Note 9 - Fair Value Measurement (Details Textual) - USD ($)	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Impairment of Collateral Dependent Loans	$ 0	$ 271,000

Represents the impairment of collateral-dependent loans.

No definition available.

Name:	plbc_ImpairmentOfCollateralDependentLoans
Namespace Prefix:	plbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration