Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows From Operating Activities:
Net Income	$ 54,258us-gaap_NetIncomeLoss	$ 47,007us-gaap_NetIncomeLoss	$ 35,289us-gaap_NetIncomeLoss
Provision for credit losses	10,879	9,602	16,190
Depreciation and amortization	5,049	4,227	3,390
Gains on sale of loans	(6,886)us-gaap_GainLossOnSaleOfLoansAndLeases	(14,578)us-gaap_GainLossOnSaleOfLoansAndLeases	(13,942)us-gaap_GainLossOnSaleOfLoansAndLeases
Securities premium amortization (discount accretion), net	3,456	3,162	8,734
Origination of loans held for sale	(572,342)	(983,332)	(1,471,248)
Proceeds from sale of loans held for sale	576,941	1,182,803	1,435,093
Net increase in cash surrender value of BOLI	(1,283)us-gaap_BankOwnedLifeInsuranceIncome	(720)us-gaap_BankOwnedLifeInsuranceIncome	(392)us-gaap_BankOwnedLifeInsuranceIncome
Increase in deferred income taxes	(3,562)	(3,965)	(4,848)
Decrease in fair value of other real estate owned	638us-gaap_ImpairmentOfRealEstate
Net loss (gain) on sale of other real estate owned	153	772	(26)
Net gain on sale of investment securities	(22)us-gaap_GainLossOnSaleOfSecuritiesNet	(19)us-gaap_GainLossOnSaleOfSecuritiesNet	(690)us-gaap_GainLossOnSaleOfSecuritiesNet
Loss on early extinguishment of debt			529
Stock-based compensation expense	3,981	3,304	2,495
Excess tax benefits from stock-based compensation	(978)	(410)	(369)
(Increase) decrease in other assets	(12,631)	(26)	3,797
Increase in other liabilities	1,856	10,850	1,818
Net cash provided by operating activities	59,507	258,677	15,820
Cash Flows From Investing Activities:
(Increase) decrease in interest bearing deposits with other banks and short-term investments	(634)	(88)	11
Purchases of available for sale investment securities	(50,404)	(148,373)	(117,554)
Proceeds from maturities of available for sale securities	37,571	35,985	47,007
Proceeds from sale/call of available for sale securities	49,902	22,148	77,084
Purchases of Federal Reserve and Federal Home Loan Bank stock	(5,650)	(731)	(2,776)
Proceeds from redemption of Federal Reserve and Federal Home Loan Bank stock	1,374	153	2,324
Net increase in loans	(595,437)us-gaap_IncreaseDecreaseInOtherLoans	(474,542)us-gaap_IncreaseDecreaseInOtherLoans	(447,557)us-gaap_IncreaseDecreaseInOtherLoans
Proceeds from sale of other real estate owned	520	6,783	901
Proceeds from redemption of BOLI		95
Purchases of BOLI	(1,058)	(25,603)
Purchases of annuities		(11,227)egbn_PaymentToAcquireAnnuity
Acquisition of Virginia Heritage, net of cash	(156,581)
Bank premises and equipment acquired	(5,328)	(5,336)	(6,007)
Net cash used in investing activities	(725,725)	(600,736)	(446,567)
Cash Flows From Financing Activities:
Increase in deposits	384,443us-gaap_IncreaseDecreaseInDeposits	328,192us-gaap_IncreaseDecreaseInDeposits	504,803us-gaap_IncreaseDecreaseInDeposits
Decrease in customer repurchase agreements	(19,351)	(20,867)	(2,024)
Issuance of Series C Preferred Stock	15,300
Issuance of common stock	144,093		42,956
Increase in short-term borrowings	7,500
Increase (decrease) in long-term borrowings	80,000		(10,000)
Payment of dividends on preferred stock	(614)	(566)	(566)
Proceeds from exercise of stock options	2,313	1,984	1,685
Excess tax benefits from stock-based compensation	978	410	369
Payment in lieu of fractional shares		(11)
Proceeds from employee stock purchase plan	621us-gaap_ProceedsFromStockPlans	543us-gaap_ProceedsFromStockPlans	447us-gaap_ProceedsFromStockPlans
Net cash provided by financing activities	615,283	309,685	537,670
Net (Decrease) Increase In Cash and Cash Equivalents	(50,935)	(32,374)	106,923
Cash and Cash Equivalents at Beginning of Period	306,960	339,334	232,411
Cash and Cash Equivalents at End of Period	256,025	306,960	339,334
Supplemental Cash Flows Information:
Interest paid	11,742us-gaap_InterestPaid	12,910us-gaap_InterestPaid	14,935us-gaap_InterestPaid
Income taxes paid	33,050us-gaap_IncomeTaxesPaid	23,945us-gaap_IncomeTaxesPaid	18,151us-gaap_IncomeTaxesPaid
Non-Cash Investing Activities
Transfers from loans to other real estate owned	5,310us-gaap_TransferToOtherRealEstate	14,842us-gaap_TransferToOtherRealEstate	3,955us-gaap_TransferToOtherRealEstate
Transfers from other real estate owned to loans		$ 3,361us-gaap_TransferOfOtherRealEstate

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