The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Name:	us-gaap_RetainedEarningsAccumulatedDeficit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Current Accounting Developments and Summary of Significant Accounting Policies (Details) $ in Thousands	1 Months Ended
	Apr. 30, 2020	Sep. 30, 2020 USD ($) loan	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		$ 618,252		$ 358,287
Retained earnings		$ 3,875,715		$ 3,689,377
Commercial and industrial (“C&I”) \| CARES Act, Paycheck Protection Program Liquidity Facility
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest rate	1.00%
Number of loans funded \| loan		7,400
Outstanding loan balance		$ 1,770,000
ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			$ 125,200
Retained earnings			98,000
ASU 2016-13 \| Unfunded Credit Commitments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			$ 10,500