Loans Held for Investment - Schedule of Past Due Status of Loans Held for Investment, Gross (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans deemed uncollectible, period of delinquency	90 days	90 days
Current	$ 848,652	$ 842,668
30-89 Days Past Due	3	7
Non-Accrual	3,368	9,407
Total Loans Held for Investment, Gross	852,023	852,082	$ 857,080
Mortgage loans, Single-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	288,421	259,984
30-89 Days Past Due	0	0
Non-Accrual	1,824	8,288
Total Loans Held for Investment, Gross	290,245	268,272	257,864
Mortgage Loans, Multi Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	464,923	483,289
30-89 Days Past Due	0	0
Non-Accrual	1,544	1,119
Total Loans Held for Investment, Gross	466,467	484,408	488,412
Mortgage loans, Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	91,236	95,279
30-89 Days Past Due	0	0
Non-Accrual	0	0
Total Loans Held for Investment, Gross	91,236	95,279	102,551
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,501	3,040
30-89 Days Past Due	0	0
Non-Accrual	0	0
Total Loans Held for Investment, Gross	3,501	3,040	7,135
Mortgage Loans Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	134	139
30-89 Days Past Due	0	0
Non-Accrual	0	0
Total Loans Held for Investment, Gross	134	139	141
Commercial business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	362	849
30-89 Days Past Due	0	0
Non-Accrual	0	0
Total Loans Held for Investment, Gross	362	849	882
Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	75	88
30-89 Days Past Due	3	7
Non-Accrual	0	0
Total Loans Held for Investment, Gross	$ 78	$ 95	$ 95
Bankruptcy [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans deemed uncollectible, period of delinquency	60 days
Troubled Debt Restructurings [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans deemed uncollectible, period of delinquency	90 days
Commercial Real Estate Or Second Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans deemed uncollectible, period of delinquency	120 days