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Investment Securities Investment Securities Carrying Value (Amortized Cost) and Fair Value by remaining period of contractual maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis $ 5,983  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value $ 5,911  
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Weighted Average Rate 1.37%  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis $ 17,183  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value $ 16,814  
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Rate 2.03%  
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis $ 46,436  
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value $ 45,467  
Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Rate 1.60%  
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis $ 69,602  
Available-for-sale $ 68,192 $ 101,185
Available-for-sale Securities, Debt Maturities, Weighted Average Rate 1.69%  
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount $ 7,023  
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value $ 7,006  
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Rate 3.06%  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount $ 8,708  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value $ 8,715  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Weighted Average Rate 2.55%  
Held-to-maturity, Amortized Cost [1] $ 15,731 11,922
Held-to-maturity Securities, Fair Value [1] $ 15,721 $ 12,231
Held-to-maturity Securities, Debt Maturities, Weighted Average Rate 2.78%  
[1] * The carrying amount and amortized cost are the same for all held-to-maturity securities, as no OTTI has been recorded.