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Fair Market Value of Financial Assets and Liabilities, Transfers between Levels (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
U.S. government sponsored agency mortgage-backed securities [Member]
  
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]  
Fair Value, Assets, Level 1 to Level 2 Transfers, Description Quoted prices in exact security not available on the measurement date
Fair Value, Assets, Level 2 to Level 1 Transfers, Description Quoted prices in exact security not available on the measurement date
Marketable equity securities [Member]
  
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]  
Fair Value, Assets, Level 1 to Level 2 Transfers, Description Quoted prices available on the measurement date
Fair Value, Assets, Level 2 to Level 1 Transfers, Description Quoted prices available on the measurement date
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
  
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 464
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 323
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. government sponsored agency mortgage-backed securities [Member]
  
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 464
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Marketable equity securities [Member]
  
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 323
Significant Other Observable Inputs (Level 2) [Member]
  
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 323
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 464
Significant Other Observable Inputs (Level 2) [Member] | U.S. government sponsored agency mortgage-backed securities [Member]
  
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 464
Significant Other Observable Inputs (Level 2) [Member] | Marketable equity securities [Member]
  
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 323
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0
Significant Unobservable Inputs (Level 3) [Member]
  
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0
Significant Unobservable Inputs (Level 3) [Member] | U.S. government sponsored agency mortgage-backed securities [Member]
  
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0
Significant Unobservable Inputs (Level 3) [Member] | Marketable equity securities [Member]
  
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount $ 0