Goodwill and Intangible Assets (Summary of Estimated Future Amortization Expense of Core Deposit Intangibles) (Details) (Core Deposits [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Core Deposits [Member]
Future Amortization Expense For Core Deposit Intangibles
2013	$ 3,964
2014	3,397
2015	2,645
2016	2,184
2017	$ 1,627

No authoritative reference available.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

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