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Junior Subordinated Debt/Trust Preferred Securities (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Debt Instrument [Line Items]        
Pretax loss adjustment related to fair value calculations $ 141,000 $ (171,000) $ (519,000) $ (284,000)
Adjustment related to fair value calculations net of tax 83,000 (101,000) (305,000) (133,000)
Junior Subordinated Debt [Member]
       
Debt Instrument [Line Items]        
Amount of junior subordinated debentures relating to trust preferred securities $ 15,000,000.0   $ 15,000,000.0  
Maximum number of consecutive quarters the entity defer interest payments without default or penalty     20  
Rate paid on junior subordinated debt issued under USB Capital Trust II and adjusted quarterly     3-month LIBOR plus 129 basis points  
Basis spread on LIBOR     1.29%  
Life of debt instrument     30 years  
Discount rate used in the valuation of debt instrument (in hundredths)     8.08%