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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Details      
Outstanding commitments to extend credit $ 17,100fil_OutstandingCommitmentsToExtendCredit    
Unused lines of credit 60,400fil_UnusedLinesOfCredit    
Undisbursed construction loans 21,600fil_UndisbursedConstructionLoans    
Standby letters of credit 1,100fil_StandbyLettersOfCredit1 771,000fil_StandbyLettersOfCredit1  
Loans under warranty 117,700fil_LoansUnderWarranty    
Loans and Leases Receivable, Commitments to Purchase or Sell 2,100us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell [1]    
Losses related to public depository funds $ 0fil_LossesRelatedToPublicDepositoryFunds $ 0fil_LossesRelatedToPublicDepositoryFunds $ 0fil_LossesRelatedToPublicDepositoryFunds
[1] Commitments to sell residential loans to the FHLMC. Typically, these agreements are short term fixed rate commitments and no material gain or loss is likely.