Loans and Allowance for Credit Losses for Loans - Loans Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 32,314,611	$ 29,699,208
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,884,689	4,825,997
Loans, PPP	2,200,000
Loans, deferred income, PPP	62,100
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,293,229	17,643,759
Commercial real estate \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	16,571,877	15,996,741
Commercial real estate \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,721,352	1,647,018
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,405,147	4,377,111
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,731,546	2,852,341
Consumer loans \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	471,115	487,272
Consumer loans \| Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,369,489	1,451,623
Consumer loans \| Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 890,942	$ 913,446

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No definition available.

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- Definition

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.

+ References

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=118952595&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524

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Loans and Leases Receivable, Deferred Income, Paycheck Protection Program

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Loans and Leases Receivable, Net of Deferred Income, Paycheck Protection Program

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