Disclosures about Fair Value of Assets - Fair Value Measurements of Assets Recognized on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016
Available-for-sale securities:
Available-for-sale securities, Fair Value	$ 113,321	$ 121,328
Mortgage servicing rights	518	440
U.S. Government, Federal Agency, and Government Sponsored Enterprises (GSE's) [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	80,971	90,105
Mortgage-backed: GSE Residential [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	28,471	27,245
State and Political Subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	3,879	3,978
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government, Federal Agency, and Government Sponsored Enterprises (GSE's) [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	80,971	90,105
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed: GSE Residential [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	28,471	27,245
Significant Other Observable Inputs (Level 2) [Member] | State and Political Subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	3,879	3,978
Significant Unobservable Inputs (Level 3) [Member]
Available-for-sale securities:
Mortgage servicing rights	$ 518	$ 440