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Investment Securities: Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Mar. 31, 2015
 [2]
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis $ 18,982  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value 18,888  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 13,999  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value 13,964  
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount 68  
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value 69  
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis 121,646  
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 121,440  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount 9  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value 10  
Available-for-sale Debt Securities, Amortized Cost Basis 154,627  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 154,292  
Investment securities held to maturity, at amortized cost 77 [1] $ 86
Investments    
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 79  
[1] Fair value of $79.
[2] Fair value of $88.