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Note 1 - General (Details Textual)	Sep. 30, 2016
California [Member]
Number of Branches	11

Represents the number of branches operated by a bank.

No definition available.

Name:	plbc_NumberOfBranches
Namespace Prefix:	plbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Name:	us-gaap_StatementGeographicalAxis=plbc_CaliforniaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: