Securities, Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021 USD ($) Security	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) Security	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) Security
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 146,431		$ 146,431		$ 3,538
More than 12 months, fair value	0		0		0
Total, fair value	146,431		146,431		3,538
Less than 12 months, unrealized losses	4,548		4,548		17
More than 12 months, unrealized losses	0		0		0
Total, unrealized losses	$ 4,548		$ 4,548		$ 17
Less than 12 months, number of securities | Security	42		42		4
More than 12 months, number of securities | Security	0		0		0
Total, number of securities | Security	42		42		4
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 53,274		$ 53,274		$ 11,605
More than 12 months, fair value	476		476		361
Total, fair value	53,750		53,750		11,966
Less than 12 months, unrealized losses	791		791		41
More than 12 months, unrealized losses	23		23		128
Total, unrealized losses	$ 814		$ 814		$ 169
Less than 12 months, number of securities | Security	85		85		19
More than 12 months, number of securities | Security	1		1		1
Total, number of securities | Security	86		86		20
Total Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 199,705		$ 199,705		$ 15,143
More than 12 months, fair value	476		476		361
Total, fair value	200,181		200,181		15,504
Less than 12 months, unrealized losses	5,339		5,339		58
More than 12 months, unrealized losses	23		23		128
Total, unrealized losses	$ 5,362		$ 5,362		$ 186
Less than 12 months, number of securities | Security	127		127		23
More than 12 months, number of securities | Security	1		1		1
Total, number of securities | Security	128		128		24
Proceeds from sale of available-for-sale securities	$ 0	$ 0	$ 0	$ 0
Gross realized gains (losses) on sale of available-for-sale securities	0	0	0	0
Other-than-temporary impairment losses	0	$ 0	0	$ 0
U.S. Government Sponsored Enterprises [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	12,633		12,633
More than 12 months, fair value	0		0
Total, fair value	12,633		12,633
Less than 12 months, unrealized losses	448		448
More than 12 months, unrealized losses	0		0
Total, unrealized losses	$ 448		$ 448
Less than 12 months, number of securities | Security	3		3
More than 12 months, number of securities | Security	0		0
Total, number of securities | Security	3		3
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Total, unrealized losses					$ 0
U.S. Treasury Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 19,620		$ 19,620
More than 12 months, fair value	0		0
Total, fair value	19,620		19,620
Less than 12 months, unrealized losses	79		79
More than 12 months, unrealized losses	0		0
Total, unrealized losses	$ 79		$ 79
Less than 12 months, number of securities | Security	2		2
More than 12 months, number of securities | Security	0		0
Total, number of securities | Security	2		2
State and Political Subdivisions [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 33,767		$ 33,767		3,336
More than 12 months, fair value	0		0		0
Total, fair value	33,767		33,767		3,336
Less than 12 months, unrealized losses	426		426		3
More than 12 months, unrealized losses	0		0		0
Total, unrealized losses	$ 426		$ 426		$ 3
Less than 12 months, number of securities | Security	78		78		12
More than 12 months, number of securities | Security	0		0		0
Total, number of securities | Security	78		78		12
Mortgage-backed Securities-Residential [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 24,844		$ 24,844
More than 12 months, fair value	0		0
Total, fair value	24,844		24,844
Less than 12 months, unrealized losses	349		349
More than 12 months, unrealized losses	0		0
Total, unrealized losses	$ 349		$ 349
Less than 12 months, number of securities | Security	6		6
More than 12 months, number of securities | Security	0		0
Total, number of securities | Security	6		6
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 13,553		$ 13,553		$ 3,604
More than 12 months, fair value	0		0		0
Total, fair value	13,553		13,553		3,604
Less than 12 months, unrealized losses	202		202		15
More than 12 months, unrealized losses	0		0		0
Total, unrealized losses	$ 202		$ 202		$ 15
Less than 12 months, number of securities | Security	3		3		2
More than 12 months, number of securities | Security	0		0		0
Total, number of securities | Security	3		3		2
Mortgage-backed Securities-Multi-family [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 89,334		$ 89,334		$ 1,051
More than 12 months, fair value	0		0		0
Total, fair value	89,334		89,334		1,051
Less than 12 months, unrealized losses	3,672		3,672		4
More than 12 months, unrealized losses	0		0		0
Total, unrealized losses	$ 3,672		$ 3,672		$ 4
Less than 12 months, number of securities | Security	31		31		1
More than 12 months, number of securities | Security	0		0		0
Total, number of securities | Security	31		31		1
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 3,507		$ 3,507		$ 3,562
More than 12 months, fair value	0		0		0
Total, fair value	3,507		3,507		3,562
Less than 12 months, unrealized losses	110		110		21
More than 12 months, unrealized losses	0		0		0
Total, unrealized losses	$ 110		$ 110		$ 21
Less than 12 months, number of securities | Security	2		2		3
More than 12 months, number of securities | Security	0		0		0
Total, number of securities | Security	2		2		3
Corporate Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value					$ 2,487
More than 12 months, fair value					0
Total, fair value					2,487
Less than 12 months, unrealized losses					13
More than 12 months, unrealized losses					0
Total, unrealized losses					$ 13
Less than 12 months, number of securities | Security					3
More than 12 months, number of securities | Security					0
Total, number of securities | Security					3
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 2,447		$ 2,447		$ 1,103
More than 12 months, fair value	476		476		361
Total, fair value	2,923		2,923		1,464
Less than 12 months, unrealized losses	53		53		2
More than 12 months, unrealized losses	23		23		128
Total, unrealized losses	$ 76		$ 76		$ 130
Less than 12 months, number of securities | Security	2		2		2
More than 12 months, number of securities | Security	1		1		1
Total, number of securities | Security	3		3		3