Loans - Accrued Interest (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest	$ 92,062
Allowance for Credit Losses on COVID-19 Deferrals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest	(860)
Commercial | Commercial, financial, and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest	56,828
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest	16,528
Consumer | Consumer Real Estate (a)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest	18,020
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest	$ 1,546