Fair Value Measurements and Fair Value of Financial Instruments, Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Assets [Abstract]
Securities available-for-sale	$ 120,806	$ 91,299
Recurring [Member]
Assets [Abstract]
Equity securities	217	184
Assets, Fair Value Disclosure	121,023	91,483
Recurring [Member] | U.S. Government Sponsored Enterprises [Member]
Assets [Abstract]
Securities available-for-sale	5,531	4,717
Recurring [Member] | State and Political Subdivisions [Member]
Assets [Abstract]
Securities available-for-sale	92,255	58,112
Recurring [Member] | Mortgage-backed Securities-residential [Member]
Assets [Abstract]
Securities available-for-sale	3,247	4,913
Recurring [Member] | Mortgage-backed Securities-multi-family [Member]
Assets [Abstract]
Securities available-for-sale	18,069	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	1,704	2,791
Recurring [Member] | Level 1 [Member]
Assets [Abstract]
Equity securities	217	184
Assets, Fair Value Disclosure	1,921	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	1,704	2,791
Recurring [Member] | Level 2 [Member]
Assets [Abstract]
Equity securities	0	0
Assets, Fair Value Disclosure	119,102	88,507
Recurring [Member] | Level 2 [Member] | U.S. Government Sponsored Enterprises [Member]
Assets [Abstract]
Securities available-for-sale	5,531	4,717
Recurring [Member] | Level 2 [Member] | State and Political Subdivisions [Member]
Assets [Abstract]
Securities available-for-sale	92,255	58,112
Recurring [Member] | Level 2 [Member] | Mortgage-backed Securities-residential [Member]
Assets [Abstract]
Securities available-for-sale	3,247	4,913
Recurring [Member] | Level 2 [Member] | Mortgage-backed Securities-multi-family [Member]
Assets [Abstract]
Securities available-for-sale	18,069	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 3 [Member]
Assets [Abstract]
Equity securities	0	0
Assets, Fair Value Disclosure	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