Condensed Consolidated Statements of Changes In Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment		Common Stock	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment		Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative adjustment	$ 4,056,442	$ (244)	[1]	$ 3,512,874	$ 602,482	$ (244)	[1]	$ (58,914)
Beginning balance (in shares) at Dec. 31, 2018				220,255,039
Beginning balance at Dec. 31, 2018	4,056,442	(244)	[1]	$ 3,512,874	602,482	(244)	[1]	(58,914)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	74,033				74,033
Other comprehensive income, net of tax	29,632							29,632
Stock-based compensation	754			$ 754
Stock repurchased and retired (in shares)				(108,088)
Stock repurchased and retired	(1,918)			$ (1,918)
Issuances of common stock under stock plans (in shares)				310,257
Issuances of common stock under stock plans	21			$ 21
Cash dividends on common stock	$ (46,394)				(46,394)
Cash dividends on common stock (in dollars per share)	$ 0.21
Cumulative adjustment	$ 4,112,326	(244)	[1]	$ 3,511,731	629,877	(244)	[1]	(29,282)
Ending balance (in shares) at Mar. 31, 2019				220,457,208
Ending balance at Mar. 31, 2019	$ 4,112,326			$ 3,511,731	629,877			(29,282)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201601Member
Beginning balance (in shares) at Dec. 31, 2018				220,255,039
Beginning balance at Dec. 31, 2018	$ 4,056,442	(244)	[1]	$ 3,512,874	602,482	(244)	[1]	(58,914)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	270,345
Other comprehensive income, net of tax	103,878
Cumulative adjustment	4,289,516	(244)	[1]	$ 3,511,493	733,059	(244)	[1]	44,964
Ending balance (in shares) at Sep. 30, 2019				220,212,134
Ending balance at Sep. 30, 2019	4,289,516			$ 3,511,493	733,059			44,964
Beginning balance (in shares) at Dec. 31, 2018				220,255,039
Beginning balance at Dec. 31, 2018	4,056,442	(244)	[1]	$ 3,512,874	602,482	(244)	[1]	(58,914)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative adjustment	$ 4,313,915	(40,181)	[2]	$ 3,514,000	770,366	(40,181)	[2]	29,549
Ending balance (in shares) at Dec. 31, 2019	220,229,282			220,229,282
Ending balance at Dec. 31, 2019	$ 4,313,915	(40,181)	[2]	$ 3,514,000	770,366	(40,181)	[2]	29,549
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Cumulative adjustment	$ 4,112,326			$ 3,511,731	629,877			(29,282)
Beginning balance (in shares) at Mar. 31, 2019				220,457,208
Beginning balance at Mar. 31, 2019	4,112,326			$ 3,511,731	629,877			(29,282)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	111,810				111,810
Other comprehensive income, net of tax	48,395							48,395
Stock-based compensation	2,722			$ 2,722
Stock repurchased and retired (in shares)				(4,113)
Stock repurchased and retired	(62)			$ (62)
Issuances of common stock under stock plans (in shares)				45,589
Issuances of common stock under stock plans	0			$ 0
Cash dividends on common stock	$ (46,684)				(46,684)
Cash dividends on common stock (in dollars per share)	$ 0.21
Cumulative adjustment	$ 4,228,507			$ 3,514,391	695,003			19,113
Ending balance (in shares) at Jun. 30, 2019				220,498,684
Ending balance at Jun. 30, 2019	4,228,507			$ 3,514,391	695,003			19,113
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative adjustment	4,228,507			3,514,391	695,003			19,113
Net (loss) income	84,502				84,502
Other comprehensive income, net of tax	25,851							25,851
Stock-based compensation	2,350			$ 2,350
Stock repurchased and retired (in shares)				(300,719)
Stock repurchased and retired	(5,248)			$ (5,248)
Issuances of common stock under stock plans (in shares)				14,169
Issuances of common stock under stock plans	0			$ 0
Cash dividends on common stock	$ (46,446)				(46,446)
Cash dividends on common stock (in dollars per share)	$ 0.21
Cumulative adjustment	$ 4,289,516			$ 3,511,493	733,059			44,964
Ending balance (in shares) at Sep. 30, 2019				220,212,134
Ending balance at Sep. 30, 2019	4,289,516			$ 3,511,493	733,059			44,964
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative adjustment	4,289,516			3,511,493	733,059			44,964
Net (loss) income	83,750				83,750
Other comprehensive income, net of tax	(15,415)							(15,415)
Stock-based compensation	2,547			$ 2,547
Stock repurchased and retired (in shares)				(2,483)
Stock repurchased and retired	(40)			$ (40)
Issuances of common stock under stock plans (in shares)				19,631
Issuances of common stock under stock plans	0			$ 0
Cash dividends on common stock	$ (46,443)				(46,443)
Cash dividends on common stock (in dollars per share)	$ 0.21
Cumulative adjustment	$ 4,313,915	(40,181)	[2]	$ 3,514,000	770,366	(40,181)	[2]	29,549
Ending balance (in shares) at Dec. 31, 2019	220,229,282			220,229,282
Ending balance at Dec. 31, 2019	$ 4,313,915	(40,181)	[2]	$ 3,514,000	770,366	(40,181)	[2]	29,549
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative adjustment	4,313,915	(40,181)	[2]	3,514,000	770,366	(40,181)	[2]	29,549
Net (loss) income	(1,851,947)				(1,851,947)
Other comprehensive income, 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)
Cash dividends on common stock (in dollars per share)	$ 0.21
Cumulative adjustment	$ 2,507,611	(40,181)	[2]	$ 3,507,680	(1,168,340)	(40,181)	[2]	168,271
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance (in shares) at Dec. 31, 2019	220,229,282			220,229,282
Beginning balance at Dec. 31, 2019	$ 4,313,915	(40,181)	[2]	$ 3,514,000	770,366	(40,181)	[2]	29,549
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(1,674,150)
Other comprehensive income, net of tax	105,473
Cumulative adjustment	$ 2,610,244	$ (40,181)	[2]	$ 3,512,153	(1,036,931)	$ (40,181)	[2]	135,022
Ending balance (in shares) at Sep. 30, 2020	220,222,198			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]
Cumulative adjustment	2,507,611			$ 3,507,680	(1,168,340)			168,271
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 (loss) income	52,926				52,926
Other comprehensive income, 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
Cumulative adjustment	2,538,339			$ 3,510,145	(1,115,414)			143,608
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]
Cumulative adjustment	2,538,339			3,510,145	(1,115,414)			143,608
Net (loss) income	124,871				124,871
Other comprehensive income, 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)
Cash dividends on common stock (in dollars per share)	$ 0.21
Cumulative adjustment	$ 2,610,244			$ 3,512,153	(1,036,931)			135,022
Ending balance (in shares) at Sep. 30, 2020	220,222,198			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]
Cumulative adjustment	$ 2,610,244			$ 3,512,153	$ (1,036,931)			$ 135,022

[1] The cumulative effect adjustment relates to the implementation of new accounting guidance for leases on January 1, 2019.

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