Loans and Leases and the Allowance for Loan and Lease Losses (Foreclosure Proceedings Narrative) (Details 8) $ in Millions	Mar. 31, 2018 USD ($)
Loans and Leases and Allowance for Loan and Lease Losses [Abstract]
Consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure	$ 3.9

Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL49126937-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant