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Note 9 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Collateral dependent loans, fair value | $ 2,084 |  |
collateral depended loans, total loss | 931 | $ 0 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Collateral dependent loans, fair value | 0 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Collateral dependent loans, fair value | 0 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Collateral dependent loans, fair value | 2,084 |  |
Commercial Loans [Member] |  |  |
Collateral dependent loans, fair value | 24 |  | $ 24
collateral depended loans, total loss | 0 |  |
Commercial Loans [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Collateral dependent loans, fair value | 0 |  | 0
Commercial Loans [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Collateral dependent loans, fair value | 0 |  | 0
Commercial Loans [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Collateral dependent loans, fair value | 24 |  | 24
Agricultural Loans [Member] |  |  |
Collateral dependent loans, fair value | 2,060 |  |
collateral depended loans, total loss | 931 |  |
Agricultural Loans [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Collateral dependent loans, fair value | 0 |  |
Agricultural Loans [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Collateral dependent loans, fair value | 0 |  |
Agricultural Loans [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Collateral dependent loans, fair value | 2,060 |  |
Real Estate Loan [Member] |  |  |
other real estate owned, total loss | 0 |  |
Real Estate Loan [Member] | Residential Portfolio Segment [Member] |  |  |
RE – Residential | 91 |  | 91
Real Estate Loan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
RE – Residential | 0 |  | 0
Real Estate Loan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
RE – Residential | 0 |  | 0
Real Estate Loan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
RE – Residential | $ 91 |  | $ 91

X
- Definition Amount of fair value loss or gain for collateral dependent loans. + References No definition available. + Details
Name: | plbc_CollateralDependentLoansLossGainFairValue
Namespace Prefix: | plbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents fair value portion of impaired loans. + References No definition available. + Details
Name: | plbc_ImpairedLoansFairValue
Namespace Prefix: | plbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of other real estate. + References No definition available. + Details
Name: | plbc_OtherRealEstateFairValueDisclosure
Namespace Prefix: | plbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of fair value loss or gain for other real estate owned. + References No definition available. + Details
Name: | plbc_OtherRealEstateOwnedLossGainFairValue
Namespace Prefix: | plbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=plbc_CommercialLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=plbc_AgriculturalLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |