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Regulatory Matters (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Total capital (to risk weighted assets)    
Actual - Amount $ 268,770us-gaap_Capital $ 190,229us-gaap_Capital
Actual - Ratio 14.00%us-gaap_CapitalToRiskWeightedAssets 12.50%us-gaap_CapitalToRiskWeightedAssets
For Capital Adequacy Purposes - Amount 154,052us-gaap_CapitalRequiredForCapitalAdequacy 121,719us-gaap_CapitalRequiredForCapitalAdequacy
For Capital Adequacy Purposes - Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Tier 1 capital (to risk weighted assets)    
Actual - Amount 252,963us-gaap_TierOneRiskBasedCapital 173,680us-gaap_TierOneRiskBasedCapital
Actual - Ratio 13.10%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 11.40%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
For Capital Adequacy Purposes - Amount 77,026us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy 60,859us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
For Capital Adequacy Purposes - Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Tier 1 capital (to average assets)    
Actual - Amount 252,963us-gaap_TierOneLeverageCapital 173,680us-gaap_TierOneLeverageCapital
Actual - Ratio 12.10%us-gaap_TierOneLeverageCapitalToAverageAssets 10.30%us-gaap_TierOneLeverageCapitalToAverageAssets
For Capital Adequacy Purposes - Amount 84,003us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy 67,196us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
For Capital Adequacy Purposes - Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
The Bank [Member]    
Total capital (to risk weighted assets)    
Actual - Amount 259,313us-gaap_Capital
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 184,908us-gaap_Capital
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
Actual - Ratio 13.50%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 12.20%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
For Capital Adequacy Purposes - Amount 153,867us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 121,619us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
For Capital Adequacy Purposes - Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
To be Categorized as Well Capitalized under Prompt Corrective Action Provisions - Amount 192,334us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 152,023us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
To be Categorized as Well Capitalized under Prompt Corrective Action Provisions - Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
Tier 1 capital (to risk weighted assets)    
Actual - Amount 243,506us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 168,359us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
Actual - Ratio 12.70%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 11.10%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
For Capital Adequacy Purposes - Amount 76,934us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 60,809us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
For Capital Adequacy Purposes - Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
To be Categorized as Well Capitalized under Prompt Corrective Action Provisions - Amount 115,400us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 91,214us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
To be Categorized as Well Capitalized under Prompt Corrective Action Provisions - Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
Tier 1 capital (to average assets)    
Actual - Amount 243,506us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 168,359us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
Actual - Ratio 11.60%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 10.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
For Capital Adequacy Purposes - Amount 83,738us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 67,021us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
For Capital Adequacy Purposes - Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
To be Categorized as Well Capitalized under Prompt Corrective Action Provisions - Amount $ 104,673us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 $ 83,776us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember
To be Categorized as Well Capitalized under Prompt Corrective Action Provisions - Ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember		 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= gnbc_GreenBankNaMember