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Note 6 - Long-term Debt (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2017
Jun. 30, 2015
Dec. 31, 2010
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Sep. 30, 2005
Debt Instrument, Face Amount       $ 25,155,000   $ 15,155,000  
Subordinated Debt       24,782,000   $ 14,970,000  
Interest Expense, Long-term Debt       $ 272,000 $ 194,000    
Eagle Bancorp Statutory Trust I [Member]              
Subordinated Debt             $ 5,155,000
Eagle Bancorp Statutory Trust I [Member] | Subordinated Debt [Member]              
Debt Instrument, Interest Rate, Stated Percentage             6.02%
Eagle Bancorp Statutory Trust I [Member] | Variable Interest Rate Subordinated Debentures Due in 2035 [Member]              
Debt Instrument, Interest Rate, Effective Percentage       2.916%   2.418%  
Eagle Bancorp Statutory Trust I [Member] | Variable Interest Rate Subordinated Debentures Due in 2035 [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate     1.42%        
First Tennessee Bank, N.A. [Member]              
Temporary Equity, Liquidation Preference             $ 5,155,000
Trust Preferred Securities, Maximum Dividend Deferring Period       5 years      
Trust Preferred Securities, Maturity Month and Year       2035-12      
5.75% Senior Unsecured Notes Due February 15, 2022 [Member]              
Debt Instrument, Face Amount $ 10,000,000     $ 10,000,000    
Debt Instrument, Interest Rate, Stated Percentage 5.75%     5.75%      
Debt Instrument, Maturity Year 2022     2022      
6.75% Subordinated Notes Due in 2025 [Member]              
Debt Instrument, Face Amount   $ 10,000,000   $ 5,155,000   $ 5,155,000  
Debt Instrument, Interest Rate, Stated Percentage   6.75%          
Debt Instrument, Maturity Year   2025   2035   2035  
Debt Instrument, Basis Spread on Variable Rate       1.42%   1.42%