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Fair Value (Details 4) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Impaired Loans [Member] |  |
Fair Value Asset Measured On Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 7,404 | $ 8,164
Foreclosed Real Estate [Member] |  |
Fair Value Asset Measured On Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | 1,402 | 1,084
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] |  |
Fair Value Asset Measured On Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Foreclosed Real Estate [Member] |  |
Fair Value Asset Measured On Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] |  |
Fair Value Asset Measured On Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Foreclosed Real Estate [Member] |  |
Fair Value Asset Measured On Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |
Fair Value Asset Measured On Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | 7,404 | 8,164
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] |  |
Fair Value Asset Measured On Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 1,402 | $ 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 aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis 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 No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant