Goodwill and Other Intangible Assets (Goodwill and Other Intangible Assets) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Goodwill	$ 528,072	$ 527,684	$ 527,684
Other intangible assets	12,764	14,335	16,828
Core Deposits [Member]
Other intangible assets	9,991	11,819
Customer Relationship [Member]
Other intangible assets	2,438	2,253
Non-compete Agreements [Member]
Other intangible assets	$ 335	$ 263

Carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant