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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Three Months Ended June 30,Six Months Ended June 30,
(Dollars in thousands, except per share data)2020201920202019
Basic earnings per share  
Net income$25,080  $23,253  $25,789  $45,958  
Average common shares outstanding52,985  51,446  52,394  51,403  
Net income per share$0.47  $0.45  $0.49  $0.89  
Diluted earnings per share
Net income$25,080  $23,253  $25,789  $45,958  
Average common shares outstanding52,985  51,446  52,394  51,403  
Add: Dilutive effect of employee restricted stock and stock options323  506  413  595  
Average diluted shares outstanding53,308  51,952  52,807  51,998  
Net income per share$0.47  $0.45  $0.49  $0.88