Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

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)	2020		2019		2018
Net income available to common stockholders	$	254,852	$	237,828	$	215,713
Average common shares outstanding	109,860		98,351		92,268
Average potential dilutive common shares	313		446		562
Average diluted common shares	110,173		98,797		92,830
Basic earnings per share	$	2.32	$	2.42	$	2.34
Diluted earnings per share	$	2.31	$	2.41	$	2.32