Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

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)	2021		2020		2019
Net income available to common stockholders	$	271,109	$	254,852	$	237,828
Average common shares outstanding	109,577		109,860		98,351
Average potential dilutive common shares	621		313		446
Average diluted common shares	110,198		110,173		98,797
Basic earnings per share	$	2.47	$	2.32	$	2.42
Diluted earnings per share	$	2.46	$	2.31	$	2.41