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Fair Value (Details 4) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Impaired loans | $ 8,607 | $ 17,879
Foreclosed real estate | 1,657 | 425
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Impaired loans | 0 | 0
Foreclosed real estate | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Impaired loans | 0 | 0
Foreclosed real estate | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans | 8,607 | 17,879
Foreclosed real estate | $ 1,657 | $ 425

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