Securities, Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2020 USD ($) Security	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Security
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 18,635		$ 3,538
More than 12 months, fair value	0		0
Total, fair value	18,635		3,538
Less than 12 months, unrealized losses	223		17
More than 12 months, unrealized losses	0		0
Total, unrealized losses	$ 223		$ 17
Less than 12 months, number of securities | Security	6		4
More than 12 months, number of securities | Security	0		0
Total, number of securities | Security	6		4
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 8,295		$ 11,605
More than 12 months, fair value	428		361
Total, fair value	8,723		11,966
Less than 12 months, unrealized losses	34		41
More than 12 months, unrealized losses	65		128
Total, unrealized losses	$ 99		$ 169
Less than 12 months, number of securities | Security	28		19
More than 12 months, number of securities | Security	1		1
Total, number of securities | Security	29		20
Total Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 26,930		$ 15,143
More than 12 months, fair value	428		361
Total, fair value	27,358		15,504
Less than 12 months, unrealized losses	257		58
More than 12 months, unrealized losses	65		128
Total, unrealized losses	$ 322		$ 186
Less than 12 months, number of securities | Security	34		23
More than 12 months, number of securities | Security	1		1
Total, number of securities | Security	35		24
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
State and Political Subdivisions [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	4,845		$ 3,336
More than 12 months, fair value	0		0
Total, fair value	4,845		3,336
Less than 12 months, unrealized losses	28		3
More than 12 months, unrealized losses	0		0
Total, unrealized losses	$ 28		$ 3
Less than 12 months, number of securities | Security	23		12
More than 12 months, number of securities | Security	0		0
Total, number of securities | Security	23		12
Mortgage-backed Securities-Residential [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 7,228
More than 12 months, fair value	0
Total, fair value	7,228
Less than 12 months, unrealized losses	19
More than 12 months, unrealized losses	0
Total, unrealized losses	$ 19
Less than 12 months, number of securities | Security	2
More than 12 months, number of securities | Security	0
Total, number of securities | Security	2
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value			$ 3,604
More than 12 months, fair value			0
Total, fair value			3,604
Less than 12 months, unrealized losses			15
More than 12 months, unrealized losses			0
Total, unrealized losses	$ 0		$ 15
Less than 12 months, number of securities | Security			2
More than 12 months, number of securities | Security			0
Total, number of securities | Security			2
Mortgage-backed Securities-Multi-family [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	10,464		$ 1,051
More than 12 months, fair value	0		0
Total, fair value	10,464		1,051
Less than 12 months, unrealized losses	147		4
More than 12 months, unrealized losses	0		0
Total, unrealized losses	$ 147		$ 4
Less than 12 months, number of securities | Security	3		1
More than 12 months, number of securities | Security	0		0
Total, number of securities | Security	3		1
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 3,450		$ 3,562
More than 12 months, fair value	0		0
Total, fair value	3,450		3,562
Less than 12 months, unrealized losses	6		21
More than 12 months, unrealized losses	0		0
Total, unrealized losses	$ 6		$ 21
Less than 12 months, number of securities | Security	5		3
More than 12 months, number of securities | Security	0		0
Total, number of securities | Security	5		3
Corporate Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 943		$ 2,487
More than 12 months, fair value	0		0
Total, fair value	943		2,487
Less than 12 months, unrealized losses	57		13
More than 12 months, unrealized losses	0		0
Total, unrealized losses	$ 57		$ 13
Less than 12 months, number of securities | Security	1		3
More than 12 months, number of securities | Security	0		0
Total, number of securities | Security	1		3
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 0		$ 1,103
More than 12 months, fair value	428		361
Total, fair value	428		1,464
Less than 12 months, unrealized losses	0		2
More than 12 months, unrealized losses	65		128
Total, unrealized losses	$ 65		$ 130
Less than 12 months, number of securities | Security	0		2
More than 12 months, number of securities | Security	1		1
Total, number of securities | Security	1		3