XML 28 R38.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Past Due and Nonaccrual Loans (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | $ 3,145 | $ 4,090 |
90 or More Days Past Due | 10,138 | 3,755 |
90 or More Days Past Due and Still Accruing | 125 | 170 | 242
Nonaccruals (Including Impaired Nonaccruals) | 11,950 | 13,021 | 7,390
Real Estate Construction [Member] | Construction residential [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 0 | 0 |
90 or More Days Past Due | 123 | 123 |
90 or More Days Past Due and Still Accruing | 0 | 0 |
Nonaccruals (Including Impaired Nonaccruals) | 123 | 123 |
Real Estate Construction [Member] | Construction other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 0 | 31 |
90 or More Days Past Due | 2,869 | 89 |
90 or More Days Past Due and Still Accruing | 0 | 0 |
Nonaccruals (Including Impaired Nonaccruals) | 2,869 | 3,109 |
Consumer Real Estate [Member] | Equity Lines [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 0 | 22 |
90 or More Days Past Due | 30 | 30 |
90 or More Days Past Due and Still Accruing | 0 | 30 |
Nonaccruals (Including Impaired Nonaccruals) | 30 | 98 |
Consumer Real Estate [Member] | Residential closed end first liens [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 1,128 | 1,507 |
90 or More Days Past Due | 346 | 605 |
90 or More Days Past Due and Still Accruing | 104 | 126 |
Nonaccruals (Including Impaired Nonaccruals) | 503 | 801 |
Consumer Real Estate [Member] | Residential closed end junior liens [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 16 | 121 |
90 or More Days Past Due | 99 | 39 |
90 or More Days Past Due and Still Accruing | 0 | 0 |
Nonaccruals (Including Impaired Nonaccruals) | 99 | 120 |
Consumer Real Estate [Member] | Investor-owned residential real estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 410 |  |
90 or More Days Past Due | 0 |  |
90 or More Days Past Due and Still Accruing | 0 |  |
Nonaccruals (Including Impaired Nonaccruals) | 3 |  |
Commercial Real Estate Loans [Member] | Multifamily real estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 664 | 671 |
90 or More Days Past Due | 3,563 | 261 |
90 or More Days Past Due and Still Accruing | 0 | 0 |
Nonaccruals (Including Impaired Nonaccruals) | 4,261 | 4,624 |
Commercial Real Estate Loans [Member] | Commercial real estate, owner occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 468 | 1,113 |
90 or More Days Past Due | 2,771 | 0 |
90 or More Days Past Due and Still Accruing | 18 | 0 |
Nonaccruals (Including Impaired Nonaccruals) | 3,728 | 3,536 |
Commercial Real Estate Loans [Member] | Commercial real estate, other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 73 | 40 |
90 or More Days Past Due | 0 | 2,089 |
90 or More Days Past Due and Still Accruing | 0 | 0 |
Nonaccruals (Including Impaired Nonaccruals) | 0 | 0 |
Commercial Non Real Estate [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 150 | 291 |
90 or More Days Past Due | 309 | 505 |
90 or More Days Past Due and Still Accruing | 0 | 0 |
Nonaccruals (Including Impaired Nonaccruals) | 309 | 561 |
Public Sector and IDA [Member] | Public Sector and IDA [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 0 | 0 |
90 or More Days Past Due | 0 | 0 |
90 or More Days Past Due and Still Accruing | 0 | 0 |
Nonaccruals (Including Impaired Nonaccruals) | 0 | 0 |
Consumer Non Real Estate [Member] | Credit Card Receivable [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 2 | 20 |
90 or More Days Past Due | 3 | 4 |
90 or More Days Past Due and Still Accruing | 3 | 4 |
Nonaccruals (Including Impaired Nonaccruals) | 0 | 0 |
Consumer Non Real Estate [Member] | Automobile [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 189 | 142 |
90 or More Days Past Due | 25 | 10 |
90 or More Days Past Due and Still Accruing | 0 | 10 |
Nonaccruals (Including Impaired Nonaccruals) | 25 | 49 |
Consumer Non Real Estate [Member] | Other Consumer Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30 – 89 Days Past Due | 45 | 132 |
90 or More Days Past Due | 0 | 0 |
90 or More Days Past Due and Still Accruing | 0 | 0 |
Nonaccruals (Including Impaired Nonaccruals) | $ 0 | $ 0 |

X
- Definition Financing receivables that are less than 90 days past due but more than 29 days past due. + References No definition available. + Details
Name: | nksh_FinancingReceivableRecordedInvestment30To89DaysPastDue
Namespace Prefix: | nksh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration