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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, 2013 | Dec. 31, 2012
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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 | $ 133,573 | $ 128,162
Standby Letters of Credit [Member] |  |
Financial instruments whose contract amounts represent credit risk: |  |
Financial instruments whose contract amounts represents credit risk | 15,215 | 12,533
Interest Rate Lock Commitments [Member] |  |
Financial instruments whose contract amounts represent credit risk: |  |
Financial instruments whose contract amounts represents credit risk | $ 18,257 | $ 22,574

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- Details
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Namespace Prefix: | nksh_
Data Type: | xbrli:stringItemType
Balance Type: | na
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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=28364263&loc=d3e13433-108611 + Details
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Balance Type: | credit
Period Type: | instant