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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