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Loans and Allowance for Loan Losses - Categories of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018
Real estate loans
Total loans	$ 496,397		$ 493,753	$ 500,301
Unearned fees and discounts, net	(306)		(349)
Allowance for loan losses	6,222	$ 6,277	6,328	6,319	$ 6,181	$ 5,945
Loans, net	490,481		487,774
One- to four-family [Member]
Real estate loans
Total loans	127,679		129,290	130,800
Allowance for loan losses	991	990	1,031	1,023	1,012	997
Multi-family [Member]
Real estate loans
Total loans	102,756		104,663	108,391
Allowance for loan losses	1,562	1,602	1,642	1,668	1,656	1,650
Home equity lines of credit [Member]
Real estate loans
Total loans	8,867		8,938	8,913
Allowance for loan losses	90	90	89	103	91	91
Construction [Member]
Real estate loans
Total loans	18,749		16,113	12,447
Allowance for loan losses	217	204	213	170	169	168
Commercial [Member]
Real estate loans
Total loans	148,299		143,367	158,226
Allowance for loan losses	1,685	1,657	1,623	1,804	1,644	1,604
Commercial [Member]
Real estate loans
Total loans	82,692		84,246	74,231
Allowance for loan losses	1,610	1,664	1,659	1,481	1,547	1,373
Consumer [Member]
Real estate loans
Total loans	7,355		7,136	7,293
Allowance for loan losses	$ 67	$ 70	$ 71	$ 70	$ 62	$ 62

X

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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