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Deposits Deposit Interest Expense (Details) (USD $)
In Thousands, unless otherwise specified
 4 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Interest Expense [Line Items]        
Interest Expense, Negotiable Order of Withdrawal (NOW) Deposits   $ 42 $ 42 $ 101
Interest Expense, Deposits   3,508 4,023 5,529
Interest Expense, Savings Deposits   259 274 286
Interest Expense, Money Market Deposits   739 838 795
Interest Expense, Time Deposits   2,441 2,848 4,322
Interest Expense, Other Domestic Deposits   37 38 41
Interest Expense, NOW Accounts, Money Market Accounts, and Savings Deposits   3,518 4,040 5,545
Penalty for Early Withdrawal $ 353 $ (10) $ (17) $ (16)