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Condensed Parent Company Financial Statements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
ASSETS      
Other assets $ 2,979us-gaap_OtherAssets $ 2,291us-gaap_OtherAssets  
Total assets 271,020us-gaap_Assets 263,033us-gaap_Assets  
LIABILITIES AND STOCKHOLDERS' EQUITY      
Other liabilities 2,160us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent 1,975us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent  
Stockholders' equity 30,712us-gaap_StockholdersEquity 28,942us-gaap_StockholdersEquity 30,563us-gaap_StockholdersEquity
Total liabilities and stockholders' equity 271,020us-gaap_LiabilitiesAndStockholdersEquity 263,033us-gaap_LiabilitiesAndStockholdersEquity  
Parent      
ASSETS      
Non-interest bearing deposit in the Bank 2,143us-gaap_DueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,716us-gaap_DueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Loan to the Bank ESOP 1,018gtwn_EmployeeStockOwnershipPlanESOPOutstandingLoanAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,086gtwn_EmployeeStockOwnershipPlanESOPOutstandingLoanAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Investment in subsidiary 27,436us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
25,065us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Other assets 169us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
118us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Total assets 30,766us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
28,985us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
LIABILITIES AND STOCKHOLDERS' EQUITY      
Other liabilities 54us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
43us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Stockholders' equity 30,712us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
28,942us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Total liabilities and stockholders' equity $ 30,766us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 28,985us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember