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Note 5 - Loans Receivable - Accretable Yield (Details) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 USD ($)
2018 | $ 419
2019 | 1,309
First Personal Financial Corporation [Member] |
2018 | 114
2019 | 402
2019 | 328
2020 | 1,236
2021 | 1,167
Total | 4,303
2022 | 1,156
2023 | 415
First Personal Financial Corporation [Member] | Financial Asset Acquired with Credit Deterioration [Member] |
2018 | 26
2019 | 118
2019 | (25)
2020 | (100)
2021 | (25)
Total | (150)
First Federal Savings and Loan [Member] |
2018 | 105
2019 | 22
2019 | 112
2020 | 402
2021 | 341
Total | 1,259
2022 | 330
2023 | 74
Liberty Savings Bank [Member] |
2018 | 200
2019 | 42
2019 | 216
2020 | 833
2021 | 826
Total | 3,043
2022 | 826
2023 | 341
AJS Bancorp, Inc [Member] |
2018 |
2019 | $ 843

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
Name: | nwin_FinancingReceivablesAcquiredAccretableYieldCollectedCurrentYear
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
Name: | nwin_FinancingReceivablesAcquiredAccretableYieldToBeCollected
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 the remainder of current fiscal year. + References No definition available. + Details
Name: | nwin_FinancingReceivablesAcquiredAccretableYieldToBeCollectedRemainderOfFiscalYear
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
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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, 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
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X
- Details
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Namespace Prefix: |
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X
- Details
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Data Type: | na
Balance Type: |
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X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=nwin_FirstFederalSavingsAndLoanMember
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_AJSBancorpIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |