Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Mar. 31, 2020
Financial Assets:
Held-to-maturity, Fair Value	$ 9,551	$ 10,564
Fair Value, Inputs, Level 1
Financial Assets:
Cash and cash equivalents	79,551	47,540
Securities Available-for-Sale	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
Financial Liabilities:
Deposits	380,212	291,951
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	100,181	65,829
Held-to-maturity, Fair Value	9,551	10,564
Loans Receivable	0	0
Accrued interest receivable	2,910	2,052
Mortgage servicing rights	0	0
Other assets - Interest-bearing deposits		981
Financial Liabilities:
Deposits	188,947	197,358
Other borrowed money	41,705	13,386
Accrued interest payable	3,050	2,695
Fair Value, Inputs, Level 3
Financial Assets:
Cash and cash equivalents	0	0
Securities Available-for-Sale	0	0
Held-to-maturity, Fair Value	0	0
Loans Receivable	478,144	438,017
Accrued interest receivable	0	0
Mortgage servicing rights	142	145
Other assets - Interest-bearing deposits		0
Financial Liabilities:
Deposits	0	0
Other borrowed money	0	0
Accrued interest payable	0	0
Reported Value Measurement
Financial Assets:
Cash and cash equivalents	79,551	47,540
Securities Available-for-Sale	100,181	65,829
Held-to-maturity, Fair Value	9,164	10,151
Loans Receivable	463,455	423,786
Accrued interest receivable	2,910	2,052
Mortgage servicing rights	142	145
Other assets - Interest-bearing deposits		981
Financial Liabilities:
Deposits	569,742	488,815
Other borrowed money	41,633	13,403
Accrued interest payable	3,050	2,695
Estimate of Fair Value Measurement
Financial Assets:
Cash and cash equivalents	79,551	47,540
Securities Available-for-Sale	100,181	65,829
Held-to-maturity, Fair Value	9,551	10,564
Loans Receivable	478,144	438,017
Accrued interest receivable	2,910	2,052
Mortgage servicing rights	142	145
Other assets - Interest-bearing deposits		981
Financial Liabilities:
Deposits	569,159	489,309
Other borrowed money	41,705	13,386
Accrued interest payable	$ 3,050	$ 2,695