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Organization (Details)	12 Months Ended
Organization (Details)	Dec. 31, 2012 item
Organization
Number of banking locations	21

Represents the number of banking locations through which the bank provides customary retail services to individuals and businesses.

No definition available.

Name:	fncb_NumberOfBankingLocations
Namespace Prefix:	fncb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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