Loans and Leases (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Loans and leases, deferred fees and costs	$ 47,000	$ 26,300
Total loans pledged to secure borrowings	9,900,000
Discounts on acquired loans	105,600	236,600
Outstanding contractual unpaid principal balance of non-covered purchased impaired loans	540,400	770,900
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired with deteriorated credit quality	705,896	508,745
Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired with deteriorated credit quality	$ 438,104	$ 562,851