Loans Held for Investment - Schedule of Restructured Loan Balances, Net of Allowance for Loan Losses, by Loan type and by Nonaccrual Versus Accrual Status (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022
Financing Receivable, Modifications [Line Items]
Restructured loans on non-accrual status	$ 721	$ 722
Restructured loans on accrual status	1,906	3,748
Total restructured loans	2,627	4,470
Mortgage loans, Single-family
Financing Receivable, Modifications [Line Items]
Restructured loans on non-accrual status	721	722
Restructured loans on accrual status	$ 1,906	$ 3,748