Note 9 - Fair Value Measurements (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Impairment of Collateral Dependent Loans	$ 931,000	$ 0	$ 931,000	$ 0

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