Loans Receivable - Summary of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jul. 01, 2023	Jun. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 695,498		$ 361,423
Allowance for credit losses	(5,325)	$ (1,163)	(1,116)
Deferred loan costs, net	2,230		1,945
Loans receivable, net	692,403		362,252
Owner Occupied Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	60,850		144
Non-Owner Occupied Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	75,357		296
Multi-Family Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	171,427		10
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	12,789
Total Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	320,423		450
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	362,704		353,624
Consumer and Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 12,371		$ 7,349