Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Available-for-sale debt securities [Abstract]
Amortized cost	$ 102,436	$ 90,429
Gross unrealized gains	524	962
Gross unrealized losses	193	92
Estimated fair value	102,767	91,299
Available-for-sale equity securities and other [Abstract]
Amortized cost	62	62
Gross unrealized gains	140	122
Gross unrealized losses	0	0
Estimated fair value	202	184
Available-for-sale securities [Abstract]
Amortized cost	102,498	90,491
Gross unrealized gains	664	1,084
Gross unrealized losses	193	92
Estimated fair value	102,969	91,483
Held-to-maturity securities [Abstract]
Amortized cost	239,140	223,830
Gross unrealized gains	4,849	4,988
Gross unrealized losses	702	366
Estimated fair value	243,287	228,452
Total Securities [Abstract]
Amortized cost	341,638	314,321
Gross unrealized gains	5,513	6,072
Gross unrealized losses	895	458
Estimated fair value	346,256	319,935
U.S. Government Sponsored Enterprises [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	5,552	4,566
Gross unrealized gains	83	151
Gross unrealized losses	12	0
Estimated fair value	5,623	4,717
State and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	71,627	57,885
Gross unrealized gains	97	227
Gross unrealized losses	4	0
Estimated fair value	71,720	58,112
Mortgage-backed Securities-Residential [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	4,098	4,868
Gross unrealized gains	41	72
Gross unrealized losses	43	27
Estimated fair value	4,096	4,913
Mortgage-backed Securities-Multi-family [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	19,899	20,344
Gross unrealized gains	303	483
Gross unrealized losses	131	62
Estimated fair value	20,071	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	1,260	2,765
Gross unrealized gains	0	29
Gross unrealized losses	3	3
Estimated fair value	1,257	2,791
U.S. Government Sponsored Enterprises [Member]
Held-to-maturity securities [Abstract]
Amortized cost	7,246	6,000
Gross unrealized gains	0	0
Gross unrealized losses	95	53
Estimated fair value	7,151	5,947
State and Political Subdivisions [Member]
Held-to-maturity securities [Abstract]
Amortized cost	127,725	115,805
Gross unrealized gains	3,967	3,434
Gross unrealized losses	205	95
Estimated fair value	131,487	119,144
Mortgage-backed Securities-Residential [Member]
Held-to-maturity securities [Abstract]
Amortized cost	7,479	10,798
Gross unrealized gains	184	274
Gross unrealized losses	0	2
Estimated fair value	7,663	11,070
Mortgage-backed Securities-Multi-family [Member]
Held-to-maturity securities [Abstract]
Amortized cost	94,183	88,702
Gross unrealized gains	664	1,259
Gross unrealized losses	399	199
Estimated fair value	94,448	89,762
Corporate Debt Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	1,000	1,000
Gross unrealized gains	15	0
Gross unrealized losses	0	5
Estimated fair value	1,015	995
Other Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	1,507	1,525
Gross unrealized gains	19	21
Gross unrealized losses	3	12
Estimated fair value	$ 1,523	$ 1,534