Loans and Leases (Purchased impaired loans (in text)) (Details) - USD ($) $ in Millions	Sep. 11, 2015	Aug. 21, 2015	Jan. 16, 2015
Community Banc-Corp of Sheboygan, Inc.
Financing Receivable, Impaired [Line Items]
Loans			$ 413.4
Estimated fair value of loans acquired			$ 395.0
Community Bancorporation of New Mexico, Inc.
Financing Receivable, Impaired [Line Items]
Loans		$ 103.7
Estimated fair value of loans acquired		$ 99.5
First Scottsdale Bank, N.A.
Financing Receivable, Impaired [Line Items]
Loans	$ 56.5
Estimated fair value of loans acquired	$ 54.7