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Investment Securities (Details 2) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Gross unrealized losses on debt securities and the fair value of the related securities    
Fair Value, Less than 12 months $ 66,606,000 $ 7,887,000
Fair Value, 12 months or more 892,000 150,000
Fair Value, Total 67,498,000 8,037,000
Unrealized Losses, Less than 12 months (352,000) (28,000)
Unrealized Losses, 12 months or more (10,000) (98)
Unrealized Losses, Total (362,000) (28,000)
Government sponsored enterprises [Member]
    
Gross unrealized losses on debt securities and the fair value of the related securities    
Fair Value, Less than 12 months 20,569,000 1,044,000
Fair Value, 12 months or more 0 0
Fair Value, Total 20,569,000 1,044,000
Unrealized Losses, Less than 12 months (21,000) 0
Unrealized Losses, 12 months or more 0 0
Unrealized Losses, Total (21,000) 0
Asset-backed securities [Member]
    
Gross unrealized losses on debt securities and the fair value of the related securities    
Fair Value, Less than 12 months 42,235,000 4,729,000
Fair Value, 12 months or more 892,000 0
Fair Value, Total 43,127,000 4,729,000
Unrealized Losses, Less than 12 months (290,000) (11,000)
Unrealized Losses, 12 months or more (10,000) 0
Unrealized Losses, Total (300,000) (11,000)
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 3,802,000 2,114,000
Fair Value, 12 months or more 0 150,000
Fair Value, Total 3,802,000 2,264,000
Unrealized Losses, Less than 12 months (41,000) (17,000)
Unrealized Losses, 12 months or more 0 0
Unrealized Losses, Total $ (41,000) $ (17,000)