Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
INTEREST INCOME:
Loans, including fees	$ 75,121	$ 64,404	$ 58,037
Securities	3,993	3,371	2,977
Other investments	352	313	285
Federal funds sold		1us-gaap_InterestIncomeFederalFundsSold	2us-gaap_InterestIncomeFederalFundsSold
Deposits in financial institutions	139	370	280
Total interest income	79,605	68,459	61,581
INTEREST EXPENSE:
Demand and savings deposits	2,539	3,210	2,973
Certificates and other time deposits	6,747us-gaap_InterestExpenseTimeDeposits	7,789us-gaap_InterestExpenseTimeDeposits	6,381us-gaap_InterestExpenseTimeDeposits
Other borrowed funds	142us-gaap_InterestExpenseBorrowings	418us-gaap_InterestExpenseBorrowings	619us-gaap_InterestExpenseBorrowings
Total interest expense	9,428us-gaap_InterestExpense	11,417us-gaap_InterestExpense	9,973us-gaap_InterestExpense
NET INTEREST INCOME	70,177us-gaap_InterestIncomeExpenseNet	57,042us-gaap_InterestIncomeExpenseNet	51,608us-gaap_InterestIncomeExpenseNet
PROVISION FOR LOAN LOSSES	2,693us-gaap_ProvisionForLoanLossesExpensed	2,373us-gaap_ProvisionForLoanLossesExpensed	8,060us-gaap_ProvisionForLoanLossesExpensed
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	67,484	54,669	43,548
NONINTEREST INCOME:
Customer service fees	2,655us-gaap_FeesAndCommissions	1,826us-gaap_FeesAndCommissions	1,699us-gaap_FeesAndCommissions
Loan fees	1,917gnbc_LoanFees	1,270gnbc_LoanFees	930gnbc_LoanFees
Gain (loss) on sale of available-for-sale securities, net		(7)	950
Gain on sale of held-for-sale loans, net	28us-gaap_GainLossOnSaleOfMortgageLoans
Gain on sale of guaranteed portion of loans	2,867us-gaap_GainLossOnSaleOfLoansAndLeases	1,229us-gaap_GainLossOnSaleOfLoansAndLeases
Bargain purchase gain			578
Other	589	494	952
Total noninterest income	8,056us-gaap_NoninterestIncome	4,812us-gaap_NoninterestIncome	5,109us-gaap_NoninterestIncome
NONINTEREST EXPENSE:
Salaries and employee benefits	31,102us-gaap_LaborAndRelatedExpense	25,618us-gaap_LaborAndRelatedExpense	22,021us-gaap_LaborAndRelatedExpense
Occupancy	5,028us-gaap_OccupancyNet	4,725us-gaap_OccupancyNet	4,194us-gaap_OccupancyNet
Professional and regulatory fees	5,647gnbc_ProfessionalAndRegulatoryFees	3,224gnbc_ProfessionalAndRegulatoryFees	3,506gnbc_ProfessionalAndRegulatoryFees
Data processing	5,353	1,429	1,826
Software license and maintenance	1,424us-gaap_AmortizationOfDeferredCharges	965us-gaap_AmortizationOfDeferredCharges	750us-gaap_AmortizationOfDeferredCharges
Marketing	654us-gaap_MarketingExpense	605us-gaap_MarketingExpense	626us-gaap_MarketingExpense
Loan related	523us-gaap_LoanProcessingFee	813us-gaap_LoanProcessingFee	584us-gaap_LoanProcessingFee
Real estate acquired by foreclosure, net	286us-gaap_ForeclosedRealEstateExpense	(595)us-gaap_ForeclosedRealEstateExpense	107us-gaap_ForeclosedRealEstateExpense
Other	2,416us-gaap_OtherNoninterestExpense	3,181us-gaap_OtherNoninterestExpense	2,128us-gaap_OtherNoninterestExpense
Total noninterest expense	52,433us-gaap_NoninterestExpense	39,965us-gaap_NoninterestExpense	35,742us-gaap_NoninterestExpense
INCOME BEFORE INCOME TAXES	23,107	19,516	12,915
PROVISION FOR INCOME TAXES	8,365us-gaap_IncomeTaxExpenseBenefit	6,906us-gaap_IncomeTaxExpenseBenefit	4,380us-gaap_IncomeTaxExpenseBenefit
NET INCOME	$ 14,742us-gaap_NetIncomeLoss	$ 12,610us-gaap_NetIncomeLoss	$ 8,535us-gaap_NetIncomeLoss
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.65us-gaap_EarningsPerShareBasic	$ 0.61us-gaap_EarningsPerShareBasic	$ 0.44us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.64us-gaap_EarningsPerShareDiluted	$ 0.60us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted

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Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.

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Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.

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The net amount of operating interest income (expense).

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Interest income on federal funds sold. Federal funds sold represent the excess federal funds held by one commercial bank which it lends to another commercial bank, usually at an agreed-upon (federal funds) rate of interest. Such loans generally are of short-duration (overnight).

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The aggregate interest income earned from (1) the lending of excess federal funds to another commercial bank requiring such for its legal reserve requirements and (2) securities purchased under agreements to resell.

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The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

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Expenses paid for obtaining loans which includes expenses such as application and origination fees.

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Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Total aggregate amount of all noninterest expense.

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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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Represents other forms of revenue earned, excluding interest, which is not otherwise specified in the taxonomy.

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Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.

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Other noninterest expenses that are not separately presented in any other noninterest expense category.

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Amount of expense related to loss from loan transactions.

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