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Short-Term Borrowings (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Summary of Short-Term Borrowings    
Total short-term borrowings $ 10,333 $ 18,779
Retail Repurchase Agreements [Member]
   
Summary of Short-Term Borrowings    
Securities sold under repurchase agreements 10,333 13,779
Brokerage Repurchase Agreements [Member]
   
Summary of Short-Term Borrowings    
Securities sold under repurchase agreements    $ 5,000