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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Mortgage servicing rights [Member]
    
Assets:    
Assets, Total $ 2,549 $ 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets:    
Assets, Total 66,097 50,605
Other Observable Inputs (Level 2) [Member]
    
Assets:    
Assets, Total 202,630 216,554
Significant Unobservable Inputs (Level 3) [Member]
    
Assets:    
Assets, Total 837,373 832,589
Recurring [Member]
    
Assets:    
Assets, Total 202,795 213,806
Recurring [Member] | U.S. Treasury [Member]
    
Assets:    
Assets, Total 2,030 2,054
Recurring [Member] | Government sponsored enterprises [Member]
    
Assets:    
Assets, Total 55,180 70,314
Recurring [Member] | Asset-backed securities [Member]
    
Assets:    
Assets, Total 107,872 107,329
Recurring [Member] | Obligations of states and political subdivisions [Member]
    
Assets:    
Assets, Total 35,164 34,109
Recurring [Member] | Mortgage servicing rights [Member]
    
Assets:    
Assets, Total 2,549  
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets:    
Assets, Total 2,030 2,054
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury [Member]
    
Assets:    
Assets, Total 2,030 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 198,216 211,752
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 55,180 70,314
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Asset-backed securities [Member]
    
Assets:    
Assets, Total 107,872 107,329
Recurring [Member] | Other Observable Inputs (Level 2) [Member] | Obligations of states and political subdivisions [Member]
    
Assets:    
Assets, Total 35,164 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 2,549 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 $ 2,549