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Employee Benefit and Stock Compensation Plans Benefits (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation $ 2,426 $ 2,614 $ 2,406
Defined Benefit Plan, Interest Cost 106 122 131
Defined Benefit Plan, Actuarial Gain (Loss) 53 272  
Defined Benefit Plan, Benefits Paid (390) (179)  
Defined Benefit Plan, Settlements, Benefit Obligation 43 (7)  
Defined Benefit Plan, Fair Value of Plan Assets 2,023 2,251 2,115
Defined Benefit Plan, Actual Return on Plan Assets Still Held 160 72  
Defined Benefit Plan, Contributions by Employer 0 250  
Fair Value plan assets benefits paid (190) (179)  
Defined Benefit Plan, Settlements, Plan Assets (198) (7)  
Defined Benefit Plan, Funded Status of Plan (403) (363)  
Pension and Other Postretirement Defined Benefit Plans, Liabilities $ (403) $ (363)