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Investment Securities Text Figures (Details)
 6 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Schedule of Investments [Line Items]    
Number of agencies with unrealized loss more than 12 months 7  
Available-for-sale $ 75,760,000 $ 101,185,000
Percentage Available-for-sale Securities 82.50%  
Held-to-maturity $ 16,087,000 11,922,000
Held-to-maturity Securities, Amortized Cost [1] $ 16,087,000 $ 11,922,000
Percentage Held-to-maturity Securities 17.50%  
Trading Securities $ 0  
Number of securities with unrealized loss 21 23
US Government Agency Securities    
Schedule of Investments [Line Items]    
Percentage Available-for-Sale, Continuos Unrealized Loss Position 53.00%  
Available-for-sale $ 43,140,000 $ 57,850,000
Mortgage-backed securities    
Schedule of Investments [Line Items]    
Percentage Available-for-Sale, Continuos Unrealized Loss Position 30.40%  
Number of MBS with unrealized loss more than 12 months 10  
Available-for-sale $ 21,871,000 27,019,000
Held-to-maturity Securities, Amortized Cost [1] $ 15,087,000 $ 11,922,000
[1] * The carrying amount and amortized cost are the same for all held-to-maturity securities, as no OTTI has been recorded.