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Resale and Repurchase Agreements (Details 2) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Resale and Repurchase Agreements    
Fair value of financial instruments held as collateral that the entity was permitted to deliver or repledge   $ 137,900,000
Details on the composition of the outstanding repurchase agreements    
Carrying value of securities sold under agreements to repurchase 0 159,386,000
U.S. government and federal agency obligations
   
Details on the composition of the outstanding repurchase agreements    
Carrying value of securities sold under agreements to repurchase   159,386,000
Overnight | U.S. government and federal agency obligations
   
Details on the composition of the outstanding repurchase agreements    
Fair value of collateral held that has been repledged   106,991,000
Less than 30 days | U.S. government and federal agency obligations
   
Details on the composition of the outstanding repurchase agreements    
Fair value of collateral held that has been repledged   50,052,000
On Demand | U.S. government and federal agency obligations
   
Details on the composition of the outstanding repurchase agreements    
Fair value of collateral held that has been repledged   $ 2,343,000