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Note 5 - Loans (Details) - Gross Loans (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Note 5 - Loans (Details) - Gross Loans [Line Items]    
Loans, gross $ 805,059us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 767,513us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Percentage of loans, gross 100.00%plmt_PercentageOfGrossLoans 100.00%plmt_PercentageOfGrossLoans
Commercial Real Estate Loans [Member]    
Note 5 - Loans (Details) - Gross Loans [Line Items]    
Loans, gross 430,025us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_CommercialRealEstateLoansMember		 455,452us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_CommercialRealEstateLoansMember
Percentage of loans, gross 53.40%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_CommercialRealEstateLoansMember		 59.40%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_CommercialRealEstateLoansMember
Single Family Residential [Member]    
Note 5 - Loans (Details) - Gross Loans [Line Items]    
Loans, gross 204,439us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_SingleFamilyResidentialMember		 178,125us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_SingleFamilyResidentialMember
Percentage of loans, gross 25.40%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_SingleFamilyResidentialMember		 23.20%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_SingleFamilyResidentialMember
Commercial and Industrial [Member]    
Note 5 - Loans (Details) - Gross Loans [Line Items]    
Loans, gross 80,927us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_CommercialAndIndustrialMember		 73,078us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_CommercialAndIndustrialMember
Percentage of loans, gross 10.00%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_CommercialAndIndustrialMember		 9.50%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_CommercialAndIndustrialMember
Consumer [Member]    
Note 5 - Loans (Details) - Gross Loans [Line Items]    
Loans, gross 76,984us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_ConsumerMember		 50,099us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_ConsumerMember
Percentage of loans, gross 9.60%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_ConsumerMember		 6.50%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_ConsumerMember
Other Financing Receivable [Member]    
Note 5 - Loans (Details) - Gross Loans [Line Items]    
Loans, gross $ 12,684us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_OtherFinancingReceivableMember		 $ 10,759us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_OtherFinancingReceivableMember
Percentage of loans, gross 1.60%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_OtherFinancingReceivableMember		 1.40%plmt_PercentageOfGrossLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_OtherFinancingReceivableMember