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Note 5 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Note 5 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans [Line Items]    
Troubled debt restructurings $ 19,242us-gaap_FinancingReceivableModificationsRecordedInvestment $ 19,871us-gaap_FinancingReceivableModificationsRecordedInvestment
Impaired loans 28,715us-gaap_ImpairedFinancingReceivableRecordedInvestment 31,562us-gaap_ImpairedFinancingReceivableRecordedInvestment
Accrual Status [Member]    
Note 5 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans [Line Items]    
Troubled debt restructurings 14,255us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_AccrualStatusMember		 15,585us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_AccrualStatusMember
Impaired loans 14,255us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_AccrualStatusMember		 15,585us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_AccrualStatusMember
Nonaccrual Status [Member]    
Note 5 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans [Line Items]    
Troubled debt restructurings 4,987us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_NonaccrualStatusMember		 4,286us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_NonaccrualStatusMember
Impaired loans 4,987us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_NonaccrualStatusMember		 4,286us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_NonaccrualStatusMember
Accrual Other Loans [Member]    
Note 5 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans [Line Items]    
Impaired loans 7,794us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_AccrualOtherLoansMember		 7,955us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_AccrualOtherLoansMember
Nonaccrual Other Loans [Member]    
Note 5 - Loans (Details) - Composition of Troubled Debt Restructurings Impaired Loans [Line Items]    
Impaired loans $ 1,679us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_NonaccrualOtherLoansMember		 $ 3,736us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= plmt_NonaccrualOtherLoansMember