Name:	plbc_AvailableForSaleDebtSecuritiesPledgedToSecureDepositsAndRepurchaseAgreementsAmortizedCostBasis
Namespace Prefix:	plbc_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

This item represents the tax expense (benefit) occurring during the period which are related to the gross unrealized gain (loss) resulting from changes in the fair [carrying] value during the period of available-for-sale securities. Such tax effects would have been charged or credited directly to accumulated other comprehensive income or to related components of shareholders' equity.

No definition available.

Name:	plbc_AvailableforsaleSecuritiesIncomeTaxExpenseBenefitOnAccumulatedGrossUnrealizedGainsLosses
Namespace Prefix:	plbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This item represents the number of investment securities held by the Company.

No definition available.

Name:	plbc_NumberOfInvestmentSecurities
Namespace Prefix:	plbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

This item represents the number of securities sold during the period.

No definition available.

Name:	plbc_NumberOfSecuritiesSoldDuringPeriod
Namespace Prefix:	plbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of securities sold during the period for a gain.

No definition available.

Name:	plbc_NumberOfSecuritiesSoldForGain
Namespace Prefix:	plbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of securities sold during the period for a loss.

No definition available.

Name:	plbc_NumberOfSecuritiesSoldForLoss
Namespace Prefix:	plbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Amount, before tax, of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (b)(1)(i)
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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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-Name Accounting Standards Codification
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Data Type:	xbrli:monetaryItemType
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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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