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Note 9 - Fair Value Measurement (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024
Impairment of Collateral Dependent Loans	$ 109,000	$ 1,040,000	$ 0

X

- Definition

Represents the impairment of collateral-dependent loans.

+ References

No definition available.

+ Details

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