Disclosures about Fair Value of Assets and Liabilities - Fair Value Measurements of Assets Recognized on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Available-for-sale securities:
Available-for-sale securities, Fair Value	$ 147,975	$ 146,291
Mortgage servicing rights	836	853
U.S. Government and Federal Agency and Government Sponsored Enterprises (GSEs) [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	11,090	12,950
Mortgage-backed Securities - GSE Residential [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	129,464	125,510
Small Business Administration [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	4,513	4,935
State and Political Subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	2,908	2,896
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Federal Agency and Government Sponsored Enterprises (GSEs) [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	11,090	12,950
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed Securities - GSE Residential [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	129,464	125,510
Significant Other Observable Inputs (Level 2) [Member] | Small Business Administration [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	4,513	4,935
Significant Other Observable Inputs (Level 2) [Member] | State and Political Subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	2,908	2,896
Significant Unobservable Inputs (Level 3) [Member]
Available-for-sale securities:
Mortgage servicing rights	$ 836	$ 853