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Note 21 - Regulatory Capital Requirements (Details) - The Company’s and the Bank’s Actual and Required Capital Ratios (USD $)
Mar. 31, 2015
Dec. 31, 2014
Parent Company [Member]    
Common equity Tier 1 capital    
Common equity Tier 1 capital, ratio 14.37%plmt_CommonEquityTier1CapitalRatio
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   
Common equity Tier 1 capital, amount (in Dollars) $ 134,204plmt_CommonEquityTier1CapitalAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   
Common equity Tier 1 capital, adequately-capitalized minimum 4.50%plmt_CommonEquityTier1CapitalAdequatelyCapitalizedMinimum
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   
Common equity Tier 1 capital, well-capitalized minimum 6.50%plmt_CommonEquityTier1CapitalWellCapitalizedMinimum
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   
Tier 1 risk-based capital    
Tier 1 capital, ratio 14.37%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 15.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital, amount (in Dollars) 134,204us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 132,455us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital, adequately-capitalized minimum 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital, well-capitalized minimum 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total risk-based capital    
Total capital, ratio 15.63%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 16.26%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total capital, amount (in Dollars) 145,972us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 143,519us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total capital, adequately-capitalized minimum 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total capital, well-capitalized minimum 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 leverage    
Tier 1 leverage, ratio 11.86%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 12.15%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 leverage, amount (in Dollars) 134,204us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 132,455us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 leverage, adequately-capitalized minimum 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 leverage, well-capitalized minimum 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Risk-weighted assets    
Risk-weighted assets, amount (in Dollars) 933,659us-gaap_RiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 882,809us-gaap_RiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Adjusted quarterly average total assets (1)    
Adjusted quarterly average total assets, amount (in Dollars) 1,131,677plmt_AdjustedQuarterlyAverageTotalAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [1] 1,090,314plmt_AdjustedQuarterlyAverageTotalAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [1]
The Palmetto Bank [Member]    
Common equity Tier 1 capital    
Common equity Tier 1 capital, ratio 14.36%plmt_CommonEquityTier1CapitalRatio
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		   
Common equity Tier 1 capital, amount (in Dollars) 134,045plmt_CommonEquityTier1CapitalAmount
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		   
Common equity Tier 1 capital, adequately-capitalized minimum 4.50%plmt_CommonEquityTier1CapitalAdequatelyCapitalizedMinimum
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		   
Common equity Tier 1 capital, well-capitalized minimum 6.50%plmt_CommonEquityTier1CapitalWellCapitalizedMinimum
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		   
Tier 1 risk-based capital    
Tier 1 capital, ratio 14.36%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 14.99%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember
Tier 1 capital, amount (in Dollars) 134,045us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 132,299us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember
Tier 1 capital, adequately-capitalized minimum 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember
Tier 1 capital, well-capitalized minimum 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember
Total risk-based capital    
Total capital, ratio 15.62%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 16.24%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember
Total capital, amount (in Dollars) 145,810us-gaap_Capital
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 143,363us-gaap_Capital
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember
Total capital, adequately-capitalized minimum 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember
Total capital, well-capitalized minimum 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember
Tier 1 leverage    
Tier 1 leverage, ratio 11.84%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 12.13%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember
Tier 1 leverage, amount (in Dollars) 134,045us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 132,299us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember
Tier 1 leverage, adequately-capitalized minimum 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember
Tier 1 leverage, well-capitalized minimum 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember
Risk-weighted assets    
Risk-weighted assets, amount (in Dollars) 933,594us-gaap_RiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 882,781us-gaap_RiskWeightedAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember
Adjusted quarterly average total assets (1)    
Adjusted quarterly average total assets, amount (in Dollars) $ 1,131,723plmt_AdjustedQuarterlyAverageTotalAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 [1] $ 1,090,281plmt_AdjustedQuarterlyAverageTotalAssets
/ dei_LegalEntityAxis
= plmt_ThePalmettoBankMember		 [1]
[1] Reflects adjusted average total assets for the three months ended March 31, 2015 and December 31, 2014.