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Note 4 - Loans Receivable - Accretable Yield (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
2020, to be collected | $ 1,192
2021, to be collected | 1,129
Total | 3,839
2018, accretable yield, amount collected | 828
2019, accretable yield, amount collected | 1,824
2022, to be collected | 1,118
2023, to be collected | 401
First Federal Savings and Loan [Member] |
2018, accretable yield, amount collected | 138
2019, accretable yield, amount collected | 22
Liberty Savings Bank [Member] |
2018, accretable yield, amount collected | 266
2019, accretable yield, amount collected | 42
First Personal Financial Corporation [Member] |
2020, to be collected | 392
2021, to be collected | 336
Total | 1,127
2018, accretable yield, amount collected | 424
2019, accretable yield, amount collected | 586
2022, to be collected | 325
2023, to be collected | 74
AJS Bancorp, Inc [Member] |
2020, to be collected | 800
2021, to be collected | 793
Total | 2,712
2018, accretable yield, amount collected |
2019, accretable yield, amount collected | 1,174
2022, to be collected | 793
2023, to be collected | 327
Financial Asset Acquired with Credit Deterioration [Member] | First Federal Savings and Loan [Member] |
2020, to be collected | (96)
2021, to be collected | (24)
Total | (120)
2018, accretable yield, amount collected | 157
2019, accretable yield, amount collected | $ 147

X
- Definition The amount of accretable yield collected during the period from acquired financing receivables in the current fiscal year. + References No definition available. + Details
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Namespace Prefix: | nwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of accretable yield, or income expected to be collected. + References No definition available. + Details
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Namespace Prefix: | nwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of accretable yield, or income expected to be collected in next fiscal year five. + References No definition available. + Details
Name: | nwin_FinancingReceivablesAcquiredAccretableYieldToBeCollectedYearFive
Namespace Prefix: | nwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of accretable yield, or income expected to be collected in next fiscal year four. + References No definition available. + Details
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Namespace Prefix: | nwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of accretable yield, or income expected to be collected in next fiscal year three. + References No definition available. + Details
Name: | nwin_FinancingReceivablesAcquiredAccretableYieldToBeCollectedYearThree
Namespace Prefix: | nwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of accretable yield, or income expected to be collected in next fiscal year two + References No definition available. + Details
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Namespace Prefix: | nwin_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

X
- Definition The amount of accretable yield collected in the previous year from acquired financing reciveables. + References No definition available. + Details
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Namespace Prefix: | nwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=nwin_LibertySavingsBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=nwin_FirstPersonalFinancialCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=nwin_AJSBancorpIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |