Consolidated Balance Sheets (Current Period Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 12,452us-gaap_CashAndDueFromBanks	$ 12,894us-gaap_CashAndDueFromBanks
Interest-bearing deposits	87,676us-gaap_InterestBearingDepositsInBanks	102,548us-gaap_InterestBearingDepositsInBanks
Securities available for sale, at fair value	238,496us-gaap_AvailableForSaleSecurities	222,844us-gaap_AvailableForSaleSecurities
Securities held to maturity (fair value approximates $163,143 at March 31, 2015 and $167,703 at December 31, 2014)	156,135us-gaap_HeldToMaturitySecurities	161,452us-gaap_HeldToMaturitySecurities
Restricted stock, at cost	1,129us-gaap_InvestmentOwnedRestrictedCost	1,089us-gaap_InvestmentOwnedRestrictedCost
Loans held for sale	1,091us-gaap_LoansHeldForSaleMortgages	291us-gaap_LoansHeldForSaleMortgages
Loans, net of unearned income and deferred fees	622,171	605,466
Less allowance for loan losses	(8,257)	(8,263)
Loans, net	613,914	597,203
Premises and equipment, net	8,998us-gaap_PropertyPlantAndEquipmentNet	9,131us-gaap_PropertyPlantAndEquipmentNet
Accrued interest receivable	5,506us-gaap_InterestReceivable	5,748us-gaap_InterestReceivable
Other real estate owned, net	4,573	4,744
Intangible assets and goodwill	6,954	7,223
Bank-owned life insurance	21,946us-gaap_BankOwnedLifeInsurance	21,797us-gaap_BankOwnedLifeInsurance
Other assets	5,975us-gaap_OtherAssets	7,767us-gaap_OtherAssets
Total assets	1,164,845us-gaap_Assets	1,154,731us-gaap_Assets
Liabilities and Stockholders' Equity
Noninterest-bearing demand deposits	160,217	150,744
Interest-bearing demand deposits	526,388	533,641
Savings deposits	85,615nksh_DepositSavingsDeposits	81,297nksh_DepositSavingsDeposits
Time deposits	212,737us-gaap_TimeDeposits	216,746us-gaap_TimeDeposits
Total deposits	984,957us-gaap_Deposits	982,428us-gaap_Deposits
Accrued interest payable	70	68
Other liabilities	7,096us-gaap_OtherLiabilities	5,932us-gaap_OtherLiabilities
Total liabilities	992,123us-gaap_Liabilities	988,428us-gaap_Liabilities
Commitments and contingencies
Stockholders' Equity
Preferred stock, no par value, 5,000,000 shares authorized; none issued and outstanding
Common stock of $1.25 par value. Authorized 10,000,000 shares; issued and outstanding 6,950,474 shares at March 31, 2015 and at December 31, 2014	8,688us-gaap_CommonStockValue	8,688us-gaap_CommonStockValue
Retained earnings	167,253	163,287
Accumulated other comprehensive loss, net	(3,219)	(5,672)
Total stockholders' equity	172,722us-gaap_StockholdersEquity	166,303us-gaap_StockholdersEquity
Total liabilities and stockholders' equity	$ 1,164,845	$ 1,154,731

Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts.

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Amount of domestic noninterest-bearing deposits held by the entity, which may include demand deposits, checking, brokered and retail deposits.

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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

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The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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