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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Mortgage Servicing Rights [Member] |  |  |
Assets: |  |  |
Assets, Total | $ 2,624 | $ 2,666 | $ 2,512
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Assets: |  |  |
Assets, Total | 27,789 |  |
Other Observable Inputs (Level 2) [Member] |  |  |
Assets: |  |  |
Assets, Total | 219,509 |  |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets: |  |  |
Assets, Total | 833,025 |  |
Recurring [Member] |  |  |
Assets: |  |  |
Assets, Total | 219,412 |  | 213,806
Recurring [Member] | U.S. treasury [Member] |  |  |
Assets: |  |  |
Assets, Total | 2,036 |  | 2,054
Recurring [Member] | Government sponsored enterprises [Member] |  |  |
Assets: |  |  |
Assets, Total | 66,327 |  | 70,314
Recurring [Member] | Asset-backed securities [Member] |  |  |
Assets: |  |  |
Assets, Total | 113,206 |  | 107,329
Recurring [Member] | Obligations of states and political subdivisions [Member] |  |  |
Assets: |  |  |
Assets, Total | 35,219 |  | 34,109
Recurring [Member] | Mortgage Servicing Rights [Member] |  |  |
Assets: |  |  |
Assets, Total | 2,624 |  |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Assets: |  |  |
Assets, Total | 2,036 |  | 2,054
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. treasury [Member] |  |  |
Assets: |  |  |
Assets, Total | 2,036 |  | 2,054
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Government sponsored enterprises [Member] |  |  |
Assets: |  |  |
Assets, Total | 0 |  | 0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Asset-backed securities [Member] |  |  |
Assets: |  |  |
Assets, Total | 0 |  | 0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Obligations of states and political subdivisions [Member] |  |  |
Assets: |  |  |
Assets, Total | 0 |  | 0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage Servicing Rights [Member] |  |  |
Assets: |  |  |
Assets, Total | 0 |  |
Recurring [Member] | Other Observable Inputs (Level 2) [Member] |  |  |
Assets: |  |  |
Assets, Total | 214,752 |  | 211,752
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | U.S. treasury [Member] |  |  |
Assets: |  |  |
Assets, Total | 0 |  | 0
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Government sponsored enterprises [Member] |  |  |
Assets: |  |  |
Assets, Total | 66,327 |  | 70,314
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Asset-backed securities [Member] |  |  |
Assets: |  |  |
Assets, Total | 113,206 |  | 107,329
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Obligations of states and political subdivisions [Member] |  |  |
Assets: |  |  |
Assets, Total | 35,219 |  | 34,109
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Mortgage Servicing Rights [Member] |  |  |
Assets: |  |  |
Assets, Total | 0 |  |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets: |  |  |
Assets, Total | 2,624 |  | 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. treasury [Member] |  |  |
Assets: |  |  |
Assets, Total | 0 |  | 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Government sponsored enterprises [Member] |  |  |
Assets: |  |  |
Assets, Total | 0 |  | 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Asset-backed securities [Member] |  |  |
Assets: |  |  |
Assets, Total | 0 |  | 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Obligations of states and political subdivisions [Member] |  |  |
Assets: |  |  |
Assets, Total | 0 |  | 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] |  |  |
Assets: |  |  |
Assets, Total | $ 2,624 |  |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration