Securities, Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2019 USD ($) Security	Sep. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) Security
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 9,133		$ 856
Less than 12 months, unrealized losses	$ 33		$ 20
Less than 12 months, number of securities | Security	7		1
More than 12 months, fair value	$ 803		$ 0
More than 12 months, unrealized losses	$ 17		$ 0
More than 12 months, number of securities | Security	1		0
Total, fair value	$ 9,936		$ 856
Total, unrealized losses	$ 50		$ 20
Total, number of securities | Security	8		1
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 13,730		$ 4,791
Less than 12 months, unrealized losses	$ 60		$ 23
Less than 12 months, number of securities | Security	96		23
More than 12 months, fair value	$ 4,864		$ 8,348
More than 12 months, unrealized losses	$ 52		$ 56
More than 12 months, number of securities | Security	18		18
Total, fair value	$ 18,594		$ 13,139
Total, unrealized losses	$ 112		$ 79
Total, number of securities | Security	114		41
Total Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 22,863		$ 5,647
Less than 12 months, unrealized losses	$ 93		$ 43
Less than 12 months, number of securities | Security	103		24
More than 12 months, fair value	$ 5,667		$ 8,348
More than 12 months, unrealized losses	$ 69		$ 56
More than 12 months, number of securities | Security	19		18
Total, fair value	$ 28,530		$ 13,995
Total, unrealized losses	$ 162		$ 99
Total, number of securities | Security	122		42
Proceeds from sale of available-for-sale securities	$ 0	$ 0
Gross realized gains (losses) on sale of available-for-sale securities	0	0
Other-than-temporary impairment losses	0	$ 0
U.S. Government Sponsored Enterprises [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	0		$ 0
Less than 12 months, unrealized losses	$ 0		$ 0
Less than 12 months, number of securities | Security	0		0
More than 12 months, fair value	$ 1,988		$ 1,986
More than 12 months, unrealized losses	$ 12		$ 14
More than 12 months, number of securities | Security	1		1
Total, fair value	$ 1,988		$ 1,986
Total, unrealized losses	$ 12		$ 14
Total, number of securities | Security	1		1
State and Political Subdivisions [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 10,966		$ 3,541
Less than 12 months, unrealized losses	$ 58		$ 17
Less than 12 months, number of securities | Security	94		22
More than 12 months, fair value	$ 2,424		$ 2,111
More than 12 months, unrealized losses	$ 12		$ 6
More than 12 months, number of securities | Security	16		13
Total, fair value	$ 13,390		$ 5,652
Total, unrealized losses	$ 70		$ 23
Total, number of securities | Security	110		35
Mortgage-backed Securities-Residential [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 3,078		$ 856
Less than 12 months, unrealized losses	$ 2		$ 20
Less than 12 months, number of securities | Security	1		1
More than 12 months, fair value	$ 803		$ 0
More than 12 months, unrealized losses	$ 17		$ 0
More than 12 months, number of securities | Security	1		0
Total, fair value	$ 3,881		$ 856
Total, unrealized losses	$ 19		$ 20
Total, number of securities | Security	2		1
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Total, unrealized losses	$ 0		$ 0
Mortgage-backed Securities-Multi-family [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	3,085
Less than 12 months, unrealized losses	$ 1
Less than 12 months, number of securities | Security	1
More than 12 months, fair value	$ 0
More than 12 months, unrealized losses	$ 0
More than 12 months, number of securities | Security	0
Total, fair value	$ 3,085
Total, unrealized losses	$ 1
Total, number of securities | Security	1
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 2,764		1,250
Less than 12 months, unrealized losses	$ 2		$ 6
Less than 12 months, number of securities | Security	2		1
More than 12 months, fair value	$ 0		$ 3,799
More than 12 months, unrealized losses	$ 0		$ 11
More than 12 months, number of securities | Security	0		3
Total, fair value	$ 2,764		$ 5,049
Total, unrealized losses	$ 2		$ 17
Total, number of securities | Security	2		4
Corporate Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 2,970
Less than 12 months, unrealized losses	$ 30
Less than 12 months, number of securities | Security	5
More than 12 months, fair value	$ 0
More than 12 months, unrealized losses	$ 0
More than 12 months, number of securities | Security	0
Total, fair value	$ 2,970
Total, unrealized losses	$ 30
Total, number of securities | Security	5
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 0		$ 0
Less than 12 months, unrealized losses	$ 0		$ 0
Less than 12 months, number of securities | Security	0		0
More than 12 months, fair value	$ 452		$ 452
More than 12 months, unrealized losses	$ 28		$ 25
More than 12 months, number of securities | Security	1		1
Total, fair value	$ 452		$ 452
Total, unrealized losses	$ 28		$ 25
Total, number of securities | Security	1		1