Loans and Allowance for Credit Losses on Loans - Loan Balances by Internal Credit Quality Indicator (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2024
Commercial Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 9,051		$ 9,051		$ 12,761
Fiscal year before latest fiscal year	11,458		11,458		8,919
Two years before latest fiscal year	8,838		8,838		14,688
Three years before latest fiscal year	12,163		12,163		14,621
Four years before latest fiscal year	13,206		13,206		5,134
Prior	16,988		16,988		16,379
Revolving loans amortized cost basis	42,313		42,313		38,169
Revolving loans converted to term	304		304		636
Total	114,321		114,321		111,307
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			38		137
Revolving loans amortized cost basis			19		26
Revolving loans converted to term			0		0
Current period gross charge-offs	44	$ 143	57	$ 156	1,152
Residential Real Estate [Member] | Residential Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	31,481		31,481		55,070
Fiscal year before latest fiscal year	57,075		57,075		62,643
Two years before latest fiscal year	60,544		60,544		92,995
Three years before latest fiscal year	86,818		86,818		80,000
Four years before latest fiscal year	73,429		73,429		32,757
Prior	110,262		110,262		94,100
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		24
Total	419,609		419,609		417,589
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
Current period gross charge-offs	0	0	44	0	0
Residential Real Estate [Member] | Performing [Member] | Residential Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	31,481		31,481		55,070
Fiscal year before latest fiscal year	57,075		57,075		62,643
Two years before latest fiscal year	60,544		60,544		92,995
Three years before latest fiscal year	86,760		86,760		79,815
Four years before latest fiscal year	73,429		73,429		32,588
Prior	108,151		108,151		91,936
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		24
Total	417,440		417,440		415,071
Residential Real Estate [Member] | Non-performing [Member] | Residential Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
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	58		58		185
Four years before latest fiscal year					169
Prior	2,111		2,111		2,164
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Total	2,169		2,169		2,518
Real Estate Mortgage [Member] | Commercial Real Estate Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	164,656		164,656		103,866
Fiscal year before latest fiscal year	118,727		118,727		213,520
Two years before latest fiscal year	194,125		194,125		248,878
Three years before latest fiscal year	232,536		232,536		126,588
Four years before latest fiscal year	120,784		120,784		83,907
Prior	208,764		208,764		154,802
Revolving loans amortized cost basis	3,709		3,709		4,716
Revolving loans converted to term	5,271		5,271		363
Total	1,048,572		1,048,572		936,640
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
Current period gross charge-offs	0	0	5	0	0
Home Equity [Member] | Consumer Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,924		1,924		5,929
Fiscal year before latest fiscal year	4,998		4,998		2,888
Two years before latest fiscal year	2,501		2,501		336
Three years before latest fiscal year	269		269		429
Four years before latest fiscal year	350		350		266
Prior	872		872		1,128
Revolving loans amortized cost basis	21,371		21,371		18,190
Revolving loans converted to term	95		95		0
Total	32,380		32,380		29,166
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
Current period gross charge-offs	0	0	13	0	0
Home Equity [Member] | Performing [Member] | Consumer Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,924		1,924		5,929
Fiscal year before latest fiscal year	4,998		4,998		2,888
Two years before latest fiscal year	2,501		2,501		336
Three years before latest fiscal year	269		269		429
Four years before latest fiscal year	350		350		266
Prior	872		872		1,128
Revolving loans amortized cost basis	21,340		21,340		18,143
Revolving loans converted to term	95		95		0
Total	32,349		32,349		29,119
Home Equity [Member] | Non-performing [Member] | Consumer Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before latest fiscal year	0		0		0
Two years before latest fiscal year	0		0		0
Three years before latest fiscal year	0		0		0
Four years before latest fiscal year	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	31		31		47
Revolving loans converted to term	0		0		0
Total	31		31		47
