Securities, Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2017 USD ($) Security	Sep. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Security
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 3,886		$ 8,412
Less than 12 months, unrealized losses	$ 22		$ 92
Less than 12 months, number of securities | Security	6		7
More than 12 months, fair value	$ 499		$ 0
More than 12 months, unrealized losses	$ 1		$ 0
More than 12 months, number of securities | Security	1		0
Total, fair value	$ 4,385		$ 8,412
Total, unrealized losses	$ 23		$ 92
Total, number of securities | Security	7		7
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 29,666		$ 42,072
Less than 12 months, unrealized losses	$ 251		$ 346
Less than 12 months, number of securities | Security	91		84
More than 12 months, fair value	$ 6,383		$ 588
More than 12 months, unrealized losses	$ 109		$ 20
More than 12 months, number of securities | Security	32		7
Total, fair value	$ 36,049		$ 42,660
Total, unrealized losses	$ 360		$ 366
Total, number of securities | Security	123		91
Total Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 33,552		$ 50,484
Less than 12 months, unrealized losses	$ 273		$ 438
Less than 12 months, number of securities | Security	97		91
More than 12 months, fair value	$ 6,882		$ 588
More than 12 months, unrealized losses	$ 110		$ 20
More than 12 months, number of securities | Security	33		7
Total, fair value	$ 40,434		$ 51,072
Total, unrealized losses	$ 383		$ 458
Total, number of securities | Security	130		98
Proceeds from sale of available-for-sale securities, debt	$ 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]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	149
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	$ 149
Total, unrealized losses	$ 1
Total, number of securities | Security	1
Mortgage-backed Securities-Residential [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 490		$ 1,164
Less than 12 months, unrealized losses	$ 4		$ 27
Less than 12 months, number of securities | Security	1		1
More than 12 months, fair value	$ 0		$ 0
More than 12 months, unrealized losses	$ 0		$ 0
More than 12 months, number of securities | Security	0		0
Total, fair value	$ 490		$ 1,164
Total, unrealized losses	$ 4		$ 27
Total, number of securities | Security	1		1
Mortgage-backed Securities-Multi-family [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 2,986		$ 6,488
Less than 12 months, unrealized losses	$ 16		$ 62
Less than 12 months, number of securities | Security	2		4
More than 12 months, fair value	$ 0		$ 0
More than 12 months, unrealized losses	$ 0		$ 0
More than 12 months, number of securities | Security	0		0
Total, fair value	$ 2,986		$ 6,488
Total, unrealized losses	$ 16		$ 62
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	$ 261		$ 760
Less than 12 months, unrealized losses	$ 1		$ 3
Less than 12 months, number of securities | Security	2		2
More than 12 months, fair value	$ 499		$ 0
More than 12 months, unrealized losses	$ 1		$ 0
More than 12 months, number of securities | Security	1		0
Total, fair value	$ 760		$ 760
Total, unrealized losses	$ 2		$ 3
Total, number of securities | Security	3		2
U.S. Government Sponsored Enterprises [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 3,958		$ 5,947
Less than 12 months, unrealized losses	$ 42		$ 53
Less than 12 months, number of securities | Security	1		2
More than 12 months, fair value	$ 1,983		$ 0
More than 12 months, unrealized losses	$ 17		$ 0
More than 12 months, number of securities | Security	1		0
Total, fair value	$ 5,941		$ 5,947
Total, unrealized losses	$ 59		$ 53
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	$ 10,455		$ 8,976
Less than 12 months, unrealized losses	$ 81		$ 76
Less than 12 months, number of securities | Security	74		64
More than 12 months, fair value	$ 2,526		$ 514
More than 12 months, unrealized losses	$ 55		$ 19
More than 12 months, number of securities | Security	28		6
Total, fair value	$ 12,981		$ 9,490
Total, unrealized losses	$ 136		$ 95
Total, number of securities | Security	102		70
Mortgage-backed Securities-Residential [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value			$ 1,864
Less than 12 months, unrealized losses			$ 2
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			$ 1,864
Total, unrealized losses	$ 0		$ 2
Total, number of securities | Security			1
Mortgage-backed Securities-Multi-family [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	13,660		$ 23,823
Less than 12 months, unrealized losses	$ 125		$ 199
Less than 12 months, number of securities | Security	12		15
More than 12 months, fair value	$ 1,421		$ 0
More than 12 months, unrealized losses	$ 25		$ 0
More than 12 months, number of securities | Security	2		0
Total, fair value	$ 15,081		$ 23,823
Total, unrealized losses	$ 150		$ 199
Total, number of securities | Security	14		15
Corporate Debt Securities [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 998		$ 995
Less than 12 months, unrealized losses	$ 2		$ 5
Less than 12 months, number of securities | Security	2		1
More than 12 months, fair value	$ 0		$ 0
More than 12 months, unrealized losses	$ 0		$ 0
More than 12 months, number of securities | Security	0		0
Total, fair value	$ 998		$ 995
Total, unrealized losses	$ 2		$ 5
Total, number of securities | Security	2		1
Other Securities [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 595		$ 467
Less than 12 months, unrealized losses	$ 1		$ 11
Less than 12 months, number of securities | Security	2		1
More than 12 months, fair value	$ 453		$ 74
More than 12 months, unrealized losses	$ 12		$ 1
More than 12 months, number of securities | Security	1		1
Total, fair value	$ 1,048		$ 541
Total, unrealized losses	$ 13		$ 12
Total, number of securities | Security	3		2