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Fair Value Measurements Fair Value on a Non-recurring basis (Details) (USD $)
Mar. 31, 2013
Mar. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans Held-for-sale, Fair Value Disclosure $ 13,107,000 $ 29,626,000
Impaired Loans with Specific Reserve Allocated 13,397,000 17,784,000
Other Real Estate, Foreclosed Assets, and Repossessed Assets 2,386,000 2,183,000
Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans Held-for-sale, Fair Value Disclosure 0 0
Impaired Loans with Specific Reserve Allocated 0 0
Other Real Estate, Foreclosed Assets, and Repossessed Assets 0 0
Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans Held-for-sale, Fair Value Disclosure 13,107,000 29,626,000
Impaired Loans with Specific Reserve Allocated 0 0
Other Real Estate, Foreclosed Assets, and Repossessed Assets 2,386,000 2,183,000
Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans Held-for-sale, Fair Value Disclosure 0 0
Impaired Loans with Specific Reserve Allocated 13,397,000 17,784,000
Other Real Estate, Foreclosed Assets, and Repossessed Assets $ 0 $ 0