Allowance for Credit Losses (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		$ 6,007	$ 5,509	$ 5,229	$ 5,624
Allowance for Credit Loss, Excluding Accrued Interest		5,897		5,897
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		17		134
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		4		57
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		(97)		77
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		5,897		5,897
Charge-offs			(692)		(716)
Recoveries			32		157
Provision for loan losses			305		89
Allowance for loan losses - Ending Balance			5,154		5,154
Allowance for Credit Losses, Collectively Evaluated for Impairment		5,887		5,887		$ 4,918
Allowance for Credit Losses, Individually Evaluated for Impairment		10		10		311
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		624,651		624,651
Loans Receivable, Collectively Evaluated for Impairment		599,977		599,977		579,708
Loans Receivable, Individually Evaluated for Impairment		24,674		24,674		18,188
Loans and Leases Receivable, Net of Deferred Income		624,651		624,651		597,896
Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss, Excluding Accrued Interest		668		668
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		668		668
One-to-four family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		2,264	704	716	731
Allowance for Credit Loss, Excluding Accrued Interest		2,068		2,068
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		0		0
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		(196)		132
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		2,068		2,068
Charge-offs			0		0
Recoveries			0		90
Provision for loan losses			20		(97)
Allowance for loan losses - Ending Balance			724		724
Allowance for Credit Losses, Collectively Evaluated for Impairment		2,068		2,068		607
Allowance for Credit Losses, Individually Evaluated for Impairment		0		0		109
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		84,041		84,041
Loans Receivable, Collectively Evaluated for Impairment		80,772		80,772		60,805
Loans Receivable, Individually Evaluated for Impairment		3,269		3,269		5,003
Loans and Leases Receivable, Net of Deferred Income		84,041		84,041		65,808
One-to-four family | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss, Excluding Accrued Interest		1,220		1,220
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		1,220		1,220
Multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		721	1,055	1,109	1,114
Allowance for Credit Loss, Excluding Accrued Interest		722		722
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		0		0
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		1		5
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		722		722
Charge-offs			0		0
Recoveries			0		0
Provision for loan losses			25		(34)
Allowance for loan losses - Ending Balance			1,080		1,080
Allowance for Credit Losses, Collectively Evaluated for Impairment		722		722		1,109
Allowance for Credit Losses, Individually Evaluated for Impairment		0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		177,772		177,772
Loans Receivable, Collectively Evaluated for Impairment		175,179		175,179		179,046
Loans Receivable, Individually Evaluated for Impairment		2,593		2,593		71
Loans and Leases Receivable, Net of Deferred Income		177,772		177,772		179,117
Multifamily | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss, Excluding Accrued Interest		(392)		(392)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		(392)		(392)
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		1,212	1,608	1,814	1,157
Allowance for Credit Loss, Excluding Accrued Interest		1,211		1,211
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		0		0
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		(1)		(106)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		1,211		1,211
Charge-offs			(586)		(586)
Recoveries			0		10
Provision for loan losses			23		464
Allowance for loan losses - Ending Balance			1,045		1,045
Allowance for Credit Losses, Collectively Evaluated for Impairment		1,211		1,211		1,814
Allowance for Credit Losses, Individually Evaluated for Impairment		0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		174,202		174,202
Loans Receivable, Collectively Evaluated for Impairment		168,265		168,265		171,234
Loans Receivable, Individually Evaluated for Impairment		5,937		5,937		7,190
Loans and Leases Receivable, Net of Deferred Income		174,202		174,202		178,424
Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss, Excluding Accrued Interest		(497)		(497)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		(497)		(497)
Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		0		0
Allowance for Credit Loss, Excluding Accrued Interest		1		1
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		0		0
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		1		1
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		1		1
Allowance for Credit Losses, Collectively Evaluated for Impairment		1		1
Allowance for Credit Losses, Individually Evaluated for Impairment		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		1,559		1,559
Loans Receivable, Collectively Evaluated for Impairment		1,559		1,559
Loans Receivable, Individually Evaluated for Impairment		0		0
Loans and Leases Receivable, Net of Deferred Income		1,559		1,559		0
Construction | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss, Excluding Accrued Interest		0		0
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		0		0
Business
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		1,393	1,814	1,139	2,497
Allowance for Credit Loss, Excluding Accrued Interest		1,452		1,452
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		2		52
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		57		(244)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		1,452		1,452
Charge-offs			0		0
Recoveries			30		53
Provision for loan losses			69		(637)
Allowance for loan losses - Ending Balance			1,913		1,913
Allowance for Credit Losses, Collectively Evaluated for Impairment		1,442		1,442		937
Allowance for Credit Losses, Individually Evaluated for Impairment		10		10		202
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	[1]	172,204		172,204
Loans Receivable, Collectively Evaluated for Impairment		159,349		159,349		160,985
Loans Receivable, Individually Evaluated for Impairment		12,855		12,855		5,923
Loans and Leases Receivable, Net of Deferred Income		172,204		172,204		166,908	[1]
Business | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss, Excluding Accrued Interest		505		505
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		505		505
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		417	82	449	123
Allowance for Credit Loss, Excluding Accrued Interest		443		443
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		17		134
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		2		5
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		41		289
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		443		443
Charge-offs			(106)		(130)
Recoveries			2		4
Provision for loan losses			143		124
Allowance for loan losses - Ending Balance			121		121
Allowance for Credit Losses, Collectively Evaluated for Impairment		443		443		449
Allowance for Credit Losses, Individually Evaluated for Impairment		0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	[2]	14,873		14,873
Loans Receivable, Collectively Evaluated for Impairment		14,853		14,853		7,638
Loans Receivable, Individually Evaluated for Impairment		20		20		1
Loans and Leases Receivable, Net of Deferred Income		14,873		14,873		7,639	[2]
Consumer | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss, Excluding Accrued Interest		(166)		(166)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		(166)		(166)
Unallocated
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		0	246	2	2
Allowance for Credit Loss, Excluding Accrued Interest		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		0		0
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		0		0
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		0		0
Charge-offs			0		0
Recoveries			0		0
Provision for loan losses			25		269
Allowance for loan losses - Ending Balance			$ 271		$ 271
Allowance for Credit Losses, Collectively Evaluated for Impairment		0		0		2
Allowance for Credit Losses, Individually Evaluated for Impairment		0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		0		0
Loans Receivable, Collectively Evaluated for Impairment		0		0		0
Loans Receivable, Individually Evaluated for Impairment		0		0		0
Loans and Leases Receivable, Net of Deferred Income						$ 0
Unallocated | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss, Excluding Accrued Interest		(2)		(2)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		$ (2)		$ (2)

[1] (1) Includes PPP loans and business overdrafts

[2] 2) Includes personal loans and consumer overdrafts