Fair Value Measurements and Fair Value of Financial Instruments, Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Assets [Abstract]
Securities available-for-sale	$ 102,969	$ 91,483
Recurring [Member]
Assets [Abstract]
Securities available-for-sale	102,969	91,483
Recurring [Member] | U.S. Government Sponsored Enterprises [Member]
Assets [Abstract]
Securities available-for-sale	5,623	4,717
Recurring [Member] | State and Political Subdivisions [Member]
Assets [Abstract]
Securities available-for-sale	71,720	58,112
Recurring [Member] | Mortgage-backed Securities-Residential [Member]
Assets [Abstract]
Securities available-for-sale	4,096	4,913
Recurring [Member] | Mortgage-backed Securities-Multi-family [Member]
Assets [Abstract]
Securities available-for-sale	20,071	20,765
Recurring [Member] | Asset-backed Securities [Member]
Assets [Abstract]
Securities available-for-sale		1
Recurring [Member] | Corporate Debt Securities [Member]
Assets [Abstract]
Securities available-for-sale	1,257	2,791
Recurring [Member] | Equity Securities [Member]
Assets [Abstract]
Securities available-for-sale	202	184
Recurring [Member] | Level 1 [Member]
Assets [Abstract]
Securities available-for-sale	1,459	2,976
Recurring [Member] | Level 1 [Member] | U.S. Government Sponsored Enterprises [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 1 [Member] | State and Political Subdivisions [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 1 [Member] | Mortgage-backed Securities-Residential [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 1 [Member] | Mortgage-backed Securities-Multi-family [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 1 [Member] | Asset-backed Securities [Member]
Assets [Abstract]
Securities available-for-sale		1
Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member]
Assets [Abstract]
Securities available-for-sale	1,257	2,791
Recurring [Member] | Level 1 [Member] | Equity Securities [Member]
Assets [Abstract]
Securities available-for-sale	202	184
Recurring [Member] | Level 2 [Member]
Assets [Abstract]
Securities available-for-sale	101,510	88,507
Recurring [Member] | Level 2 [Member] | U.S. Government Sponsored Enterprises [Member]
Assets [Abstract]
Securities available-for-sale	5,623	4,717
Recurring [Member] | Level 2 [Member] | State and Political Subdivisions [Member]
Assets [Abstract]
Securities available-for-sale	71,720	58,112
Recurring [Member] | Level 2 [Member] | Mortgage-backed Securities-Residential [Member]
Assets [Abstract]
Securities available-for-sale	4,096	4,913
Recurring [Member] | Level 2 [Member] | Mortgage-backed Securities-Multi-family [Member]
Assets [Abstract]
Securities available-for-sale	20,071	20,765
Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member]
Assets [Abstract]
Securities available-for-sale		0
Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 2 [Member] | Equity Securities [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member] | U.S. Government Sponsored Enterprises [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member] | State and Political Subdivisions [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member] | Mortgage-backed Securities-Residential [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member] | Mortgage-backed Securities-Multi-family [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member]
Assets [Abstract]
Securities available-for-sale		0
Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member] | Equity Securities [Member]
Assets [Abstract]
Securities available-for-sale	$ 0	$ 0