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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Mortgage Servicing Rights [Member]
      
Assets:      
Assets, Total $ 2,624 $ 2,666 $ 2,512
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
      
Assets:      
Assets, Total 27,789    
Other Observable Inputs (Level 2) [Member]
      
Assets:      
Assets, Total 219,509    
Significant Unobservable Inputs (Level 3) [Member]
      
Assets:      
Assets, Total 833,025    
Recurring [Member]
      
Assets:      
Assets, Total 219,412   213,806
Recurring [Member] | U.S. treasury [Member]
      
Assets:      
Assets, Total 2,036   2,054
Recurring [Member] | Government sponsored enterprises [Member]
      
Assets:      
Assets, Total 66,327   70,314
Recurring [Member] | Asset-backed securities [Member]
      
Assets:      
Assets, Total 113,206   107,329
Recurring [Member] | Obligations of states and political subdivisions [Member]
      
Assets:      
Assets, Total 35,219   34,109
Recurring [Member] | Mortgage Servicing Rights [Member]
      
Assets:      
Assets, Total 2,624    
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
      
Assets:      
Assets, Total 2,036   2,054
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. treasury [Member]
      
Assets:      
Assets, Total 2,036   2,054
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Government sponsored enterprises [Member]
      
Assets:      
Assets, Total 0   0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Asset-backed securities [Member]
      
Assets:      
Assets, Total 0   0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Obligations of states and political subdivisions [Member]
      
Assets:      
Assets, Total 0   0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage Servicing Rights [Member]
      
Assets:      
Assets, Total 0    
Recurring [Member] | Other Observable Inputs (Level 2) [Member]
      
Assets:      
Assets, Total 214,752   211,752
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | U.S. treasury [Member]
      
Assets:      
Assets, Total 0   0
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Government sponsored enterprises [Member]
      
Assets:      
Assets, Total 66,327   70,314
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Asset-backed securities [Member]
      
Assets:      
Assets, Total 113,206   107,329
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Obligations of states and political subdivisions [Member]
      
Assets:      
Assets, Total 35,219   34,109
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Mortgage Servicing Rights [Member]
      
Assets:      
Assets, Total 0    
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
      
Assets:      
Assets, Total 2,624   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. treasury [Member]
      
Assets:      
Assets, Total 0   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Government sponsored enterprises [Member]
      
Assets:      
Assets, Total 0   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Asset-backed securities [Member]
      
Assets:      
Assets, Total 0   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Obligations of states and political subdivisions [Member]
      
Assets:      
Assets, Total 0   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]
      
Assets:      
Assets, Total $ 2,624