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Note 20 - Fair Value Measurements (Details) - Significant Unobservable Inputs Used in Fair Value Measurements for Level 3 Assets Measured at Fair Value on a Nonrecurring Basis (Fair Value, Measurements, Nonrecurring [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Assets    
Foreclosed real estate $ 4,799plmt_ForeclosedAndRepossessedAssetsFairValue $ 6,660plmt_ForeclosedAndRepossessedAssetsFairValue
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate and Repossessed Personal Property [Member]    
Assets    
Foreclosed real estate 4,717plmt_ForeclosedAndRepossessedAssetsFairValue
/ us-gaap_FairValueByAssetClassAxis
= plmt_ForeclosedRealEstateAndRepossessedPersonalPropertyMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		  
Foreclosed real estate Appraisals of collateral value  
Foreclosed real estate Adjustments to appraisal for age of comparable sales  
Fair Value, Inputs, Level 3 [Member]    
Assets    
Foreclosed real estate $ 4,717plmt_ForeclosedAndRepossessedAssetsFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 $ 6,595plmt_ForeclosedAndRepossessedAssetsFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember