XML 78 R62.htm IDEA: XBRL DOCUMENT
v3.26.1

Note 4 - Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Details) - USD ($) | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Investment securities available for sale, amortized cost | $ 491,490,000 | $ 473,433,000
Investment securities available for sale, gross unrealized gains | 4,992,000 | 530,000
Investment securities available for sale, gross unrealized losses | (19,887,000) | (36,228,000)
Investment securities available for sale, Estimated fair value | 476,595,000 | 437,735,000
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member] |  |
Investment securities available for sale, amortized cost | 257,520,000 | 243,709,000
Investment securities available for sale, gross unrealized gains | 2,709,000 | 138,000
Investment securities available for sale, gross unrealized losses | (7,064,000) | (15,456,000)
Investment securities available for sale, Estimated fair value | 253,165,000 | 228,391,000
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] |  |
Investment securities available for sale, amortized cost | 141,861,000 | 133,749,000
Investment securities available for sale, gross unrealized gains | 1,245,000 | 77,000
Investment securities available for sale, gross unrealized losses | (8,342,000) | (11,956,000)
Investment securities available for sale, Estimated fair value | 134,764,000 | 121,870,000
US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 92,109,000 | 95,975,000
Investment securities available for sale, gross unrealized gains | 1,038,000 | 315,000
Investment securities available for sale, gross unrealized losses | (4,481,000) | (8,816,000)
Investment securities available for sale, Estimated fair value | $ 88,666,000 | $ 87,474,000

X
- Definition Amount, before tax, of unrealized gain 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before tax, of unrealized 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=plbc_ResidentialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=plbc_CommercialMortgageBackedSecuritiesIssuedByUSGovernmentAgenciesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |