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Investment Securities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
The amortized cost and fair value of debt securities    
Amortized cost $ 227,889 $ 194,893
Gross unrealized gains 4,464 5,381
Gross unrealized losses 362 28
Fair value, Total 231,991 200,246
U.S. Treasury [Member]
   
The amortized cost and fair value of debt securities    
Amortized cost 2,000 2,000
Gross unrealized gains 23 30
Gross unrealized losses 0 0
Fair value, Total 2,023 2,030
Government sponsored enterprises [Member]
   
The amortized cost and fair value of debt securities    
Amortized cost 68,869 54,327
Gross unrealized gains 728 853
Gross unrealized losses 21 0
Fair value, Total 69,576 55,180
Asset-backed securities [Member]
   
The amortized cost and fair value of debt securities    
Amortized cost 122,624 104,607
Gross unrealized gains 2,594 3,276
Gross unrealized losses 300 11
Fair value, Total 124,918 107,872
Obligations of states and political subdivisions [Member]
   
The amortized cost and fair value of debt securities    
Amortized cost 34,396 33,959
Gross unrealized gains 1,119 1,222
Gross unrealized losses 41 17
Fair value, Total $ 35,474 $ 35,164