Allowance for Credit Losses (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		$ 5,229	$ 5,624
Allowance for Credit Loss, Excluding Accrued Interest		5,858
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		95
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		50
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		6
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		5,858
Charge-offs			(13)
Recoveries			20
Provision for loan losses		6	(27)
Allowance for loan losses - Ending Balance			5,604
Allowance for Credit Losses, Collectively Evaluated for Impairment		5,745		$ 4,918
Allowance for Credit Losses, Individually Evaluated for Impairment		113		311
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		590,534
Loans Receivable, Collectively Evaluated for Impairment		567,640		579,708
Loans Receivable, Individually Evaluated for Impairment		22,894		18,188
Loans and Leases Receivable, Net of Deferred Income		590,534		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
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		668
One-to-four family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		716	731
Allowance for Credit Loss, Excluding Accrued Interest		2,063
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		0
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		127
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		2,063
Charge-offs			0
Recoveries			0
Provision for loan losses			(82)
Allowance for loan losses - Ending Balance			649
Allowance for Credit Losses, Collectively Evaluated for Impairment		1,962		607
Allowance for Credit Losses, Individually Evaluated for Impairment		101		109
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		65,526
Loans Receivable, Collectively Evaluated for Impairment		60,386		60,805
Loans Receivable, Individually Evaluated for Impairment		5,140		5,003
Loans and Leases Receivable, Net of Deferred Income		65,526		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
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		1,220
Multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		1,109	1,114
Allowance for Credit Loss, Excluding Accrued Interest		713
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		0
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		(4)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		713
Charge-offs			0
Recoveries			0
Provision for loan losses			(61)
Allowance for loan losses - Ending Balance			1,053
Allowance for Credit Losses, Collectively Evaluated for Impairment		713		1,109
Allowance for Credit Losses, Individually Evaluated for Impairment		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		178,815
Loans Receivable, Collectively Evaluated for Impairment		176,508		179,046
Loans Receivable, Individually Evaluated for Impairment		2,307		71
Loans and Leases Receivable, Net of Deferred Income		178,815		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)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		(392)
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		1,814	1,157
Allowance for Credit Loss, Excluding Accrued Interest		1,264
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		0
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		(53)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		1,264
Charge-offs			0
Recoveries			0
Provision for loan losses			(49)
Allowance for loan losses - Ending Balance			1,108
Allowance for Credit Losses, Collectively Evaluated for Impairment		1,264		1,814
Allowance for Credit Losses, Individually Evaluated for Impairment		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		173,088
Loans Receivable, Collectively Evaluated for Impairment		168,566		171,234
Loans Receivable, Individually Evaluated for Impairment		4,522		7,190
Loans and Leases Receivable, Net of Deferred Income		173,088		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)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		(497)
Business
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		1,139	2,497
Allowance for Credit Loss, Excluding Accrued Interest		1,404
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		49
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		(289)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		1,404
Charge-offs			0
Recoveries			19
Provision for loan losses			(195)
Allowance for loan losses - Ending Balance			2,321
Allowance for Credit Losses, Collectively Evaluated for Impairment		1,392		937
Allowance for Credit Losses, Individually Evaluated for Impairment		12		202
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	[1]	163,348
Loans Receivable, Collectively Evaluated for Impairment		152,424		160,985
Loans Receivable, Individually Evaluated for Impairment		10,924		5,923
Loans and Leases Receivable, Net of Deferred Income		163,348		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
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		505
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		449	123
Allowance for Credit Loss, Excluding Accrued Interest		414
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		95
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		1
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		225
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		414
Charge-offs			(13)
Recoveries			1
Provision for loan losses			2
Allowance for loan losses - Ending Balance			113
Allowance for Credit Losses, Collectively Evaluated for Impairment		414		449
Allowance for Credit Losses, Individually Evaluated for Impairment		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	[2]	9,757
Loans Receivable, Collectively Evaluated for Impairment		9,756		7,638
Loans Receivable, Individually Evaluated for Impairment		1		1
Loans and Leases Receivable, Net of Deferred Income		9,757		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)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		(166)
Unallocated
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses - Beginning Balance		2	2
Allowance for Credit Loss, Excluding Accrued Interest		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery		0
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)		0
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		0
Charge-offs			0
Recoveries			0
Provision for loan losses			358
Allowance for loan losses - Ending Balance			$ 360
Allowance for Credit Losses, Collectively Evaluated for Impairment		0		2
Allowance for Credit Losses, Individually Evaluated for Impairment		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		0
Loans Receivable, Collectively Evaluated for Impairment		0		0
Loans Receivable, Individually Evaluated for Impairment		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)
Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance		$ (2)

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

[2] 2) Includes personal loans and consumer overdrafts