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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted
The computation of per share earnings is as follows: 
(In thousands, except per share data)
 
2018
 
2017
 
2016
Net income available to common shareholders
 
$
215,713

 
$
92,940

 
$
96,790

 
 
 
 
 
 
 
Average common shares outstanding
 
92,268

 
69,385

 
61,291

Average potential dilutive common shares
 
562

 
468

 
636

Average diluted common shares
 
92,830

 
69,853

 
61,927

 
 
 
 
 
 
 
Basic earnings per share
 
$
2.34

 
$
1.34

 
$
1.58

Diluted earnings per share
 
$
2.32

 
$
1.33

 
$
1.56