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Note 8 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreements to Repurchase (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Average daily balance during the year | $ 52,923,000 | $ 19,001,000
Average interest rate during the year | 1.47% | 0.19%
Maximum month-end balance during the year | $ 103,187,000 | $ 22,073,000
Weighted average interest rate at year-end | 1.65% | 0.19%

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- Definition The weighted average interest rate at period end for assets sold under agreements to repurchase. + References No definition available. + Details
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Data Type: | dtr-types:percentItemType
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Period Type: | instant

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- Definition Average daily balance during the period for securities sold under agreements to repurchase. + References No definition available. + Details
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Namespace Prefix: | plbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Maximum month end balance during period for securities sold under agreements to repurchase. + References No definition available. + Details
Name: | plbc_SecuritiesSoldUnderAgreementsToRepurchaseMaximumMonthEndBalanceDuringPeriod
Namespace Prefix: | plbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(ii)(A)(ii)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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Period Type: | instant