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Loans and Servicing (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loans      
Total loans $ 233,143us-gaap_NotesReceivableGross $ 225,868us-gaap_NotesReceivableGross  
Other items:      
Net deferred loan costs 379us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums 440us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums  
Allowance for loan losses (2,229)us-gaap_LoansAndLeasesReceivableAllowance (2,396)us-gaap_LoansAndLeasesReceivableAllowance (1,780)us-gaap_LoansAndLeasesReceivableAllowance
Total loans, net 231,293us-gaap_LoansAndLeasesReceivableNetReportedAmount 223,912us-gaap_LoansAndLeasesReceivableNetReportedAmount  
Residential loans:      
Loans      
Total loans 100,698us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
107,849us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
One- to four- family, residential loans      
Loans      
Total loans 84,199us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyResidentialMortgageLoanMember
92,450us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyResidentialMortgageLoanMember
 
Other items:      
Allowance for loan losses (273)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyResidentialMortgageLoanMember
(284)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyResidentialMortgageLoanMember
(378)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyResidentialMortgageLoanMember
Home equity loans and lines of credit      
Loans      
Total loans 16,499us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
15,399us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
 
Other items:      
Allowance for loan losses (249)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
(274)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
(254)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
Commercial loans:      
Loans      
Total loans 103,430us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
96,504us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
 
One-to-four family investment property      
Loans      
Total loans 8,345us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyInvestmentPropertyCommercialLoanMember
11,089us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyInvestmentPropertyCommercialLoanMember
 
Other items:      
Allowance for loan losses (46)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyInvestmentPropertyCommercialLoanMember
(61)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyInvestmentPropertyCommercialLoanMember
(62)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyInvestmentPropertyCommercialLoanMember
Multi-family real estate      
Loans      
Total loans 15,020us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_MultiFamilyRealEstateCommercialLoanMember
14,462us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_MultiFamilyRealEstateCommercialLoanMember
 
Other items:      
Allowance for loan losses (113)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_MultiFamilyRealEstateCommercialLoanMember
(108)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_MultiFamilyRealEstateCommercialLoanMember
(40)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_MultiFamilyRealEstateCommercialLoanMember
Commercial real estate      
Loans      
Total loans 62,227us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
54,272us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Other items:      
Allowance for loan losses (943)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
(1,056)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
(668)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
Commercial business      
Loans      
Total loans 17,838us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_CommercialBusinessMember
16,681us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_CommercialBusinessMember
 
Other items:      
Allowance for loan losses (311)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_CommercialBusinessMember
(291)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_CommercialBusinessMember
(159)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_CommercialBusinessMember
Construction loans:      
Loans      
Total loans 28,726us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConstructionLoansMember
21,107us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConstructionLoansMember
 
One-to-four family, construction loans      
Loans      
Total loans 13,056us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyConstructionLoansMember
9,848us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyConstructionLoansMember
 
Other items:      
Allowance for loan losses (117)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyConstructionLoansMember
(133)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyConstructionLoansMember
(149)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_OneToFourFamilyConstructionLoansMember
Multi-family      
Loans      
Total loans 10,842us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_MultiFamilyConstructionLoansMember
7,304us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_MultiFamilyConstructionLoansMember
 
Other items:      
Allowance for loan losses (97)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_MultiFamilyConstructionLoansMember
(66)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_MultiFamilyConstructionLoansMember
(34)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_MultiFamilyConstructionLoansMember
Non-residential      
Loans      
Total loans 4,828us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_NonResidentialConstructionLoansMember
3,955us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_NonResidentialConstructionLoansMember
 
Other items:      
Allowance for loan losses (77)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_NonResidentialConstructionLoansMember
(63)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_NonResidentialConstructionLoansMember
(25)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= gtwn_NonResidentialConstructionLoansMember
Consumer      
Loans      
Total loans 289us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember
408us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember
 
Other items:      
Allowance for loan losses $ (3)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember
$ (15)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember
$ (11)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember