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Fair Value Measurements Assets classified within Level 3 valuation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Assets Classified with Level 3 valuation [Line Items]      
Available-for-sale Securities $ 116,100    
Available-for-sale Securities, Gross Unrealized Gain (Loss) 1,064    
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities 44,830 23,854 70,993
Servicing Contracts [Member]
      
Assets Classified with Level 3 valuation [Line Items]      
Change in unrealized gains and losses to instruments held (197) (121)  
Fair Value, Inputs, Level 3 [Member]
      
Assets Classified with Level 3 valuation [Line Items]      
Available-for-sale Securities 51 52 45
Available-for-sale Securities, Gross Unrealized Gain (Loss) (1) [1] 0 [1]  
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities 0 7  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net 0 0  
Servicing Asset at Fair Value, Amount 275 491 626
Mortgage Servicing unrealized loss (216) [1] (135) [1]  
Payments for (Proceeds from) Mortgage Servicing Rights 0 0  
Available-for-sale Securities [Member]
      
Assets Classified with Level 3 valuation [Line Items]      
Change in unrealized gains and losses to instruments held $ 0 $ 0  
[1] Includes net servicing cash flows and the passage of time.