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Note 5 - Loans (Details) - Loans Secured by Commercial Real Estate (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Secured by commercial real estate    
Percentage of loans, gross 100.00%plmt_PercentageOfGrossLoans 100.00%plmt_PercentageOfGrossLoans
Construction, Land Development and Other Land Loan [Member]    
Secured by commercial real estate    
Loans, gross (in Dollars) 48,002us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_ConstructionLandDevelopmentAndOtherLandLoanMember		  
Percentage of loans, gross 5.80%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_ConstructionLandDevelopmentAndOtherLandLoanMember		  
Percentage of Bank's total regulatory capital 32.90%plmt_PercentageOfRegulatoryCapital
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_ConstructionLandDevelopmentAndOtherLandLoanMember		  
Multi Family Residential [Member]    
Secured by commercial real estate    
Loans, gross (in Dollars) 8,868us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_MultiFamilyResidentialMember		  
Percentage of loans, gross 1.10%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_MultiFamilyResidentialMember		  
Percentage of Bank's total regulatory capital 6.10%plmt_PercentageOfRegulatoryCapital
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_MultiFamilyResidentialMember		  
Non Farm Nonresidential [Member]    
Secured by commercial real estate    
Loans, gross (in Dollars) 373,228us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_NonFarmNonresidentialMember		  
Percentage of loans, gross 44.80%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_NonFarmNonresidentialMember		  
Percentage of Bank's total regulatory capital 256.00%plmt_PercentageOfRegulatoryCapital
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_NonFarmNonresidentialMember		  
Commercial Real Estate Loans [Member]    
Secured by commercial real estate    
Loans, gross (in Dollars) 430,098us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_CommercialRealEstateLoansMember		  
Percentage of loans, gross 51.70%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_CommercialRealEstateLoansMember		 53.40%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_CommercialRealEstateLoansMember
Percentage of Bank's total regulatory capital 295.00%plmt_PercentageOfRegulatoryCapital
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_CommercialRealEstateLoansMember