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Investment Securities (Details Textual) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2009
Dec. 31, 2011
Mar. 31, 2012
CMO's / REMIC's - Residential [Member]
Y
Feb. 29, 2008
CMO's / REMIC's - Residential [Member]
Dec. 31, 2006
CMO's / REMIC's - Residential [Member]
Security
Score
Mar. 31, 2012
Municipal Bonds [Member]
Y
Investments Securities (Textual) [Abstract]                
Securities issued by U.S Government, Percentage 72.00%              
Gross realized gain $ 0 $ 0            
Gross realized losses 0 0            
CMO/REMIC's backed by whole loans issued by private-label companies (non-government sponsored)         4,000,000      
Investment security classified as held-to-maturity, number             1  
Held-to-maturity securities, average FICO score             715  
Investment securities held-to-maturity 2,280,000     2,383,000 2,300,000      
Held-to-maturity securities, acquired price, percentage           98.25%    
Fair value percentage of held-to-maturity security against par value         57.00%      
Average percentage of LTV             71.00%  
Average life of investment grade debt securities, years         3.0     9.8
Investment contractual cash flows guaranteed by Government, percentage         99.76%      
Investment contractual cash flows guaranteed by banks, percentage         0.24%      
Gross Unrealized Holding Losses         0      
Loss on securities greater than 12 months               0
Investment securities pledged as collateral 2,300,000,000     1,850,000,000        
Contractual maturity, years         30 years      
Impairment loss         0      
Impairment loss on investment securities     2,000,000          
Non Credit Portion reflected in other comprehensive income     1,700,000          
Credit-related impairment loss on investment securities held-to-maturity     323,000          
Net impairment losses $ 2,300,000     $ 1,900,000