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Corporate Structure (Details)
 1 Months Ended 12 Months Ended 1 Months Ended
Jun. 30, 2012
Dec. 31, 2014
Jan. 31, 2005
Georgetown Bancorp, MHC      
Conversion and reorganization to stock holding company      
Percentage of common stock owned 56.70%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityShareholderMember		    
Second Step Exchange Ratio   0.72014gtwn_SecondStepExchangeRatio
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityShareholderMember		  
The bank      
Conversion and reorganization to stock holding company      
Percentage of common stock owned     100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember