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Investment Securities (Details 3) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
item
Dec. 31, 2012
item
Fair Value    
Less than 12 months $ 110,415,000 $ 7,887,000
12 months or more 842,000 150,000
Total 111,257,000 8,037,000
Unrealized Losses    
Less than 12 months (3,107,000) (28,000)
12 months or more (15,000)  
Total (3,122,000) (28,000)
Other disclosure    
Number of securities consisted in portfolio 350 380
Number of securities in loss position 105 14
Unrealized loss included in other comprehensive 3,122,000 28,000
Government sponsored enterprises
    
Fair Value    
Less than 12 months 30,857,000 1,044,000
Total 30,857,000 1,044,000
Unrealized Losses    
Less than 12 months (718,000)  
Total (718,000)  
Asset-backed securities
    
Fair Value    
Less than 12 months 69,425,000 4,729,000
12 months or more 842,000  
Total 70,267,000 4,729,000
Unrealized Losses    
Less than 12 months (2,117,000) (11,000)
12 months or more (15,000)  
Total (2,132,000) (11,000)
Obligations of states and political subdivisions
    
Fair Value    
Less than 12 months 10,133,000 2,114,000
12 months or more   150,000
Total 10,133,000 2,264,000
Unrealized Losses    
Less than 12 months (272,000) (17,000)
Total $ (272,000) $ (17,000)