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Note 3 - Fair Value Measurements (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Impairment of Collateral Dependent Loans | $ 1,487,000 | $ 1,000

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