Condensed Consolidated Statements of Changes In Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	[1]	Common Stock	Retained Earnings (Accumulated Deficit)	Retained Earnings (Accumulated Deficit) Cumulative Effect, Period of Adoption, Adjustment	[1]	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2019				220,229,282
Beginning balance at Dec. 31, 2019	$ 4,313,915	$ (40,181)		$ 3,514,000	$ 770,366	$ (40,181)		$ 29,549
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,851,947)				(1,851,947)
Other comprehensive income (loss), net of tax	138,722							138,722
Stock-based compensation	2,253			$ 2,253
Stock repurchased and retired (in shares)				(486,757)
Stock repurchased and retired	(8,573)			$ (8,573)
Issuances of common stock under stock plans (in shares)				432,595
Issuances of common stock under stock plans	0			$ 0
Cash dividends on common stock	(46,578)				(46,578)
Ending balance (in shares) at Mar. 31, 2020				220,175,120
Ending balance at Mar. 31, 2020	2,507,611			$ 3,507,680	(1,168,340)			168,271
Beginning balance (in shares) at Dec. 31, 2019				220,229,282
Beginning balance at Dec. 31, 2019	4,313,915	$ (40,181)		$ 3,514,000	770,366	$ (40,181)		29,549
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,799,021)
Other comprehensive income (loss), net of tax	114,059
Ending balance (in shares) at Jun. 30, 2020				220,219,107
Ending balance at Jun. 30, 2020	2,538,339			$ 3,510,145	(1,115,414)			143,608
Beginning balance (in shares) at Mar. 31, 2020				220,175,120
Beginning balance at Mar. 31, 2020	2,507,611			$ 3,507,680	(1,168,340)			168,271
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	52,926				52,926
Other comprehensive income (loss), net of tax	(24,663)							(24,663)
Stock-based compensation	2,503			$ 2,503
Stock repurchased and retired (in shares)				(3,707)
Stock repurchased and retired	(38)			$ (38)
Issuances of common stock under stock plans (in shares)				47,694
Issuances of common stock under stock plans	0			$ 0
Ending balance (in shares) at Jun. 30, 2020				220,219,107
Ending balance at Jun. 30, 2020	2,538,339			$ 3,510,145	(1,115,414)			143,608
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	124,871				124,871
Other comprehensive income (loss), net of tax	(8,586)							(8,586)
Stock-based compensation	2,025			$ 2,025
Stock repurchased and retired (in shares)				(1,523)
Stock repurchased and retired	(17)			$ (17)
Issuances of common stock under stock plans (in shares)				4,614
Issuances of common stock under stock plans	0			$ 0
Cash dividends on common stock	(46,388)				(46,388)
Ending balance (in shares) at Sep. 30, 2020				220,222,198
Ending balance at Sep. 30, 2020	2,610,244			$ 3,512,153	(1,036,931)			135,022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	150,730				150,730
Other comprehensive income (loss), net of tax	(12,277)							(12,277)
Stock-based compensation	2,473			$ 2,473
Stock repurchased and retired (in shares)				(2,022)
Stock repurchased and retired	(27)			$ (27)
Issuances of common stock under stock plans (in shares)				6,159
Issuances of common stock under stock plans	0			$ 0
Cash dividends on common stock	$ (46,566)				(46,566)
Ending balance (in shares) at Dec. 31, 2020	220,226,335			220,226,335
Ending balance at Dec. 31, 2020	$ 2,704,577			$ 3,514,599	(932,767)			122,745
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	107,737				107,737
Other comprehensive income (loss), net of tax	(84,613)							(84,613)
Stock-based compensation	2,964			$ 2,964
Stock repurchased and retired (in shares)				(143,832)
Stock repurchased and retired	(2,315)			$ (2,315)
Issuances of common stock under stock plans (in shares)				408,700
Issuances of common stock under stock plans	0			$ 0
Cash dividends on common stock	(46,481)				(46,481)
Ending balance (in shares) at Mar. 31, 2021				220,491,203
Ending balance at Mar. 31, 2021	$ 2,681,869			$ 3,515,248	(871,511)			38,132
Beginning balance (in shares) at Dec. 31, 2020	220,226,335			220,226,335
Beginning balance at Dec. 31, 2020	$ 2,704,577			$ 3,514,599	(932,767)			122,745
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	223,880
Other comprehensive income (loss), net of tax	$ (72,116)
Ending balance (in shares) at Jun. 30, 2021	220,626,452			220,626,452
Ending balance at Jun. 30, 2021	$ 2,766,316			$ 3,517,641	(801,954)			50,629
Beginning balance (in shares) at Mar. 31, 2021				220,491,203
Beginning balance at Mar. 31, 2021	2,681,869			$ 3,515,248	(871,511)			38,132
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	116,143				116,143
Other comprehensive income (loss), net of tax	12,497							12,497
Stock-based compensation	2,377			$ 2,377
Stock repurchased and retired (in shares)				(957)
Stock repurchased and retired	(18)			$ (18)
Issuances of common stock under stock plans (in shares)				136,206
Issuances of common stock under stock plans	34			$ 34
Cash dividends on common stock	$ (46,586)				(46,586)
Ending balance (in shares) at Jun. 30, 2021	220,626,452			220,626,452
Ending balance at Jun. 30, 2021	$ 2,766,316			$ 3,517,641	$ (801,954)			$ 50,629

[1] The cumulative effect adjustment relates to the implementation of new accounting guidance for the allowance for credit losses on January 1, 2020.