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Benefit Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
ESOP, number of shares purchased (in shares) | 6,022,000 | 6,022,000 |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
ESOP compensation expense | $ 1,900 | $ 2,500 | $ 2,100
Maximum employee contribution percentage | 75.00% |  |
Maximum employer matching contribution percentage | 3.50% |  |
Eligible employee contribution | 6.00% |  |
Plan expense amount | $ 1,400 | $ 1,400 | $ 1,300
Multiemployer Plans, Postretirement Benefit |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Multiemployer plan number | 001 |  |
Funded status |  | 103.17% | 113.78%
Total contributions |  | $ 142,400 | $ 248,600
Total expense recorded | $ 180 | 372 | 329
Multiemployer Plans, Postretirement Benefit | Maximum |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Percentage of contributions compared to total contributions | 5.00% |  |
Benefit Equalization Plan ("BEP") |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
ESOP compensation expense | $ 17 | 40 | 37
ESOP liability | 16 | 20 |
Unrecognized net gain (loss) included in accumulated other comprehensive income | (626) | (707) |
Benefit payments | 244 | 241 | 239
Contributions | 244 | 241 | 239
Defined benefit plan, expected future benefit payments, next twelve months | 241 |  |
Atlas Bank Retirement Income Plan ("ABRIP") |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Unrecognized net gain (loss) included in accumulated other comprehensive income | (475) | (475) |
Benefit payments | 148 | 148 |
Defined benefit plan, expected future benefit payments, next twelve months | 146 |  |
Postretirement Welfare Plan |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Unrecognized net gain (loss) included in accumulated other comprehensive income | 529 | 377 |
Benefit payments | 13 | 12 | 12
Contributions | 13 | 12 | 12
Defined benefit plan, expected future benefit payments, next twelve months | 54 |  |
Directors' Consultation and Retirement Plan ("DCRP") |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Unrecognized net gain (loss) included in accumulated other comprehensive income | 840 | 716 |
Benefit payments | 49 | 49 |
Contributions | 49 | $ 49 | $ 69
Defined benefit plan, expected future benefit payments, next twelve months | $ 72 |  |
Second Step Conversion and Stock Offering |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
ESOP, number of shares purchased (in shares) | 2,409,764 |  |
Additional shares in ESOP (in shares) | 3,612,500 |  |
Common stock, par value (in dollars per share) | $ 10.00 |  |
Amount of outstanding principal and interest refinanced | $ 3,800 |  |
Employer additional loan to ESOP | 36,100 |  |
ESOP outstanding loan principal amount | $ 26,400 |  |

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- Definition Employee stock ownership plan ESOP outstanding loan principal. + References No definition available. + Details
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- Definition Multiemployer plans plan contribution percent. + References No definition available. + Details
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- Definition Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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