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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Mortgage servicing rights [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | $ 2,689 | $ 2,549 | $ 2,747 | $ 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 50,908 | 66,097 |  |
Other Observable Inputs (Level 2) [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 234,401 | 202,630 |  |
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 824,041 | 837,373 |  |
Recurring [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 234,680 | 202,795 |  |
Recurring [Member] | U.S. Treasury [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 2,023 | 2,030 |  |
Recurring [Member] | Government sponsored enterprises [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 69,576 | 55,180 |  |
Recurring [Member] | Asset-backed securities [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 124,918 | 107,872 |  |
Recurring [Member] | Obligations of states and political subdivisions [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 35,474 | 35,164 |  |
Recurring [Member] | Mortgage servicing rights [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 2,689 | 2,549 |  |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 2,023 | 2,030 |  |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 2,023 | 2,030 |  |
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 | 0 |  |
Recurring [Member] | Other Observable Inputs (Level 2) [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 229,968 | 198,216 |  |
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 | 69,576 | 55,180 |  |
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Asset-backed securities [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 124,918 | 107,872 |  |
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Obligations of states and political subdivisions [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 35,474 | 35,164 |  |
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Mortgage servicing rights [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 0 | 0 |  |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Assets: |  |  |  |
Assets, Total | 2,689 | 2,549 |  |
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 | $ 2,689 | $ 2,549 |  |

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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