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Regulatory Capital - Additional Information (Details)		3 Months Ended		9 Months Ended
	Jan. 01, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Allowance for credit losses on loans and leases	$ 441,912,000	$ 1,734,559,000	$ 414,406,000	$ 1,734,559,000	$ 414,406,000	$ 1,929,323,000	$ 441,912,000	$ 383,997,000	$ 341,121,000
Allowance for credit losses on unfunded commitments	$ 2,481,000
Dividends		$ 0	$ 20,000,000	$ 568,000,000	$ 241,000,000
Accounting Standards Update 2016-13
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Period of deferment	2
Amount deferred	25.00%
Allowance for credit losses on loans and leases	$ 1,100,000,000
Allowance for credit losses on unfunded commitments	116,000,000
Deferred tax assets	306,000,000
Reduction to retained earnings	$ 953,000,000

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