Loans and Leases (Troubled Debt Restructurings) (Details) - Lease Financing, net $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) Contract	Jun. 30, 2015 USD ($) Contract	Jun. 30, 2016 USD ($) Contract	Jun. 30, 2015 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract	24	21,000,000	55	80,000,000
Recorded Investment	$ 6.9	$ 9.2	$ 21.9	$ 17.1
Unpaid Principal Balance	$ 7.4	$ 10.1	$ 27.3	$ 21.1
Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract	3	1,000,000	10	3,000,000
Recorded Investment	$ 1.9	$ 0.1	$ 11.4	$ 0.9
Unpaid Principal Balance	$ 2.0	$ 0.1	$ 15.7	$ 0.9
Commercial | Commercial and Institutional
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract	2	1,000,000	4	2,000,000
Recorded Investment	$ 0.1	$ 0.1	$ 4.1	$ 0.1
Unpaid Principal Balance	$ 0.2	$ 0.1	$ 6.2	$ 0.1
Commercial | Real Estate
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract	1	0	6	1,000,000
Recorded Investment	$ 1.8	$ 0.0	$ 7.3	$ 0.8
Unpaid Principal Balance	$ 1.8	$ 0.0	$ 9.5	$ 0.8
Personal
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract	21	20,000,000	45	77,000,000
Recorded Investment	$ 5.0	$ 9.1	$ 10.5	$ 16.2
Unpaid Principal Balance	$ 5.4	$ 10.0	$ 11.6	$ 20.2
Personal | Real Estate
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract	20	19,000,000	44	76,000,000
Recorded Investment	$ 3.0	$ 8.5	$ 8.5	$ 15.6
Unpaid Principal Balance	$ 3.4	$ 9.4	$ 9.6	$ 19.6
Personal | Private Client
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract	1	1,000,000	1	1,000,000
Recorded Investment	$ 2.0	$ 0.6	$ 2.0	$ 0.6
Unpaid Principal Balance	$ 2.0	$ 0.6	$ 2.0	$ 0.6