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Note 5 - Loans Receivable - Accretable Yield (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Jun. 30, 2020
2018, accretable yield collected | $ 872 |
2019, accretable yield collected | 975 |
First Personal Financial Corporation [Member] |  |
2018, accretable yield collected | 357 |
2019, accretable yield collected | 285 |
2020, to be collected |  | $ 1,005
2021, to be collected |  | 994
Total |  | 2,863
2020, to be collected |  | 509
2023, to be collected |  | 355
First Federal Savings and Loan [Member] |  |
2018, accretable yield collected | 22 |
2019, accretable yield collected | 0 |
2020, to be collected |  | 311
2021, to be collected |  | 300
Total |  | 841
2020, to be collected |  | 162
2023, to be collected |  | 68
Liberty Savings Bank [Member] |  |
2018, accretable yield collected | 42 |
2019, accretable yield collected | 0 |
2020, to be collected |  | 694
2021, to be collected |  | 694
Total |  | 2,022
2020, to be collected |  | 347
2023, to be collected |  | 287
AJS Bancorp, Inc [Member] |  |
2018, accretable yield collected | 451 |
2019, accretable yield collected | $ 691 |
Financial Asset Acquired with Credit Deterioration [Member] | First Personal Financial Corporation [Member] |  |
2018, accretable yield collected |  | 90
2019, accretable yield collected |  | 57
2020, to be collected |  | 43
2021, to be collected |  | 21
Total |  | $ 64

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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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
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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
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Namespace Prefix: | nwin_
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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_
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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_
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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_
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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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- Details
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Namespace Prefix: |
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Period Type: |

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

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

X
- Details
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Namespace Prefix: |
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Period Type: |

X
- Details
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