Share Repurchase Plan (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012
Share Repurchase Plan [Abstract]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	100,000
Stock Repurchased Since Inception, Shares	57,883
Treasury Stock, Average Cost Per Share	16.97
Stock Repurchased Since Inception, Value	$ 982

Number of shares that have been repurchased since inception and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

No definition available.

Name:	qnbc_StockRepurchasedSinceInceptionShares
Namespace Prefix:	qnbc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant