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Fair Value (Details 4) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Asset Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans | $ 0 | $ 0
Foreclosed real estate | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Asset Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans | 0 | 0
Foreclosed real estate | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Asset Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans | 7,820 | 8,164
Foreclosed real estate | 1,119 | 1,084
Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value Asset Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans | 7,820 | 8,164
Foreclosed real estate | $ 1,119 | $ 1,084

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- Details
Name: | nwin_FairValueAssetMeasuredOnNonrecurringBasisLineItems
Namespace Prefix: | nwin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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