Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Financial Assets:
Held-to-maturity, Fair Value	$ 10,879	$ 11,107
Fair Value, Inputs, Level 1
Financial Assets:
Cash and cash equivalents	38,229	31,228
Securities Available-for-Sale	0	0
Other investments	0	0
FHLB Stock	0	0
Held-to-maturity, Fair Value	0	0
Loans Receivable	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	0	0
Other assets - Interest-bearing deposits	0	0
Financial Liabilities:
Deposits	280,017	277,360
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
Securities Available-for-Sale	75,109	79,845
Other investments	0	0
FHLB Stock	1,468	926
Held-to-maturity, Fair Value	10,879	11,107
Loans Receivable	0	0
Accrued interest receivable	2,065	2,019
Mortgage servicing rights	0	0
Other assets - Interest-bearing deposits	978	976
Financial Liabilities:
Deposits	192,097	200,143
Advances from FHLB of New York	19,998	8,001
Other borrowed money	13,370	12,393
Accrued interest payable	2,403	1,931
Fair Value, Inputs, Level 3
Financial Assets:
Cash and cash equivalents	0	0
Securities Available-for-Sale	0	0
Other investments	492	454
FHLB Stock	0	0
Held-to-maturity, Fair Value	0	0
Loans Receivable	434,711	424,013
Accrued interest receivable	0	0
Mortgage servicing rights	174	180
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	38,229	31,228
Securities Available-for-Sale	75,109	79,845
Other investments	492	454
FHLB Stock	1,468	926
Held-to-maturity, Fair Value	10,680	11,137
Loans Receivable	428,659	424,182
Accrued interest receivable	2,065	2,019
Mortgage servicing rights	174	180
Other assets - Interest-bearing deposits	978	976
Financial Liabilities:
Deposits	473,121	480,196
Advances from FHLB of New York	20,000	8,000
Other borrowed money	13,403	13,403
Accrued interest payable	2,403	1,931
Estimate of Fair Value Measurement
Financial Assets:
Cash and cash equivalents	38,229	31,228
Securities Available-for-Sale	75,109	79,845
Other investments	492	454
FHLB Stock	1,468	926
Held-to-maturity, Fair Value	10,879	11,107
Loans Receivable	434,711	424,013
Accrued interest receivable	2,065	2,019
Mortgage servicing rights	174	180
Other assets - Interest-bearing deposits	978	976
Financial Liabilities:
Deposits	472,114	477,503
Advances from FHLB of New York	19,998	8,001
Other borrowed money	13,370	12,393
Accrued interest payable	$ 2,403	$ 1,931