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Fair Value Measurement - Fair Value, Narrative (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Fair Value Disclosures [Abstract]        
Value of mortgage-backed securities purchased at premium (in hundredths) 111.111%   111.111%  
Loss on sale of securities carried at fair value through income $ 0 $ 13 $ 0 $ 498