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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of basic and diluted earnings per share
Calculation of basic earnings per share (Basic EPS) and diluted earnings per share (Diluted EPS) is shown below.
Year ended December 31,
(In thousands, except share and per share data)202020192018
Basic
Net income available to common shareholders$77,588 $81,718 $82,308 
Less: income attributable to unvested stock-based compensation awards(857)(1,306)(1,315)
Net earnings allocated to common shareholders76,731 80,412 80,993 
Weighted average shares outstanding, including unvested stock-based compensation awards14,933,990 15,149,535 15,283,914 
Less: average unvested stock-based compensation awards(230,600)(242,478)(244,685)
Weighted average shares outstanding - Basic14,703,390 14,907,057 15,039,229 
Diluted
Net earnings allocated to common shareholders76,731 80,412 80,993 
Weighted average shares outstanding - Basic14,703,390 14,907,057 15,039,229 
Plus: incremental shares from assumed conversion of stock-based compensation awards38,650 66,894 93,028 
   Weighted average shares outstanding - Diluted14,742,040 14,973,951 15,132,257 
Basic EPS$5.22 $5.39 $5.39 
Diluted EPS$5.20 $5.37 $5.35