Benefit Plans - Narrative (Details) $ / shares in Units, $ in Thousands					3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 15, 2025 USD ($) installment $ / shares shares	Apr. 01, 2021 USD ($) $ / shares shares	Oct. 01, 2020 USD ($) $ / shares shares	Jul. 01, 2020 $ / shares shares	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($)	Dec. 31, 2024 $ / shares shares	Jun. 30, 2021 installment	Sep. 15, 2020 shares
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, employer matching contribution, percent of employees' gross pay					50.00%
Defined contribution plan, employer matching contribution, percent of match					6.00%
Defined contribution plan, administrative expense					$ 61	$ 76	$ 192	$ 214
Shares acquired by ESOP (in shares) | shares				1,082,130	1,082,130		1,082,130		1,082,130
Quoted per share price (in USD per share) | $ / shares				$ 13.59			$ 14.21		$ 14.15
Unearned ESOP shares (in shares) | shares					748,456		748,456		789,035
Granted (in shares) | shares							55,467
Grant date fair value (in USD per share) | $ / shares							$ 13.37
Restricted Stock
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Grant date fair value (in USD per share) | $ / shares							$ 13.37
2020 Equity Incentive Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Granted (in shares) | shares	55,467	8,000	1,095,657
Grant date fair value (in USD per share) | $ / shares	$ 13.37	$ 13.86	$ 10.53
2020 Equity Incentive Plan | Stock option
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Common shares authorized (in shares) | shares											1,352,662
Stock options vesting installments | installment	5									5
Share-based payment arrangement, expense					$ 7		$ 300
Tax benefit recognized					0		31
Unrecognized compensation expense					154		154
2020 Equity Incentive Plan | Restricted Stock
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Common shares authorized (in shares) | shares											541,065
Common shares awarded (in shares) | shares	37,126	4,000	449,086
Grant date fair value (in USD per share) | $ / shares	$ 13.37	$ 13.86	$ 10.53
Total market value	$ 496	$ 55	$ 4,700
Stock options vesting installments | installment	5									5
Share-based payment arrangement, expense					22		456
Tax benefit recognized					5		96
Unrecognized compensation expense					$ 474		$ 474