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v3.20.1

Note 1 - General (Details Textual) $ in Thousands | Apr. 30, 2020 USD ($) | Mar. 31, 2020 USD ($)
--- | --- | ---
Financing Receivable, Number of Principal and Interest Payment Deferrals |  | 72
Financing Receivable, Principal and Interest Deferred Payments |  | $ 37,703
Financing Receivable, Number of Other Modifications |  | 1
Subsequent Event [Member] |  |
Financing Receivable, Number of Principal and Interest Payment Deferrals | 221 |
Financing Receivable, Principal and Interest Deferred Payments | $ 85,883 |
Financing Receivable, Number of Other Modifications | 9 |
Financing Receivable, Other Modifications | $ 19,700 |
Financing Receivable, Number of Loans Input to SBA System | 717 |
Financing Receivable, Loans Input to SBA System | $ 56,100 |
Financing Receivable, Number of Loans Input to SBA System, Approval | 575 |
Financing Receivable, Number of Loans Input to SBA System, Funded | 516 |
Financing Receivable, Loans Input to SBA System, Funded | $ 48,200 |

X
- Definition The amount of loans input to SBA system. + References No definition available. + Details
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Namespace Prefix: | nksh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of loans input to SBA system that have been funded. + References No definition available. + Details
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Namespace Prefix: | nksh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of loans input to SBA system. + References No definition available. + Details
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Namespace Prefix: | nksh_
Data Type: | xbrli:integerItemType
Balance Type: | na
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X
- Definition The number of loans in put to SBA system that have completed approval. + References No definition available. + Details
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Namespace Prefix: | nksh_
Data Type: | xbrli:integerItemType
Balance Type: | na
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X
- Definition The number of loans input to SBA system that have been funded. + References No definition available. + Details
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Namespace Prefix: | nksh_
Data Type: | xbrli:integerItemType
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X
- Definition Number of other modifications on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19. + References No definition available. + Details
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Namespace Prefix: | nksh_
Data Type: | xbrli:integerItemType
Balance Type: | na
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X
- Definition Number of principal and interest payment deferrals on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19 + References No definition available. + Details
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Namespace Prefix: | nksh_
Data Type: | xbrli:integerItemType
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X
- Definition Amounts of loans received other modification related to loan modification programs offered to financial institution customers affected by COVID-19. + References No definition available. + Details
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Namespace Prefix: | nksh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Deferred amounts of principal and interest payments on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19. + References No definition available. + Details
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Namespace Prefix: | nksh_
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Period Type: | instant

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