Goodwill and Other Intangible Assets Estimated Future Amortization Expense (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Core Deposits Member
Estimated future amortization expense
Six months ending December 31, 2013	$ 1,500
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
Year ending December 31, 2018	0
Other Intangible Assets [Member]
Estimated future amortization expense
Six months ending December 31, 2013	500
Year ending December 31, 2014	900
Year ending December 31, 2015	800
Year ending December 31, 2016	800
Year ending December 31, 2017	800
Year ending December 31, 2018	700
Mortgage Service Rights [Member]
Estimated future amortization expense
Six months ending December 31, 2013	5,700
Year ending December 31, 2014	9,900
Year ending December 31, 2015	8,100
Year ending December 31, 2016	6,700
Year ending December 31, 2017	5,600
Year ending December 31, 2018	$ 4,700

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 in the remainder of the fiscal year following the latest fiscal year ended 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 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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Amount of amortization expense expected to be recognized during the second 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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