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Note 14 - Financial Instruments with Off-Balance Sheet Risk (Details) - Financial Instruments Outstanding Representing Credit Risk (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Commitments to Extend Credit [Member] |  |
Financial instruments whose contract amounts represent credit risk: |  |
Financial instruments whose contract amounts represents credit risk | $ 144,578 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember | $ 133,573 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember
Standby Letters of Credit [Member] |  |
Financial instruments whose contract amounts represent credit risk: |  |
Financial instruments whose contract amounts represents credit risk | 14,677 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = nksh_StandbyLettersOfCredit1Member | 15,215 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = nksh_StandbyLettersOfCredit1Member
Interest Rate Lock Commitments [Member] |  |
Financial instruments whose contract amounts represent credit risk: |  |
Financial instruments whose contract amounts represents credit risk | $ 10,089 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | $ 18,257 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember

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Namespace Prefix: | nksh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
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Data Type: | na
Balance Type: |
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Name: | us-gaap_FinancialInstrumentAxis=us-gaap_InterestRateLockCommitmentsMember
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Data Type: | na
Balance Type: |
Period Type: |