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Investment Securities (Details 3) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Gross unrealized losses on debt securities and the fair value of the related securities    
Fair Value, Less than 12 months $ 7,446,000 $ 18,070,000
Fair Value, 12 months or more 150,000 150,000
Fair Value, Total 7,596,000 18,220,000
Unrealized Losses, Less than 12 months (12,000) (43,000)
Unrealized Losses, 12 months or more 0 0
Unrealized Losses, Total (12,000) (43,000)
Number of Investment Positions 12,000 20,000
Government sponsored enterprises [Member]
    
Gross unrealized losses on debt securities and the fair value of the related securities    
Fair Value, Less than 12 months   13,250,000
Fair Value, 12 months or more   0
Fair Value, Total   13,250,000
Unrealized Losses, Less than 12 months   (18,000)
Unrealized Losses, 12 months or more   0
Unrealized Losses, Total   (18,000)
Number of Investment Positions   13,000
Asset-backed securities [Member]
    
Gross unrealized losses on debt securities and the fair value of the related securities    
Fair Value, Less than 12 months 5,257,000 4,591,000
Fair Value, 12 months or more 0 0
Fair Value, Total 5,257,000 4,591,000
Unrealized Losses, Less than 12 months (7,000) (24,000)
Unrealized Losses, 12 months or more 0 0
Unrealized Losses, Total (7,000) (24,000)
Number of Investment Positions 5,000 5,000
Obligations of states and political subdivisions [Member]
    
Gross unrealized losses on debt securities and the fair value of the related securities    
Fair Value, Less than 12 months 2,189,000 229,000
Fair Value, 12 months or more 150,000 150,000
Fair Value, Total 2,339,000 379,000
Unrealized Losses, Less than 12 months (5,000) (1,000)
Unrealized Losses, 12 months or more 0 0
Unrealized Losses, Total (5,000) (1,000)
Number of Investment Positions $ 7,000 $ 2,000