Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Mar. 31, 2017
Financial Assets:
Held-to-maturity, Fair Value	[1]	$ 12,416	$ 13,497
Fair Value, Inputs, Level 1
Financial Assets:
Cash and cash equivalents		76,641	58,686
Restricted cash			0
Securities Available-for-Sale		0	0
FHLB Stock		0	0
Held-to-maturity, Fair Value		0	0
Loans Receivable		0	0
Loans held-for-sale			0
Accrued interest receivable		0	0
Mortgage servicing rights		0	0
Other assets - Interest-bearing deposits		0	0
Financial Liabilities:
Deposits		293,595	313,430
Advances from FHLB of New York		0	0
Other borrowed money		0	0
Accrued interest payable		0	0
Fair Value, Inputs, Level 2
Financial Assets:
Cash and cash equivalents		0	0
Restricted cash			283
Securities Available-for-Sale		54,696	58,608
FHLB Stock		1,768	2,171
Held-to-maturity, Fair Value		12,416	13,497
Loans Receivable		0	0
Loans held-for-sale			0
Accrued interest receivable		1,728	1,583
Mortgage servicing rights		0	0
Other assets - Interest-bearing deposits		970	985
Financial Liabilities:
Deposits		265,081	235,472
Advances from FHLB of New York		24,965	29,994
Other borrowed money		15,313	18,896
Accrued interest payable		920	390
Fair Value, Inputs, Level 3
Financial Assets:
Cash and cash equivalents		0	0
Restricted cash			0
Securities Available-for-Sale		391	403
FHLB Stock		0	0
Held-to-maturity, Fair Value		0	0
Loans Receivable		491,888	543,929
Loans held-for-sale			944
Accrued interest receivable		0	0
Mortgage servicing rights		183	192
Other assets - Interest-bearing deposits		0	0
Financial Liabilities:
Deposits		0	0
Advances from FHLB of New York		0	0
Other borrowed money		0	0
Accrued interest payable		0	0
Reported Value Measurement
Financial Assets:
Cash and cash equivalents		76,641	58,686
Restricted cash			283
Securities Available-for-Sale		55,087	59,011
FHLB Stock		1,768	2,171
Held-to-maturity, Fair Value		12,394	13,435
Loans Receivable		491,638	540,492
Loans held-for-sale			944
Accrued interest receivable		1,728	1,583
Other assets - Interest-bearing deposits		970	985
Financial Liabilities:
Deposits		560,721	579,176
Advances from FHLB of New York		25,000	30,000
Other borrowed money		13,403	19,403
Accrued interest payable		920	390
Estimate of Fair Value Measurement
Financial Assets:
Cash and cash equivalents		76,641	58,686
Restricted cash			283
Securities Available-for-Sale		55,087	59,011
FHLB Stock		1,768	2,171
Held-to-maturity, Fair Value		12,416	13,497
Loans Receivable		491,888	543,929
Loans held-for-sale			944
Accrued interest receivable		1,728	1,583
Mortgage servicing rights		183	192
Other assets - Interest-bearing deposits		970	985
Financial Liabilities:
Deposits		558,676	548,902
Advances from FHLB of New York		24,965	29,994
Other borrowed money		15,313	18,896
Accrued interest payable		$ 920	$ 390

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