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Investment Securities (Amortized cost and fair value of debt securities classified as available-for-sale and held-to-maturity, by contractual maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available-for-sale:    
Due in one year, amortized cost     
Due after one year through five years, amortized cost     
Due after five years through ten years, amortized cost     
Total debt securities, amortized cost 903  
Available-for-sale Securities, amortized cost 1,032 1,223
Due in one year, fair value     
Due after one year through five years, fair value     
Due after five years through ten years, fair value     
Total debt securities, fair value 959  
Available-for-sale Securities, fair value 1,088 1,281
Held-to-maturity:    
Due in one year, amortized cost     
Due after one year through five years, amortized cost 250  
Due after five years through ten years, amortized cost 3,105  
Held-to-maturity Securities, amortized cost 12,399 17,209
Due in one year, fair value     
Due after one year through five years, fair value 270  
Due after five years through ten years, fair value 3,256  
Held-to-maturity Securities, fair value 13,074 17,738
Government Sponsored Enterprises residential mortgage-backed securities [Member]
   
Available-for-sale:    
Available-for-sale Securities, debt maturities, without single maturity date, amortized cost 903  
Available-for-sale Securities, amortized cost 903 1,094
Available-for-sale Securities, debt maturities, without single maturity date, fair value 959  
Available-for-sale Securities, fair value 959 1,152
Held-to-maturity:    
Held-to-maturity Securities, debt maturities, without single maturity date, net carrying amount 9,044  
Held-to-maturity Securities, amortized cost 9,044 9,678
Held-to-maturity Securities, debt maturities, without single maturity date, fair value 9,548  
Held-to-maturity Securities, fair value 9,548 10,049
Investments in money market funds [Member]
   
Available-for-sale:    
Available-for-sale Securities, amortized cost 129 129
Available-for-sale Securities, fair value $ 129 $ 129