Basic earnings per share110,465 110,396 110,768 
Dilutive common stock equivalents:
Restricted stock units566 770 625 
Diluted earnings per share111,031 111,166 111,393