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Loans and Allowance for Loan Losses - CARES Act Narrative (Details) $ in Thousands	Jul. 10, 2020 USD ($) loan	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payroll Protection Program loans		$ 2,110,201	$ 1,843,286
Commercial loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payroll Protection Program loans		525,117	$ 246,687
Commercial loans | Commercial and industrial | SBA PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payroll Protection Program loans		$ 298,900
Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan modifications under CARES Act | loan	260
Payment deferral period, loans modified under CARES Act	120 days
Total loan balance modified under CARES Act	$ 386,000

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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