Loans and Allowance for Credit Losses on Loans, Loans Balances by Internal Credit Quality Indicator (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024
Credit Quality by Loan Class by Vintage [Abstract]
Total	[1],[2]	$ 1,501,212		$ 1,499,473
Current-Period Gross Charge-Offs [Abstract]
Total		145	$ 129
Unfunded Commitments [Member]
Current-Period Gross Charge-Offs [Abstract]
Allowance for credit losses		1,600		1,300
Doubtful [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Total		0
Loss [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Total				0
Residential Portfolio [Member] | Residential Real Estate [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		7,821		55,070
Fiscal year before latest fiscal year		54,991		62,643
Two years before latest fiscal year		62,158		92,995
Three years before latest fiscal year		90,337		80,000
Four years before latest fiscal year		77,189		32,757
Prior		121,314		94,100
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		24
Total		413,810		417,589
Current-Period Gross Charge-Offs [Abstract]
Current fiscal year		0		0
Fiscal year before latest fiscal year		0		0
Two years before latest fiscal year		0		0
Three years before latest fiscal year		0		0
Four years before latest fiscal year		44		0
Prior		0		0
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Total		44	0	0
Residential Portfolio [Member] | Residential Real Estate [Member] | Performing [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		7,821		55,070
Fiscal year before latest fiscal year		54,991		62,643
Two years before latest fiscal year		62,158		92,995
Three years before latest fiscal year		90,275		79,815
Four years before latest fiscal year		77,189		32,588
Prior		119,100		91,936
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		24
Total		411,534		415,071
Residential Portfolio [Member] | Residential Real Estate [Member] | Non-performing [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		0		0
Fiscal year before latest fiscal year		0		0
Two years before latest fiscal year		0		0
Three years before latest fiscal year		62		185
Four years before latest fiscal year		0		169
Prior		2,214		2,164
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Total		2,276		2,518
Commercial Real Estate Portfolio [Member] | Real Estate Mortgage [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		17,506		103,866
Fiscal year before latest fiscal year		109,605		213,520
Two years before latest fiscal year		214,817		248,878
Three years before latest fiscal year		247,414		126,588
Four years before latest fiscal year		125,106		83,907
Prior		230,590		154,802
Revolving loans amortized cost basis		4,625		4,716
Revolving loans converted to term		2,265		363
Total		951,928		936,640
Current-Period Gross Charge-Offs [Abstract]
Current fiscal year		0		0
Fiscal year before latest fiscal year		0		0
Two years before latest fiscal year		0		0
Three years before latest fiscal year		0		0
Four years before latest fiscal year		0		0
Prior		5		0
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Total		5	0	0
Commercial Real Estate Portfolio [Member] | Real Estate Mortgage [Member] | Pass [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		17,506		103,537
Fiscal year before latest fiscal year		109,278		210,652
Two years before latest fiscal year		204,488		242,917
Three years before latest fiscal year		241,493		126,135
Four years before latest fiscal year		124,624		79,431
Prior		207,190		135,928
Revolving loans amortized cost basis		4,625		4,716
Revolving loans converted to term		2,265		363
Total		911,469		903,679
Commercial Real Estate Portfolio [Member] | Real Estate Mortgage [Member] | Special Mention [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		0		0
Fiscal year before latest fiscal year		0		1,188
Two years before latest fiscal year		8,318		2,468
Three years before latest fiscal year		2,446		295
Four years before latest fiscal year		287		430
Prior		4,832		4,102
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Total		15,883		8,483
Commercial Real Estate Portfolio [Member] | Real Estate Mortgage [Member] | Substandard [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		0		329
Fiscal year before latest fiscal year		327		1,680
Two years before latest fiscal year		2,011		3,493
Three years before latest fiscal year		3,475		158
Four years before latest fiscal year		195		4,046
Prior		18,568		14,772
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Total		24,576		24,478
Consumer Portfolio [Member] | Home Equity [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		777		5,929
Fiscal year before latest fiscal year		5,649		2,888
Two years before latest fiscal year		2,774		336
Three years before latest fiscal year		321		429
Four years before latest fiscal year		401		266
Prior		1,233		1,128
Revolving loans amortized cost basis		19,699		18,190
Revolving loans converted to term		0		0
Total		30,854		29,166
Current-Period Gross Charge-Offs [Abstract]
Current fiscal year		0		0
Fiscal year before latest fiscal year		0		0
Two years before latest fiscal year		0		0
Three years before latest fiscal year		0		0
Four years before latest fiscal year		0		0
