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Note 4 - Loans Receivable - Accretable Yield (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 USD ($)
2020, accretable yield collected | $ 360
2021, accretable yield collected | 305
2021, to be collected | 614
2022, to be collected | 810
2023, to be collected | 289
Total, to be collected | 1,713
First Personal Financial Corporation [Member] |
2020, accretable yield collected | 115
2021, accretable yield collected | 113
2021, to be collected | 186
2022, to be collected | 239
2023, to be collected | 54
Total, to be collected | 479
AJS Bancorp, Inc [Member] |
2020, accretable yield collected | 245
2021, accretable yield collected | 192
2021, to be collected | 428
2022, to be collected | 571
2023, to be collected | 235
Total, to be collected | 1,234
Financial Asset Acquired with Credit Deterioration [Member] | First Personal Financial Corporation [Member] |
2020, accretable yield collected | 29
2021, accretable yield collected | $ 21

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
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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
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
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Namespace Prefix: | nwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition The amount of accretable yield, or income expected to be collected in next fiscal year one. + 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_
Data Type: | xbrli:monetaryItemType
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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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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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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