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Note 5 - Loans (Details) - Troubled Debt Restructurings Removed from Classification (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Troubled Debt Restructurings Removed from Classification [Abstract]      
Carrying balance $ 8,615plmt_FinancingReceivableReclassifiedFromTroubledDebtRestructuring $ 7,077plmt_FinancingReceivableReclassifiedFromTroubledDebtRestructuring $ 6,018plmt_FinancingReceivableReclassifiedFromTroubledDebtRestructuring
Count 7plmt_FinancingReceivableReclassifiedFromTroubledDebtRestructuringNumberOfContracts 14plmt_FinancingReceivableReclassifiedFromTroubledDebtRestructuringNumberOfContracts 19plmt_FinancingReceivableReclassifiedFromTroubledDebtRestructuringNumberOfContracts