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Summary of Significant Accounting Policies (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
item
Dec. 31, 2013
Federal Home Loan Bank stock                    
Federal Home Loan Bank stock, at cost $ 2,907,000us-gaap_FederalHomeLoanBankStock               $ 2,907,000us-gaap_FederalHomeLoanBankStock $ 2,907,000us-gaap_FederalHomeLoanBankStock
Number of operating segments                 0us-gaap_NumberOfOperatingSegments  
Loans                    
Period of past due loans for discontinuance of accrual of interest on loans                 90 days  
Earnings Per Common Share                    
Net income available to common stockholders 440,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 390,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 374,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 275,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 168,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 150,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 209,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 208,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 1,479,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 735,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic common shares:                    
Weighted average shares outstanding                 1,789,702us-gaap_WeightedAverageNumberOfSharesIssuedBasic 1,865,874us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Less: Weighted average unallocated ESOP shares                 (90,775)us-gaap_WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased (98,016)us-gaap_WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased
Add: Weighted average unvested restricted stock shares with non-forfeitable dividend rights                 40,166us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights 35,923us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights
Basic weighted average common shares outstanding                 1,739,093us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 1,803,781us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive potential common shares                 5,428us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 4,903us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted average common shares outstanding                 1,744,521us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 1,808,684us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share (in dollars per share) $ 0.25us-gaap_EarningsPerShareBasic $ 0.22us-gaap_EarningsPerShareBasic $ 0.21us-gaap_EarningsPerShareBasic $ 0.16us-gaap_EarningsPerShareBasic $ 0.09us-gaap_EarningsPerShareBasic $ 0.08us-gaap_EarningsPerShareBasic $ 0.11us-gaap_EarningsPerShareBasic $ 0.12us-gaap_EarningsPerShareBasic $ 0.85us-gaap_EarningsPerShareBasic $ 0.41us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share) $ 0.25us-gaap_EarningsPerShareDiluted $ 0.22us-gaap_EarningsPerShareDiluted $ 0.21us-gaap_EarningsPerShareDiluted $ 0.16us-gaap_EarningsPerShareDiluted $ 0.09us-gaap_EarningsPerShareDiluted $ 0.08us-gaap_EarningsPerShareDiluted $ 0.11us-gaap_EarningsPerShareDiluted $ 0.12us-gaap_EarningsPerShareDiluted $ 0.85us-gaap_EarningsPerShareDiluted $ 0.41us-gaap_EarningsPerShareDiluted
Minimum                    
Premises and equipment                    
Estimated Useful Lives                 3 years  
Maximum                    
Premises and equipment                    
Estimated Useful Lives                 40 years  
FHLB                    
Federal Home Loan Bank stock                    
FHLB par value stock (in dollars per share)                   $ 100gtwn_FederalHomeLoanBankStockParOrStatedValuePerShare
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfBostonMember
Membership stock investment requirement (as a percent)                   0.35%gtwn_FederalHomeLoanBankMembershipStockInvestmentRequirementPercentage
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfBostonMember
FHLB | Overnight advances                    
Federal Home Loan Bank stock                    
Activity-Based stock investment requirement (as a percent)                   3.00%gtwn_FederalHomeLoanBankActivityBasedStockInvestmentRequirementPercentage
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfBostonMember
/ gtwn_FederalHomeLoanBankAdvancesTypeAxis
= gtwn_FederalHomeLoanBankOvernightAdvancesMember
FHLB | FHLB advances                    
Federal Home Loan Bank stock                    
Activity-Based stock investment requirement (as a percent)                   4.00%gtwn_FederalHomeLoanBankActivityBasedStockInvestmentRequirementPercentage
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfBostonMember
/ gtwn_FederalHomeLoanBankAdvancesTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
FHLB | Other advances                    
Federal Home Loan Bank stock                    
Activity-Based stock investment requirement (as a percent)                   4.50%gtwn_FederalHomeLoanBankActivityBasedStockInvestmentRequirementPercentage
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfBostonMember
/ gtwn_FederalHomeLoanBankAdvancesTypeAxis
= gtwn_FederalHomeLoanBankOtherAdvancesMember
FHLB | Standby letters of credit                    
Federal Home Loan Bank stock                    
Activity-Based stock investment requirement (as a percent)                   0.50%gtwn_FederalHomeLoanBankActivityBasedStockInvestmentRequirementPercentage
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfBostonMember
/ gtwn_FederalHomeLoanBankAdvancesTypeAxis
= gtwn_FederalHomeLoanBankStandbyLettersOfCreditMember
FHLB | Intermediated derivative contracts                    
Federal Home Loan Bank stock                    
Activity-Based stock investment requirement (as a percent)                   4.50%gtwn_FederalHomeLoanBankActivityBasedStockInvestmentRequirementPercentage
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfBostonMember
/ gtwn_FederalHomeLoanBankAdvancesTypeAxis
= gtwn_FederalHomeLoanBankDerivativeContractsMember
FHLB | Minimum                    
Federal Home Loan Bank stock                    
Federal Home Loan Bank stock, at cost                   10,000us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfBostonMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maturity period of FHLB advances                 2 days  
FHLB | Maximum                    
Federal Home Loan Bank stock                    
Federal Home Loan Bank stock, at cost                   $ 25,000,000us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfBostonMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maturity period of FHLB advances                 3 months