Commitments and Contingent Liabilities (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Other Commitments [Abstract]
The Net Asset Value of Units in Mutual Funds (per unit)	1.00
Minimum Average Cash Balance Required to be Maintained at Federal Reserve by Subsidiary Bank	$ 1,900,000,000	$ 1,800,000,000
Operating Leases, Rent Expense, Net [Abstract]
Operating Leases, Rent Expense, Net	25,800,000	$ 25,200,000	$ 25,000,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments, Due in 2017	22,500,000
Operating Leases, Future Minimum Payments, Due in 2018	20,100,000
Operating Leases, Future Minimum Payments, Due in 2019	19,600,000
Operating Leases, Future Minimum Payments, Due in 2020	16,200,000
Operating Leases, Future Minimum Payments, Due in 2021	13,400,000
Operating Leases, Future Minimum Payments, Due Thereafter	$ 56,800,000
Visa Membership [Member]
Loss Contingencies [Line Items]
Number of Visa Class B Shares Owned by Entity (in shares) | shares	252,233
Number of Visa Class A Shares Visa Class B Shares Are Convertible To (in shares) | shares	415,755
Deposit Account Posting Class Action [Member] | Settled Litigation [Member]
Litigation Settlement [Abstract]
Litigation Settlement, Amount	$ 7,800,000
Misuse of Revenues Pledged to Municipal Bonds [Member] | Judicial Ruling [Member]
Litigation Settlement [Abstract]
Litigation Settlement, Amount	600,000
Outstanding principal, accrued interest and other amounts required by bond documents	73,000,000
Disgorged fees	$ 1,067,721
Misuse of Revenues Pledged to Municipal Bonds [Member] | Pending Litigation [Member]
Litigation Settlement [Abstract]
Loss Contingency, Number of Plaintiffs	2
Bank Participation in Fraudulent Sale of Securities by Principals [Member] | Pending Litigation [Member]
Litigation Settlement [Abstract]
Loss Contingency, Number of Plaintiffs	19
Municipal Bond Purchase by Elected Treasurer [Member] | Settled Litigation [Member]
Litigation Settlement [Abstract]
Litigation Settlement, Amount	$ 125,000
Municipal Bond Purchase by Elected Treasurer [Member] | Pending Litigation [Member]
Litigation Settlement [Abstract]
Loss Contingency, Damages Sought, Value	$ 5,600,000