Consumer Installment [Member] | Consumer Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,435		1,435		2,363
Fiscal year before latest fiscal year	1,514		1,514		1,217
Two years before latest fiscal year	824		824		689
Three years before latest fiscal year	422		422		277
Four years before latest fiscal year	173		173		83
Prior	60		60		65
Revolving loans amortized cost basis	68		68		77
Revolving loans converted to term	0		0		0
Total	4,496		4,496		4,771
Current fiscal year			242		393
Fiscal year before latest fiscal year			41		22
Two years before latest fiscal year			0		49
Three years before latest fiscal year			9		7
Four years before latest fiscal year			1		1
Prior			0		0
Revolving loans amortized cost basis			0		9
Revolving loans converted to term			0		0
Current period gross charge-offs	93	$ 117	293	$ 393	481
Consumer Installment [Member] | Performing [Member] | Consumer Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,435		1,435		2,363
Fiscal year before latest fiscal year	1,514		1,514		1,217
Two years before latest fiscal year	824		824		689
Three years before latest fiscal year	422		422		277
Four years before latest fiscal year	173		173		83
Prior	60		60		65
Revolving loans amortized cost basis	68		68		77
Revolving loans converted to term	0		0		0
Total	4,496		4,496		4,771
Consumer Installment [Member] | Non-performing [Member] | Consumer Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before latest fiscal year	0		0		0
Two years before latest fiscal year	0		0		0
Three years before latest fiscal year	0		0		0
Four years before latest fiscal year	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total	0		0		0
Pass [Member] | Commercial Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	9,051		9,051		12,761
Fiscal year before latest fiscal year	11,458		11,458		8,919
Two years before latest fiscal year	8,838		8,838		12,845
Three years before latest fiscal year	5,606		5,606		14,587
Four years before latest fiscal year	13,175		13,175		4,934
Prior	16,252		16,252		15,280
Revolving loans amortized cost basis	41,532		41,532		32,001
Revolving loans converted to term	116		116		636
Total	106,028		106,028		101,963
Pass [Member] | Real Estate Mortgage [Member] | Commercial Real Estate Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	164,656		164,656		103,537
Fiscal year before latest fiscal year	118,404		118,404		210,652
Two years before latest fiscal year	184,471		184,471		242,917
Three years before latest fiscal year	231,874		231,874		126,135
Four years before latest fiscal year	120,144		120,144		79,431
Prior	189,181		189,181		135,928
Revolving loans amortized cost basis	3,709		3,709		4,716
Revolving loans converted to term	5,060		5,060		363
Total	1,017,499		1,017,499		903,679
Special Mention [Member] | Commercial Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before latest fiscal year	0		0		0
Two years before latest fiscal year	0		0		78
Three years before latest fiscal year	59		59		0
Four years before latest fiscal year	0		0		35
Prior	119		119		834
Revolving loans amortized cost basis	145		145		3,893
Revolving loans converted to term	188		188		0
Total	511		511		4,840
Special Mention [Member] | Real Estate Mortgage [Member] | Commercial Real Estate Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before latest fiscal year	0		0		1,188
Two years before latest fiscal year	507		507		2,468
Three years before latest fiscal year	662		662		295
Four years before latest fiscal year	271		271		430
Prior	4,517		4,517		4,102
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total	5,957		5,957		8,483
Substandard [Member] | Commercial Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before latest fiscal year	0		0		0
Two years before latest fiscal year	0		0		1,765
Three years before latest fiscal year	6,498		6,498		34
Four years before latest fiscal year	31		31		165
Prior	617		617		265
Revolving loans amortized cost basis	636		636		2,275
Revolving loans converted to term	0		0		0
Total	7,782		7,782		4,504
Substandard [Member] | Real Estate Mortgage [Member] | Commercial Real Estate Portfolio [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		329
Fiscal year before latest fiscal year	323		323		1,680
Two years before latest fiscal year	9,147		9,147		3,493
Three years before latest fiscal year	0		0		158
Four years before latest fiscal year	369		369		4,046
Prior	15,066		15,066		14,772
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	211		211		0
Total	$ 25,116		$ 25,116		$ 24,478