Investment Securities Investment Securities-Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Mar. 31, 2017
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis		$ 5,060
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis		14,206
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis		40,405
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis		59,671
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value		4,996
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value		13,914
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value		39,197
Available-for-sale		$ 58,107	$ 59,011
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Weighted Average Rate		1.66%
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Rate		2.00%
Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Rate		1.51%
Available-for-sale Securities, Debt Maturities, Weighted Average Rate		1.64%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount		$ 6,480
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount		6,614
Held-to-maturity	[1]	13,094	13,435
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value		6,576
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value		6,645
Held-to-maturity, Fair Value	[1]	$ 13,221	$ 13,497
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Rate		3.04%
Held-to-maturity Securities, Debt Maturities, after Ten Years, Weighted Average Rate		2.47%
Held-to-maturity Securities, Debt Maturities, Weighted Average Rate		2.75%

[1] * The carrying amount and amortized cost are the same for all held-to-maturity securities, as no OTTI has been recorded.