Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Core Deposits Member
Estimated future amortization expense
Three months ending December 31, 2012	$ 800
Year ending December 31, 2013	3,100
Year ending December 31, 2014	2,900
Year ending December 31, 2015	1,400
Year ending December 31, 2016	300
Year ending December 31, 2017	100
Other Intangible Assets [Member]
Estimated future amortization expense
Three months ending December 31, 2012	200
Year ending December 31, 2013	900
Year ending December 31, 2014	900
Year ending December 31, 2015	800
Year ending December 31, 2016	800
Year ending December 31, 2017	800
Mortgage Service Rights [Member]
Estimated future amortization expense
Three months ending December 31, 2012	4,500
Year ending December 31, 2013	14,200
Year ending December 31, 2014	10,200
Year ending December 31, 2015	7,700
Year ending December 31, 2016	5,900
Year ending December 31, 2017	$ 4,500

Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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