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Minimum Regulatory Requirements (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Apr. 08, 2014
Dec. 31, 2013
Other capital restrictions      
Number of previous years retained net income considered for dividend payment 2 years    
The bank      
Total Capital to Risk Weighted Assets, Amount      
Actual 29,522us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  $ 27,850us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Minimum Capital Requirement 16,530us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  15,582us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions 20,663us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  19,477us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Total Capital to Risk Weighted Assets, Ratio      
Actual (as a percent) 14.30%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  14.30%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Minimum Capital Requirement (as a percent) 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions (as a percent) 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Tier 1 Capital to Risk Weighted Assets, Amount      
Actual 27,293us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  25,454us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Minimum Capital Requirement 8,265us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  7,791us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions 12,398us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  11,686us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Tier 1 Capital to Risk Weighted Assets, Ratio      
Actual (as a percent) 13.20%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  13.10%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Minimum Capital Requirement (as a percent) 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions (as a percent) 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Tier 1 Capital to Total Assets, Amount      
Actual 27,293gtwn_TierOneLeverageCapitalToTotalAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  25,454gtwn_TierOneLeverageCapitalToTotalAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Minimum Capital Requirement 10,835gtwn_TierOneLeverageCapitalToTotalAssetsRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  10,540gtwn_TierOneLeverageCapitalToTotalAssetsRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions 13,544gtwn_TierOneLeverageCapitalToTotalAssetsRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  $ 13,174gtwn_TierOneLeverageCapitalToTotalAssetsRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Tier 1 Capital to Total Assets, Ratio      
Actual (as a percent) 10.10%gtwn_TierOneLeverageCapitalToTotalAssetsRatio
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  9.70%gtwn_TierOneLeverageCapitalToTotalAssetsRatio
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Minimum Capital Requirement (as a percent) 4.00%gtwn_TierOneLeverageCapitalRequiredForCapitalAdequacyToTotalAssetsRatio
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  4.00%gtwn_TierOneLeverageCapitalRequiredForCapitalAdequacyToTotalAssetsRatio
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions (as a percent) 5.00%gtwn_TierOneLeverageCapitalRequiredToBeWellCapitalizedToTotalAssetsRatio
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  5.00%gtwn_TierOneLeverageCapitalRequiredToBeWellCapitalizedToTotalAssetsRatio
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Other capital restrictions      
Tier 1 capital risk-weighted assets minimum ratio   4.50%gtwn_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Tier 1 capital risk-weighted assets buffer beginning rate   0.625%gtwn_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssetsCapitalConversionBufferBeginningRate
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Increase in risk-weighted assets ratio   0.625%gtwn_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssetsCapitalConversionBufferAnnualIncreaseRate
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Tier 1 capital risk-weighted assets buffer final   2.50%gtwn_CommonEquityTieroneRiskBasedCapitalToRiskWeightedAssetsCapitalConversionBufferFinalLevel
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember