Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Deposit Account Charges and Other Fees) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deposit Account Charges and Other Fees [Line Items]
Fees and Commissions, Depositor Accounts (Deprecated 2018-01-31)	$ 94,517	$ 90,060	$ 86,394
Corporate Cash Management [Member]
Deposit Account Charges and Other Fees [Line Items]
Fees and Commissions, Depositor Accounts (Deprecated 2018-01-31)	38,468	36,044	36,131
Overdraft and Return Item [Member]
Deposit Account Charges and Other Fees [Line Items]
Fees and Commissions, Depositor Accounts (Deprecated 2018-01-31)	31,468	30,576	29,350
Other Deposit Account Charges [Member]
Deposit Account Charges and Other Fees [Line Items]
Fees and Commissions, Depositor Accounts (Deprecated 2018-01-31)	$ 24,581	$ 23,440	$ 20,913