Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows From Operating Activities:
Net Income	$ 19,418us-gaap_NetIncomeLoss	$ 12,499us-gaap_NetIncomeLoss
Provision for credit losses	3,310	1,934
Depreciation and amortization	2,931	1,119
Gains on sale of loans	(3,587)us-gaap_GainLossOnSaleOfLoansAndLeases	(1,843)us-gaap_GainLossOnSaleOfLoansAndLeases
Securities premium amortization (discount accretion), net	683	861
Origination of loans held for sale	(279,612)	(98,321)
Proceeds from sale of loans held for sale	264,758	120,332
Net increase in cash surrender value of BOLI	(390)us-gaap_BankOwnedLifeInsuranceIncome	(314)us-gaap_BankOwnedLifeInsuranceIncome
Decrease in deferred income taxes	422	1,803
Decrease in fair value of other real estate owned	750us-gaap_ImpairmentOfRealEstate	453us-gaap_ImpairmentOfRealEstate
Net loss on sale of other real estate owned	17	100
Net gain on sale of investment securities	(2,164)us-gaap_GainLossOnSaleOfSecuritiesNet	(8)us-gaap_GainLossOnSaleOfSecuritiesNet
Loss on early extinguishment of debt	1,130
Stock-based compensation expense	1,148	892
Excess tax benefits from stock-based compensation	(1,450)	(75)
Increase in other assets	(296)	(3,411)
Increase (decrease) in other liabilities	623	(18,311)
Net cash provided by operating activities	7,691	17,710
Cash Flows From Investing Activities:
Decrease (increase) in interest bearing deposits with other banks and short-term investments	295	(5)
Purchases of available for sale investment securities	(26,885)	(18,564)
Proceeds from maturities of available for sale securities	12,110	4,384
Proceeds from sale/call of available for sale securities	65,701	6,487
Purchases of Federal Reserve and Federal Home Loan Bank stock	(2,322)	(26)
Proceeds from redemption of Federal Reserve and Federal Home Loan Bank stock	8,100	699
Net increase in loans	(134,100)us-gaap_IncreaseDecreaseInOtherLoans	(119,871)us-gaap_IncreaseDecreaseInOtherLoans
Proceeds from sale of other real estate owned	153	108
Purchases of BOLI	(389)
Purchases of annuities	(992)egbn_PaymentToAcquireAnnuity
Bank premises and equipment acquired	(348)	(1,483)
Net cash used in investing activities	(78,677)	(128,271)
Cash Flows From Financing Activities:
Increase in deposits	273,597us-gaap_IncreaseDecreaseInDeposits	48,275us-gaap_IncreaseDecreaseInDeposits
Decrease in customer repurchase agreements	(2,531)	(14,034)
Issuance of common stock	94,698
Decrease in short-term borrowings	(100,000)
Decrease in long-term borrowings	(40,000)
Payment of dividends on preferred stock	(164)	(141)
Proceeds from exercise of stock options	3,439	250
Excess tax benefits from stock-based compensation	1,450	75
Payment in lieu of fractional shares	(4)
Proceeds from employee stock purchase plan	153us-gaap_ProceedsFromStockPlans	127us-gaap_ProceedsFromStockPlans
Net cash provided by financing activities	230,622	34,552
Net Increase (Decrease) In Cash and Cash Equivalents	159,636	(76,009)
Cash and Cash Equivalents at Beginning of Period	256,025	306,960
Cash and Cash Equivalents at End of Period	415,661	230,951
Supplemental Cash Flows Information:
Interest paid	6,045us-gaap_InterestPaid	3,022us-gaap_InterestPaid
Income taxes paid	8,350us-gaap_IncomeTaxesPaid	7,550us-gaap_IncomeTaxesPaid
Non-Cash Investing Activities
Transfers from loans to other real estate owned		$ 245us-gaap_TransferToOtherRealEstate

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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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