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Note 23 - Related Party Transactions (Details) - Related Party Loans (Directors, Executive Officers, and Their Related Interests [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Directors, Executive Officers, and Their Related Interests [Member]
    
Note 23 - Related Party Transactions (Details) - Related Party Loans [Line Items]    
Related party loans, beginning of period $ 1,758us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= plmt_DirectorsExecutiveOfficersAndTheirRelatedInterestsMember		 $ 1,772us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= plmt_DirectorsExecutiveOfficersAndTheirRelatedInterestsMember
Additions:    
Loan originations 30us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= plmt_DirectorsExecutiveOfficersAndTheirRelatedInterestsMember		  
Reductions:    
Paydowns and payoffs 66us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= plmt_DirectorsExecutiveOfficersAndTheirRelatedInterestsMember		 14us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= plmt_DirectorsExecutiveOfficersAndTheirRelatedInterestsMember
Related party loans, end of period $ 1,722us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= plmt_DirectorsExecutiveOfficersAndTheirRelatedInterestsMember		 $ 1,758us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= plmt_DirectorsExecutiveOfficersAndTheirRelatedInterestsMember