XML 66 R41.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Troubled Debt Restructurings by Class (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Commercial Real Estate |  |  |  |
Number of contracts | 1 | 2 | 2 | 4
Pre-modification outstanding principal balance | $ 2,484 | $ 474 | $ 2,668 | $ 4,128
Post-modification outstanding principal balance | 2,484 | 483 | 2,693 | 4,222
Multifamily Real Estate [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Commercial Real Estate |  |  |  |
Number of contracts | 1 |  | 1 |
Pre-modification outstanding principal balance | 2,484 |  | 2,484 |
Post-modification outstanding principal balance | 2,484 |  | 2,484 |
Commercial Real Estate, Owner Occupied [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Commercial Real Estate |  |  |  |
Number of contracts |  |  | 1 | 1
Pre-modification outstanding principal balance |  |  | 184 | 154
Post-modification outstanding principal balance |  |  | 209 | 239
Residential Closed End First Liens [Member] | Consumer Real Estate Loans [Member] |  |  |  |
Commercial Real Estate |  |  |  |
Number of contracts |  | 1 |  | 1
Pre-modification outstanding principal balance |  | 212 |  | 212
Post-modification outstanding principal balance |  | 216 |  | 216
Residential Closed End Junior Liens [Member] | Consumer Real Estate Loans [Member] |  |  |  |
Commercial Real Estate |  |  |  |
Number of contracts |  | 1 |  | 1
Pre-modification outstanding principal balance |  | 262 |  | 262
Post-modification outstanding principal balance |  | 267 |  | 267
Commercial Real Estate, Other [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Commercial Real Estate |  |  |  |
Number of contracts |  |  |  | 1
Pre-modification outstanding principal balance |  |  |  | 3,500
Post-modification outstanding principal balance |  |  |  | $ 3,500

X
- Details
Name: | nksh_CommercialRealEstateAbstract00
Namespace Prefix: | nksh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration