Loans Held for Investment - Schedule of Loans Held for Investment Contractually Repricing (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Fixed Rate	$ 43,995
Total loans held for investment, gross	859,959	$ 852,082
Mortgage loans, Single-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Fixed Rate	42,977
Total loans held for investment, gross	274,970	268,272
Mortgage Loans, Multi Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Fixed Rate	208
Total loans held for investment, gross	489,550	484,408
Mortgage loans, Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Fixed Rate	0
Total loans held for investment, gross	91,779	95,279
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Fixed Rate	327
Total loans held for investment, gross	2,574	3,040
Mortgage Loans Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Fixed Rate	137
Total loans held for investment, gross	137	139
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Fixed Rate	346
Total loans held for investment, gross	865	849
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Fixed Rate	0
Total loans held for investment, gross	84	$ 95
Within One Year [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	268,554
Within One Year [Member] | Mortgage loans, Single-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	56,142
Within One Year [Member] | Mortgage Loans, Multi Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	164,115
Within One Year [Member] | Mortgage loans, Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	45,447
Within One Year [Member] | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	2,247
Within One Year [Member] | Mortgage Loans Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	0
Within One Year [Member] | Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	519
Within One Year [Member] | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	84
After One Year Through 3 Years [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	198,602
After One Year Through 3 Years [Member] | Mortgage loans, Single-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	41,341
After One Year Through 3 Years [Member] | Mortgage Loans, Multi Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	128,288
After One Year Through 3 Years [Member] | Mortgage loans, Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	28,973
After One Year Through 3 Years [Member] | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	0
After One Year Through 3 Years [Member] | Mortgage Loans Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	0
After One Year Through 3 Years [Member] | Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	0
After One Year Through 3 Years [Member] | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	0
After 3 Years Through 5 Years [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	219,927
After 3 Years Through 5 Years [Member] | Mortgage loans, Single-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	36,261
After 3 Years Through 5 Years [Member] | Mortgage Loans, Multi Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	166,307
After 3 Years Through 5 Years [Member] | Mortgage loans, Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	17,359
After 3 Years Through 5 Years [Member] | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	0
After 3 Years Through 5 Years [Member] | Mortgage Loans Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	0
After 3 Years Through 5 Years [Member] | Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	0
After 3 Years Through 5 Years [Member] | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	0
After 5 Years Through 10 Years [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	128,881
After 5 Years Through 10 Years [Member] | Mortgage loans, Single-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	98,249
After 5 Years Through 10 Years [Member] | Mortgage Loans, Multi Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	30,632
After 5 Years Through 10 Years [Member] | Mortgage loans, Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	0
After 5 Years Through 10 Years [Member] | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	0
After 5 Years Through 10 Years [Member] | Mortgage Loans Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	0
After 5 Years Through 10 Years [Member] | Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	0
After 5 Years Through 10 Years [Member] | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, Adjustable Rate	$ 0