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Fair Values - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value $ 53,932 $ 67,900
Nonrecurring basis
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value 53,932 67,882
Mortgage Servicing Rights 6,642 5,815
Other loans 19,926 23,722
Nonrecurring basis | Level 1
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value      
Mortgage Servicing Rights      
Other loans 0 0
Nonrecurring basis | Level 2
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value      
Mortgage Servicing Rights 6,642 5,815
Other loans 0 0
Nonrecurring basis | Level 3
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value 53,932 67,882
Mortgage Servicing Rights      
Other loans 19,926 23,722
Nonrecurring basis | Commercial real estate
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value 25,997 24,859
Other loans 3,485 6,062
Nonrecurring basis | Commercial real estate | Level 1
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value      
Other loans 0 0
Nonrecurring basis | Commercial real estate | Level 2
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value      
Other loans 0 0
Nonrecurring basis | Commercial real estate | Level 3
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value 25,997 24,859
Other loans 3,485 6,062
Nonrecurring basis | Construction real estate
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Other loans 12,134 10,834
Nonrecurring basis | Construction real estate | Level 1
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Other loans 0 0
Nonrecurring basis | Construction real estate | Level 2
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Other loans 0 0
Nonrecurring basis | Construction real estate | Level 3
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Other loans 12,134 10,834
Nonrecurring basis | SEPH commercial land and development
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value 12,832  
Nonrecurring basis | SEPH commercial land and development | Level 1
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value     
Nonrecurring basis | SEPH commercial land and development | Level 2
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value     
Nonrecurring basis | SEPH commercial land and development | Level 3
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value 12,832  
Nonrecurring basis | Vision commercial land and development
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value   21,228
Nonrecurring basis | Vision commercial land and development | Level 1
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value     
Nonrecurring basis | Vision commercial land and development | Level 2
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value     
Nonrecurring basis | Vision commercial land and development | Level 3
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value   21,228
Nonrecurring basis | Remaining commercial
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value 8,113 8,860
Nonrecurring basis | Remaining commercial | Level 1
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value      
Nonrecurring basis | Remaining commercial | Level 2
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value      
Nonrecurring basis | Remaining commercial | Level 3
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value 8,113 8,860
Nonrecurring basis | Residential real estate
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value 6,990 12,935
Other loans 4,307 6,826
Nonrecurring basis | Residential real estate | Level 1
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value      
Other loans 0 0
Nonrecurring basis | Residential real estate | Level 2
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value      
Other loans 0 0
Nonrecurring basis | Residential real estate | Level 3
    
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Impaired loans carried at fair value 6,990 12,935
Other loans $ 4,307 $ 6,826