Loans and Leases (Narrative) (Details) (USD $)	3 Months Ended
Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Noncovered loans pledged to secure debt obligations	$ 2,570,000,000	$ 2,560,000,000
Charge off of past due business credit card loans (days)	120 days
Acquired	1,270,818,000	1,029,426,000
Ungraded
Financing Receivable, Recorded Investment [Line Items]
Acquired	139,922,000	19,676,000
1st Financial \| Ungraded
Financing Receivable, Recorded Investment [Line Items]
Acquired	$ 122,200,000

The fair value, as of the date of each statement of financial position presented, of loans which are owned but transferred to serve as collateral for the payment of other debt obligations, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728

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