Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Financial Assets
Available-for-sale Securities	$ 79,845	$ 60,709
Equity securities	454	0
Debt Securities, Held-to-maturity, Fair Value	11,107	11,909
Mortgage servicing rights	180	181
Fair Value, Inputs, Level 1
Financial Assets
Cash and cash equivalents	31,228	134,558
Available-for-sale Securities	0	0
Equity securities	0
FHLB Stock	0	0
Debt Securities, 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	277,360	245,634
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
Available-for-sale Securities	79,845	60,276
Equity securities	0
FHLB Stock	926	1,768
Debt Securities, Held-to-maturity, Fair Value	11,107	11,909
Loans receivable	0	0
Accrued interest receivable	2,019	2,023
Mortgage servicing rights	0	0
Other assets - Interest-bearing deposits	976	971
Financial Liabilities
Deposits	200,143	290,174
Advances from FHLB of New York	8,001	24,970
Other borrowed money	12,393	14,565
Accrued interest payable	1,931	1,086
Fair Value, Inputs, Level 3
Financial Assets
Cash and cash equivalents	0	0
Available-for-sale Securities	0	433
Equity securities	454
FHLB Stock	0	0
Debt Securities, Held-to-maturity, Fair Value	0	0
Loans receivable	424,013	469,382
Accrued interest receivable	0	0
Mortgage servicing rights	180	181
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	31,228	134,558
Available-for-sale Securities	79,845	60,709
FHLB Stock	926	1,768
Debt Securities, Held-to-maturity, Fair Value	11,137	12,075
Loans receivable	424,182	472,627
Accrued interest receivable	2,019	2,023
Mortgage servicing rights	180	181
Other assets - Interest-bearing deposits	976	971
Financial Liabilities
Deposits	480,196	586,883
Advances from FHLB of New York	8,000	25,000
Other borrowed money	13,403	13,403
Accrued interest payable	1,931	1,086
Estimate of Fair Value Measurement
Financial Assets
Cash and cash equivalents	31,228	134,558
Available-for-sale Securities	79,845	60,709
Equity securities	454
FHLB Stock	926	1,768
Debt Securities, Held-to-maturity, Fair Value	11,107	11,909
Loans receivable	424,013	469,382
Accrued interest receivable	2,019	2,023
Mortgage servicing rights	180	181
Other assets - Interest-bearing deposits	976	971
Financial Liabilities
Deposits	477,503	535,808
Advances from FHLB of New York	8,001	24,970
Other borrowed money	12,393	14,565
Accrued interest payable	$ 1,931	$ 1,086