CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative effect of the change in accounting principle	[1]	Common Stock	Additional Paid-in Capital	Accumulated Retained Earnings	Accumulated Retained Earnings Cumulative effect of the change in accounting principle	[1]	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2019	$ 2,012,594	$ (45,625)		$ 586	$ 1,594,434	$ 396,051	$ (45,625)		$ 21,523
Balance (in shares) at Dec. 31, 2019				59,506,057
Increase (Decrease) in Stockholders' Equity
Net income	25,740					25,740
Other comprehensive loss	22,886								22,886
Cash dividends declared	(14,882)					(14,882)
Dividend equivalents declared	0				42	(42)
Share-based compensation expense	2,309				2,309
Issuance of restricted stock, net	0
Issuance of restricted stock, net (in shares)				446,815
Restricted stock surrendered and canceled	(1,008)				(1,008)
Restricted stock surrendered and canceled (in shares)				(29,474)
Exercise of stock options	903				903
Exercise of stock options (in shares)				51,883
Balance at Mar. 31, 2020	2,002,917			$ 586	1,596,680	361,242			44,409
Balance (in shares) at Mar. 31, 2020				59,975,281
Balance at Dec. 31, 2020	$ 2,746,649			$ 931	2,354,871	330,555			60,292
Balance (in shares) at Dec. 31, 2020	94,483,136			94,483,136
Increase (Decrease) in Stockholders' Equity
Net income	$ 68,668					68,668
Other comprehensive loss	(75,481)								(75,481)
Repurchase and retirement of common stock	(6,897)			$ (2)	(4,977)	(1,918)
Repurchase and retirement of common stock (in shares)				(199,674)
Cash dividends declared	(28,287)					(28,287)
Dividend equivalents declared	0				107	(107)
Share-based compensation expense	3,105				3,105
Issuance of restricted stock, net				$ 2	(2)
Issuance of restricted stock, net	0
Issuance of restricted stock, net (in shares)				419,757
Restricted stock surrendered and canceled	(5,279)				(5,279)
Restricted stock surrendered and canceled (in shares)				(100,550)
Exercise of stock options	620				620
Exercise of stock options (in shares)				41,746
Balance at Mar. 31, 2021	$ 2,703,098			$ 931	$ 2,348,445	$ 368,911			$ (15,189)
Balance (in shares) at Mar. 31, 2021	94,644,415			94,644,415

[1] Related to the adoption of Accounting Standards Update 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.