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Note 11 - Deposits (Details) - Jumbo Time Deposit Accounts by Maturity (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jumbo Time Deposit Accounts by Maturity [Abstract]  
Three months or less $ 19,401us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess
Over three months through six months 12,174us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths
Over six months through twelve months 14,187us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months
Twelve months or less 45,762plmt_ContractualMaturitiesTimeDeposits100000OrMore12MonthsOrLess
Over twelve months 21,657us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreAfter12Months
Total time deposits $100 thousand and greater $ 67,419us-gaap_TimeDeposits100000OrMore