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Off-Balance Sheet Arrangements, Commitments And Contingencies - Litigation (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Financial instruments with off-balance sheet risk  
1 year of less $ 162,153gnbc_GuarantorObligationsMaximumExposureExpiresInOneYearOrLess
More than 1 year but less than 3 years 179,786gnbc_GuarantorObligationsMaximumExposureExpiresInOneYearThroughThreeYears
3 years or more but less than 5 years 99,475gnbc_GuarantorObligationsMaximumExposureExpiresInThreeYearsThroughFiveYears
5 years or more 75,576gnbc_GuarantorObligationsMaximumExposureExpiresAfterFiveYears
Total 516,990us-gaap_GuaranteeObligationsMaximumExposure
Commitments to Extend Credit [Member]  
Financial instruments with off-balance sheet risk  
1 year of less 158,446gnbc_GuarantorObligationsMaximumExposureExpiresInOneYearOrLess
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CommitmentsToExtendCreditMember
More than 1 year but less than 3 years 179,717gnbc_GuarantorObligationsMaximumExposureExpiresInOneYearThroughThreeYears
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CommitmentsToExtendCreditMember
3 years or more but less than 5 years 99,475gnbc_GuarantorObligationsMaximumExposureExpiresInThreeYearsThroughFiveYears
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CommitmentsToExtendCreditMember
5 years or more 75,576gnbc_GuarantorObligationsMaximumExposureExpiresAfterFiveYears
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CommitmentsToExtendCreditMember
Total 513,214us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CommitmentsToExtendCreditMember
Unused lines of Credit [Member]  
Financial instruments with off-balance sheet risk  
1 year of less 3,707gnbc_GuarantorObligationsMaximumExposureExpiresInOneYearOrLess
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_UnusedLinesOfCreditMember
More than 1 year but less than 3 years 69gnbc_GuarantorObligationsMaximumExposureExpiresInOneYearThroughThreeYears
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_UnusedLinesOfCreditMember
Total $ 3,776us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_UnusedLinesOfCreditMember