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Note 10 - Borrowings (Details) (USD $) | 16 Months Ended | 37 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 02, 2013 | Dec. 31, 2014 | Aug. 05, 2014 | Dec. 31, 2013
Note 10 - Borrowings (Details) [Line Items] |  |  |  |  |
Long-term Line of Credit | $ 105,895,000 us-gaap_LineOfCredit |  | 105,895,000 us-gaap_LineOfCredit |  | $ 79,786,000 us-gaap_LineOfCredit
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 185,300,000 us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch |  | 185,300,000 us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch |  |
Subordinated Debt | 9,300,000 us-gaap_SubordinatedDebt |  | 9,300,000 us-gaap_SubordinatedDebt |  |
Subordinated Borrowing, Interest Rate | 8.50%us-gaap_SubordinatedBorrowingInterestRate | 10.00%us-gaap_SubordinatedBorrowingInterestRate |  |  |
Phase Out of New Notes Capital Treatment | 20.00%egbn_PhaseOutOfNewNotesCapitalTreatment |  | 20.00%egbn_PhaseOutOfNewNotesCapitalTreatment |  |
Subordinated Notes [Member] | Current Yield on 5 Year U.S. Treasury Note [Member] |  |  |  |  |
Note 10 - Borrowings (Details) [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 7.03%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = egbn_SubordinatedNotesMember / us-gaap_VariableRateAxis = egbn_CurrentYieldOn5YearUSTreasuryNoteMember |  |
Subordinated Notes [Member] |  |  |  |  |
Note 10 - Borrowings (Details) [Line Items] |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  | 70,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_LongtermDebtTypeAxis = egbn_SubordinatedNotesMember |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = egbn_SubordinatedNotesMember |
Proceeds from Issuance of Subordinated Long-term Debt |  |  |  | 68,800,000 us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt / us-gaap_LongtermDebtTypeAxis = egbn_SubordinatedNotesMember |
Deferred Finance Costs, Net |  |  |  | 1,200,000 us-gaap_DeferredFinanceCostsNet / us-gaap_LongtermDebtTypeAxis = egbn_SubordinatedNotesMember |
Federal Funds [Member] |  |  |  |  |
Note 10 - Borrowings (Details) [Line Items] |  |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount | 137,500,000 us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_DebtInstrumentAxis = egbn_FederalFundsMember |  | 137,500,000 us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_DebtInstrumentAxis = egbn_FederalFundsMember |  |
Federal Funds [Member] |  |  |  |  |
Note 10 - Borrowings (Details) [Line Items] |  |  |  |  |
Long-term Line of Credit | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_FederalFundsMember |  | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_FederalFundsMember |  |
CDARS [Member] |  |  |  |  |
Note 10 - Borrowings (Details) [Line Items] |  |  |  |  |
Long-term Line of Credit | 14,300,000 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_CDARSMember |  | 14,300,000 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_CDARSMember |  |
Line of Credit Facility, Maximum Borrowing Capacity | 784,400,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_CDARSMember |  | 784,400,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_CDARSMember |  |
IND [Member] |  |  |  |  |
Note 10 - Borrowings (Details) [Line Items] |  |  |  |  |
Long-term Line of Credit | 246,900,000 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_INDMember |  | 246,900,000 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_INDMember |  |
Line of Credit Facility, Maximum Borrowing Capacity | 300,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_INDMember |  | 300,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_INDMember |  |
Federal Reserve Bank of Richmond [Member] |  |  |  |  |
Note 10 - Borrowings (Details) [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 409,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_FederalReserveBankOfRichmondMember |  | 409,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_FederalReserveBankOfRichmondMember |  |
Loan Agreement and Related Stock Security Agreement [Member] | Prime Rate [Member] |  |  |  |  |
Note 10 - Borrowings (Details) [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember |  |
Loan Agreement and Related Stock Security Agreement [Member] |  |  |  |  |
Note 10 - Borrowings (Details) [Line Items] |  |  |  |  |
Long-term Line of Credit | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember |  | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember |  | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember
Line of Credit Facility, Maximum Borrowing Capacity | 50,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember |  | 50,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  |  | 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_CreditFacilityAxis = egbn_LoanAgreementAndRelatedStockSecurityAgreementMember |  |
Maximum [Member] |  |  |  |  |
Note 10 - Borrowings (Details) [Line Items] |  |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | $ 576,400,000 us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 576,400,000 us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Subparagraph b -Article 5 + Details
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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition Amount of advances from the Federal Home Loan Bank (FHLB). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
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