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Fair Value Measurements (Details) (USD $) | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Mortgage Servicing Rights [Member] |  |  |
Assets: |  |  |
Assets, Total | $ 2,666,498 | $ 2,746,606 | $ 2,512,103
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Assets: |  |  |
Assets, Total | 45,684,533 |  |
Other Observable Inputs (Level 2) [Member] |  |  |
Assets: |  |  |
Assets, Total | 233,008,665 |  |
Net Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets: |  |  |
Assets, Total | 828,598,498 |  |
Recurring [Member] |  |  |
Assets: |  |  |
Assets, Total | 230,936,239 |  | 213,806,001
Recurring [Member] | U.S. treasury [Member] |  |  |
Assets: |  |  |
Assets, Total | 2,040,781 |  | 2,054,102
Recurring [Member] | Government sponsored enterprises [Member] |  |  |
Assets: |  |  |
Assets, Total | 71,048,653 |  | 70,313,978
Recurring [Member] | Asset-backed securities [Member] |  |  |
Assets: |  |  |
Assets, Total | 120,889,297 |  | 107,328,618
Recurring [Member] | Obligations of states and political subdivisions [Member] |  |  |
Assets: |  |  |
Assets, Total | 34,291,010 |  | 34,109,303
Recurring [Member] | Mortgage Servicing Rights [Member] |  |  |
Assets: |  |  |
Assets, Total | 2,666,498 |  |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Assets: |  |  |
Assets, Total |  |  |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. treasury [Member] |  |  |
Assets: |  |  |
Assets, Total |  |  |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Government sponsored enterprises [Member] |  |  |
Assets: |  |  |
Assets, Total |  |  |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Asset-backed securities [Member] |  |  |
Assets: |  |  |
Assets, Total |  |  |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Obligations of states and political subdivisions [Member] |  |  |
Assets: |  |  |
Assets, Total |  |  |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage Servicing Rights [Member] |  |  |
Assets: |  |  |
Assets, Total |  |  |
Recurring [Member] | Other Observable Inputs (Level 2) [Member] |  |  |
Assets: |  |  |
Assets, Total | 228,269,741 |  | 213,806,001
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | U.S. treasury [Member] |  |  |
Assets: |  |  |
Assets, Total | 2,040,781 |  | 2,054,102
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Government sponsored enterprises [Member] |  |  |
Assets: |  |  |
Assets, Total | 71,048,653 |  | 70,313,978
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Asset-backed securities [Member] |  |  |
Assets: |  |  |
Assets, Total | 120,889,297 |  | 107,328,618
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Obligations of states and political subdivisions [Member] |  |  |
Assets: |  |  |
Assets, Total | 34,291,010 |  | 34,109,303
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Mortgage Servicing Rights [Member] |  |  |
Assets: |  |  |
Assets, Total |  |  |
Recurring [Member] | Net Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets: |  |  |
Assets, Total | 2,666,498 |  |
Recurring [Member] | Net Significant Unobservable Inputs (Level 3) [Member] | U.S. treasury [Member] |  |  |
Assets: |  |  |
Assets, Total |  |  |
Recurring [Member] | Net Significant Unobservable Inputs (Level 3) [Member] | Government sponsored enterprises [Member] |  |  |
Assets: |  |  |
Assets, Total |  |  |
Recurring [Member] | Net Significant Unobservable Inputs (Level 3) [Member] | Asset-backed securities [Member] |  |  |
Assets: |  |  |
Assets, Total |  |  |
Recurring [Member] | Net Significant Unobservable Inputs (Level 3) [Member] | Obligations of states and political subdivisions [Member] |  |  |
Assets: |  |  |
Assets, Total |  |  |
Recurring [Member] | Net Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] |  |  |
Assets: |  |  |
Assets, Total | $ 2,666,498 |  |

X
- 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

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