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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
Jun. 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 973  
Available-for-sale Securities, amortized cost 1,102 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 1,031  
Available-for-sale Securities, fair value 1,160 1,281
Held-to-maturity:    
Due in one year, amortized cost     
Due after one year through five years, amortized cost 3,640  
Due after five years through ten years, amortized cost     
Held-to-maturity Securities, amortized cost 13,081 17,209
Due in one year, fair value     
Due after one year through five years, fair value 3,797  
Due after five years through ten years, fair value     
Held-to-maturity Securities, fair value 13,692 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 973  
Available-for-sale Securities, amortized cost   1,094
Available-for-sale Securities, debt maturities, without single maturity date, fair value 1,031  
Available-for-sale Securities, fair value 1,031 1,152
Held-to-maturity:    
Held-to-maturity Securities, debt maturities, without single maturity date, net carrying amount 9,441  
Held-to-maturity Securities, amortized cost   9,678
Held-to-maturity Securities, debt maturities, without single maturity date, fair value 9,895  
Held-to-maturity Securities, fair value   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