Leases (Balance Sheet Classification) (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 103,894
Total lease assets	111,826
Operating lease liabilities	112,142
Finance lease liabilities	5,356
Total lease liabilities	117,498
Operating lease right-of use assets
Lessee, Lease, Description [Line Items]
Operating lease assets	103,894
Premises and equipment
Lessee, Lease, Description [Line Items]
Finance lease assets	7,932
Operating lease liabilities
Lessee, Lease, Description [Line Items]
Operating lease liabilities	112,142
Long-term debt and finance lease liabilities
Lessee, Lease, Description [Line Items]
Finance lease liabilities	$ 5,356