Allowance for Credit Losses (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		$ 5,858	$ 5,604	$ 5,229	$ 5,624
Allowance for Credit Loss, Excluding Accrued Interest		6,007		6,007
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		22		117
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		3		53
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		168		174
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		6,007		6,007
Charge-offs			(11)		(24)
Recoveries			105		125
Provision for loan losses			(189)		(216)
Allowance for loan losses - Ending Balance			5,509		5,509
Allowance for Credit Losses, Collectively Evaluated for Impairment		5,974		5,974		$ 4,918
Allowance for Credit Losses, Individually Evaluated for Impairment		33		33		311
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		611,102		611,102
Loans Receivable, Collectively Evaluated for Impairment		593,533		593,533		579,708
Loans Receivable, Individually Evaluated for Impairment		17,569		17,569		18,188
Loans and Leases Receivable, Net of Deferred Income		611,102		611,102		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		2,063	649	716	731
Allowance for Credit Loss, Excluding Accrued Interest		2,264		2,264
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)		201		328
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		2,264		2,264
Charge-offs			0		0
Recoveries			90		90
Provision for loan losses			(35)		(117)
Allowance for loan losses - Ending Balance			704		704
Allowance for Credit Losses, Collectively Evaluated for Impairment		2,241		2,241		607
Allowance for Credit Losses, Individually Evaluated for Impairment		23		23		109
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		85,081		85,081
Loans Receivable, Collectively Evaluated for Impairment		80,791		80,791		60,805
Loans Receivable, Individually Evaluated for Impairment		4,290		4,290		5,003
Loans and Leases Receivable, Net of Deferred Income		85,081		85,081		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		713	1,053	1,109	1,114
Allowance for Credit Loss, Excluding Accrued Interest		721		721
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)		8		4
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		721		721
Charge-offs			0		0
Recoveries			0		0
Provision for loan losses			2		(59)
Allowance for loan losses - Ending Balance			1,055		1,055
Allowance for Credit Losses, Collectively Evaluated for Impairment		721		721		1,109
Allowance for Credit Losses, Individually Evaluated for Impairment		0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		179,039		179,039
Loans Receivable, Collectively Evaluated for Impairment		176,439		176,439		179,046
Loans Receivable, Individually Evaluated for Impairment		2,600		2,600		71
Loans and Leases Receivable, Net of Deferred Income		179,039		179,039		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		1,264	1,108	1,814	1,157
Allowance for Credit Loss, Excluding Accrued Interest		1,212		1,212
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)		(52)		(105)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		1,212		1,212
Charge-offs			0		0
Recoveries			10		10
Provision for loan losses			490		441
Allowance for loan losses - Ending Balance			1,608		1,608
Allowance for Credit Losses, Collectively Evaluated for Impairment		1,212		1,212		1,814
Allowance for Credit Losses, Individually Evaluated for Impairment		0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		171,112		171,112
Loans Receivable, Collectively Evaluated for Impairment		166,590		166,590		171,234
Loans Receivable, Individually Evaluated for Impairment		4,522		4,522		7,190
Loans and Leases Receivable, Net of Deferred Income		171,112		171,112		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]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		491		491
Loans Receivable, Collectively Evaluated for Impairment		491		491
Loans Receivable, Individually Evaluated for Impairment		0		0
Business
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		1,404	2,321	1,139	2,497
Allowance for Credit Loss, Excluding Accrued Interest		1,393		1,393
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		1		50
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		(12)		(301)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		1,393		1,393
Charge-offs			0		0
Recoveries			4		23
Provision for loan losses			(511)		(706)
Allowance for loan losses - Ending Balance			1,814		1,814
Allowance for Credit Losses, Collectively Evaluated for Impairment		1,383		1,383		937
Allowance for Credit Losses, Individually Evaluated for Impairment		10		10		202
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	[1]	162,460		162,460
Loans Receivable, Collectively Evaluated for Impairment		156,307		156,307		160,985
Loans Receivable, Individually Evaluated for Impairment		6,153		6,153		5,923
Loans and Leases Receivable, Net of Deferred Income		162,460		162,460		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		414	113	449	123
Allowance for Credit Loss, Excluding Accrued Interest		417		417
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		22		117
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		2		3
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		23		248
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		417		417
Charge-offs			(11)		(24)
Recoveries			1		2
Provision for loan losses			(21)		(19)
Allowance for loan losses - Ending Balance			82		82
Allowance for Credit Losses, Collectively Evaluated for Impairment		417		417		449
Allowance for Credit Losses, Individually Evaluated for Impairment		0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	[2]	12,919		12,919
Loans Receivable, Collectively Evaluated for Impairment		12,915		12,915		7,638
Loans Receivable, Individually Evaluated for Impairment		4		4		1
Loans and Leases Receivable, Net of Deferred Income		12,919		12,919		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	360	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			(114)		244
Allowance for loan losses - Ending Balance			$ 246		$ 246
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