XML 67 R38.htm IDEA: XBRL DOCUMENT v3.2.0.727

Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Loans by Credit Quality Indicator - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	$ 613,100	$ 591,198
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	592,881	575,613
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	11,621	5,300
Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	8,598	10,285
Real Estate Construction Portfolio Segment[Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	42,246	45,562
Real Estate Construction Portfolio Segment[Member] | Construction, 1-4 Family Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	11,564	14,222
Real Estate Construction Portfolio Segment[Member] | Construction, 1-4 Family Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	3,860
Real Estate Construction Portfolio Segment[Member] | Construction, 1-4 Family Residential [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	1,196	2,265
Real Estate Construction Portfolio Segment[Member] | Construction Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	25,626	29,047
Real Estate Construction Portfolio Segment[Member] | Construction Other [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans		28
Consumer Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	145,412	146,220
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	16,287	15,861
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans		59
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	116	60
Consumer Real Estate Portfolio Segment [Member] | Closed-end First Liens [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	78,556	78,806
Consumer Real Estate Portfolio Segment [Member] | Closed-end First Liens [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	1,173	1,566
Consumer Real Estate Portfolio Segment [Member] | Closed-end First Liens [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	970	1,412
Consumer Real Estate Portfolio Segment [Member] | Closed-end Junior Liens [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	4,431	4,258
Consumer Real Estate Portfolio Segment [Member] | Closed-end Junior Liens [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	55	21
Consumer Real Estate Portfolio Segment [Member] | Closed-end Junior Liens [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	66	95
Consumer Real Estate Portfolio Segment [Member] | Investor-owned Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	41,986	42,781
Consumer Real Estate Portfolio Segment [Member] | Investor-owned Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	887	688
Consumer Real Estate Portfolio Segment [Member] | Investor-owned Residential Real Estate [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	885	614
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	309,959	297,138
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	77,752	73,611
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	1,363	1,397
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	1,830	850
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	127,913	125,643
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	1,707	202
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	1,894	2,855
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	95,540	90,821
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	1,960	1,177
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Other [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans		582
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	32,461	32,735
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	30,393	31,247
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	479	97
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	1,589	1,390
Public Sector and IDA Portfolio Segment[Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	53,383	41,361
Public Sector and IDA Portfolio Segment[Member] | States & Political Subdivisions [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	53,383	41,361
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	29,639	28,182
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	5,675	5,705
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	11,666	11,505
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	114	93
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	48	128
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	12,109	10,745
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	23
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Classified Excluding Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-impaired gross loans	$ 4	$ 6

X

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 11B



-Subparagraph (h)



-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=nksh_ClassifiedExcludingImpairedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=nksh_RealEstateConstructionPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nksh_Construction14FamilyResidentialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nksh_ConstructionOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=nksh_ConsumerRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nksh_EquityLinesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nksh_ClosedEndFirstLiensMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nksh_ClosedEndJuniorLiensMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nksh_InvestorOwnedResidentialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nksh_MultifamilyRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nksh_CommercialRealEstateOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nksh_CommercialRealEstateOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nksh_CommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=nksh_PublicSectorAndIDAPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nksh_StatesPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CreditCardReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_AutomobileLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nksh_OtherConsumerLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: