Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Available-for-sale debt securities [Abstract]
Amortized cost	$ 99,375	$ 90,429
Gross unrealized gains	1,263	962
Gross unrealized losses	23	92
Estimated fair value	100,615	91,299
Available-for-sale equity securities and other [Abstract]
Amortized cost	62	62
Gross unrealized gains	132	122
Gross unrealized losses	0	0
Estimated fair value	194	184
Available-for-sale securities [Abstract]
Amortized cost	99,437	90,491
Gross unrealized gains	1,395	1,084
Gross unrealized losses	23	92
Estimated fair value	100,809	91,483
Held-to-maturity securities [Abstract]
Amortized cost	225,694	223,830
Gross unrealized gains	6,526	4,988
Gross unrealized losses	360	366
Estimated fair value	231,860	228,452
Total Securities [Abstract]
Amortized cost	325,131	314,321
Gross unrealized gains	7,921	6,072
Gross unrealized losses	383	458
Estimated fair value	332,669	319,935
U.S. Government Sponsored Enterprises [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	4,561	4,566
Gross unrealized gains	137	151
Gross unrealized losses	0	0
Estimated fair value	4,698	4,717
State and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	67,915	57,885
Gross unrealized gains	259	227
Gross unrealized losses	1	0
Estimated fair value	68,173	58,112
Mortgage-backed Securities-Residential [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	4,470	4,868
Gross unrealized gains	69	72
Gross unrealized losses	4	27
Estimated fair value	4,535	4,913
Mortgage-backed Securities-Multi-family [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	20,167	20,344
Gross unrealized gains	723	483
Gross unrealized losses	16	62
Estimated fair value	20,874	20,765
Asset-backed Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost		1
Gross unrealized gains		0
Gross unrealized losses		0
Estimated fair value		1
Corporate Debt Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	2,262	2,765
Gross unrealized gains	75	29
Gross unrealized losses	2	3
Estimated fair value	2,335	2,791
U.S. Government Sponsored Enterprises [Member]
Held-to-maturity securities [Abstract]
Amortized cost	6,000	6,000
Gross unrealized gains	0	0
Gross unrealized losses	59	53
Estimated fair value	5,941	5,947
State and Political Subdivisions [Member]
Held-to-maturity securities [Abstract]
Amortized cost	120,168	115,805
Gross unrealized gains	3,714	3,434
Gross unrealized losses	136	95
Estimated fair value	123,746	119,144
Mortgage-backed Securities-Residential [Member]
Held-to-maturity securities [Abstract]
Amortized cost	8,136	10,798
Gross unrealized gains	339	274
Gross unrealized losses	0	2
Estimated fair value	8,475	11,070
Mortgage-backed Securities-Multi-family [Member]
Held-to-maturity securities [Abstract]
Amortized cost	88,879	88,702
Gross unrealized gains	2,453	1,259
Gross unrealized losses	150	199
Estimated fair value	91,182	89,762
Corporate Debt Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	1,000	1,000
Gross unrealized gains	0	0
Gross unrealized losses	2	5
Estimated fair value	998	995
Other Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	1,511	1,525
Gross unrealized gains	20	21
Gross unrealized losses	13	12
Estimated fair value	$ 1,518	$ 1,534