Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$ 12,894us-gaap_CashAndDueFromBanks	$ 13,283us-gaap_CashAndDueFromBanks
Interest-bearing deposits	102,548us-gaap_InterestBearingDepositsInBanks	98,066us-gaap_InterestBearingDepositsInBanks
Securities available for sale, at fair value	222,844us-gaap_AvailableForSaleSecurities	181,712us-gaap_AvailableForSaleSecurities
Securities held to maturity (fair value approximates $167,703 at December 31, 2014 and $159,337 at December 31, 2013)	161,452us-gaap_HeldToMaturitySecurities	163,983us-gaap_HeldToMaturitySecurities
Restricted stock	1,089us-gaap_InvestmentOwnedRestrictedCost	1,414us-gaap_InvestmentOwnedRestrictedCost
Mortgage loans held for sale	291us-gaap_LoansHeldForSaleMortgages	1,276us-gaap_LoansHeldForSaleMortgages
Real estate construction loans	45,562	45,925
Consumer real estate loans	147,039nksh_LoansReceivableConsumerRealEstate	145,499nksh_LoansReceivableConsumerRealEstate
Commercial real estate loans	310,762	311,266
Commercial non real estate loans	33,413	31,262
Public sector and IDA loans	41,361	34,220
Consumer non real estate loans	28,182	28,423
Total loans	606,319	596,595
Less unearned income and deferred fees	(853)	(905)
Loans, net of unearned income and deferred fees	605,466	595,690
Less allowance for loan losses	(8,263)	(8,227)
Loans, net	597,203	587,463
Premises and equipment, net	9,131us-gaap_PropertyPlantAndEquipmentNet	9,951us-gaap_PropertyPlantAndEquipmentNet
Accrued interest receivable	5,748us-gaap_InterestReceivable	5,949us-gaap_InterestReceivable
Other real estate owned, net	4,744	4,712
Intangible assets and goodwill	7,223	8,299
Bank-owned life insurance (BOLI)	21,797us-gaap_BankOwnedLifeInsurance	21,181us-gaap_BankOwnedLifeInsurance
Other assets	7,767us-gaap_OtherAssets	13,341us-gaap_OtherAssets
Total assets	1,154,731us-gaap_Assets	1,110,630us-gaap_Assets
Liabilities and Stockholders’ Equity
Noninterest-bearing demand deposits	150,744	142,645
Interest-bearing demand deposits	533,641	501,541
Savings deposits	81,297nksh_DepositSavingsDeposits	74,141nksh_DepositSavingsDeposits
Time deposits	216,746us-gaap_TimeDeposits	241,709us-gaap_TimeDeposits
Total deposits	982,428us-gaap_Deposits	960,036us-gaap_Deposits
Accrued interest payable	68	92
Other liabilities	5,932us-gaap_OtherLiabilities	4,610us-gaap_OtherLiabilities
Total liabilities	988,428us-gaap_Liabilities	964,738us-gaap_Liabilities
Commitments and contingencies
Preferred stock, no par value, 5,000,000 shares authorized; none issued and outstanding	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common stock of $1.25 par value. Authorized 10,000,000 shares; issued and outstanding, 6,950,474 shares in 2014 and 6,947,974 in 2013	8,688us-gaap_CommonStockValue	8,685us-gaap_CommonStockValue
Retained earnings	163,287	154,171
Accumulated other comprehensive loss, net	(5,672)	(16,964)
Total stockholders’ equity	166,303us-gaap_StockholdersEquity	145,892us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity	$ 1,154,731	$ 1,110,630

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

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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

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