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Investment Securities Investment Securities Text Tags (Details)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Schedule of Investments [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 31 33
Available-for-sale $ 58,107,000 $ 59,011,000
Percentage Available-for-sale Securities 81.60%  
Held-to-maturity [1] $ 13,094,000 13,435,000
Percentage Held-to-maturity Securities 18.40%  
Trading Securities $ 0  
Mortgage-backed securities    
Schedule of Investments [Line Items]    
Number of AFS securities in Unrealized Loss Positions, greater than or equal to 12 months 1  
Percentage Available-for-Sale, Continuos Unrealized Loss Position 61.80%  
Available-for-sale $ 35,717,000 36,703,000
Other investments    
Schedule of Investments [Line Items]    
Number of AFS securities in Unrealized Loss Positions, greater than or equal to 12 months 1  
Available-for-sale $ 9,916,000 [2] 9,862,000 [3]
Corporate Bonds    
Schedule of Investments [Line Items]    
Number of AFS securities in Unrealized Loss Positions, Less than One Year 5  
Available-for-sale $ 4,990,000 $ 4,964,000
[1] * The carrying amount and amortized cost are the same for all held-to-maturity securities, as no OTTI has been recorded.
[2] (1) Primarily comprised of an investment in a CRA fund with 95% of its underlying investments consisting of government and agency-backed securities.
[3] (1) Primarily comprised of an investment in a CRA fund with 95% of its underlying investments consisting of government and agency-backed securities.