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Fair Value (Details 4) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Financial assets: |  |
Impaired loans | $ 17,165 | $ 20,064
Foreclosed real estate | 768 | 2,217
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Financial assets: |  |
Impaired loans | 0 | 0
Foreclosed real estate | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial assets: |  |
Impaired loans | 0 | 0
Foreclosed real estate | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Financial assets: |  |
Impaired loans | 17,165 | 20,064
Foreclosed real estate | $ 768 | $ 2,217

X
- Definition This element represents the portion of the balance sheet assertion valued at fair value of foreclosed real estate. + References No definition available. + Details
Name: | nwin_ForeclosedRealEstateFairValueDisclosure
Namespace Prefix: | nwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the portion of the balance sheet assertion valued at fair value of impaired loans receivables. + References No definition available. + Details
Name: | nwin_ImpairedLoansReceivableFairValueDisclosure
Namespace Prefix: | nwin_
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