Prior		0		0
Revolving loans amortized cost basis		13		0
Revolving loans converted to term		0		0
Total		13	0	0
Consumer Portfolio [Member] | Home Equity [Member] | Performing [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		777		5,929
Fiscal year before latest fiscal year		5,649		2,888
Two years before latest fiscal year		2,774		336
Three years before latest fiscal year		321		429
Four years before latest fiscal year		401		266
Prior		1,230		1,128
Revolving loans amortized cost basis		19,666		18,143
Revolving loans converted to term		0		0
Total		30,818		29,119
Consumer Portfolio [Member] | Home Equity [Member] | Non-performing [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		0		0
Fiscal year before latest fiscal year		0		0
Two years before latest fiscal year		0		0
Three years before latest fiscal year		0		0
Four years before latest fiscal year		0		0
Prior		3		0
Revolving loans amortized cost basis		33		47
Revolving loans converted to term		0		0
Total		36		47
Consumer Portfolio [Member] | Consumer Installment [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		829		2,363
Fiscal year before latest fiscal year		1,884		1,217
Two years before latest fiscal year		1,087		689
Three years before latest fiscal year		613		277
Four years before latest fiscal year		244		83
Prior		102		65
Revolving loans amortized cost basis		77		77
Revolving loans converted to term		0		0
Total		4,836		4,771
Current-Period Gross Charge-Offs [Abstract]
Current fiscal year		71		393
Fiscal year before latest fiscal year		6		22
Two years before latest fiscal year		0		49
Three years before latest fiscal year		0		7
Four years before latest fiscal year		0		1
Prior		0		0
Revolving loans amortized cost basis		0		9
Revolving loans converted to term		0		0
Total		77	122	481
Consumer Portfolio [Member] | Consumer Installment [Member] | Performing [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		829		2,363
Fiscal year before latest fiscal year		1,884		1,217
Two years before latest fiscal year		1,087		689
Three years before latest fiscal year		613		277
Four years before latest fiscal year		244		83
Prior		102		65
Revolving loans amortized cost basis		77		77
Revolving loans converted to term		0		0
Total		4,836		4,771
Consumer Portfolio [Member] | Consumer Installment [Member] | Non-performing [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		0		0
Fiscal year before latest fiscal year		0		0
Two years before latest fiscal year		0		0
Three years before latest fiscal year		0		0
Four years before latest fiscal year		0		0
Prior		0		0
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Total		0		0
Commercial Portfolio [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		1,432		12,761
Fiscal year before latest fiscal year		12,495		8,919
Two years before latest fiscal year		8,911		14,688
Three years before latest fiscal year		13,882		14,621
Four years before latest fiscal year		14,203		5,134
Prior		19,371		16,379
Revolving loans amortized cost basis		29,292		38,169
Revolving loans converted to term		198		636
Total		99,784		111,307
Current-Period Gross Charge-Offs [Abstract]
Current fiscal year		0		0
Fiscal year before latest fiscal year		0		0
Two years before latest fiscal year		0		0
Three years before latest fiscal year		0		989
Four years before latest fiscal year		0		0
Prior		0		137
Revolving loans amortized cost basis		6		26
Revolving loans converted to term		0		0
Total		6	$ 7	1,152
Commercial Portfolio [Member] | Pass [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		1,432		12,761
Fiscal year before latest fiscal year		12,495		8,919
Two years before latest fiscal year		8,911		12,845
Three years before latest fiscal year		6,394		14,587
Four years before latest fiscal year		14,170		4,934
Prior		18,004		15,280
Revolving loans amortized cost basis		25,836		32,001
Revolving loans converted to term		198		636
Total		87,440		101,963
Commercial Portfolio [Member] | Special Mention [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		0		0
Fiscal year before latest fiscal year		0		0
Two years before latest fiscal year		0		78
Three years before latest fiscal year		5,762		0
Four years before latest fiscal year		0		35
Prior		614		834
Revolving loans amortized cost basis		1,733		3,893
Revolving loans converted to term		0		0
Total		8,109		4,840
Commercial Portfolio [Member] | Substandard [Member]
Credit Quality by Loan Class by Vintage [Abstract]
Current fiscal year		0		0
Fiscal year before latest fiscal year		0		0
Two years before latest fiscal year		0		1,765
Three years before latest fiscal year		1,726		34
Four years before latest fiscal year		33		165
Prior		753		265
Revolving loans amortized cost basis		1,723		2,275
Revolving loans converted to term		0		0
Total		$ 4,235		$ 4,504

[1] Loan balances exclude accrued interest receivable of $6.5 million and $6.2 million at September 30, 2024 and June 30, 2024, respectively, which is included in accrued interest receivable in the consolidated statement of financial condition.

[2] Loan balances include net deferred fees/costs of ($181,000) and ($42,000) at September 30, 2024 and June 30, 2024, respectively.