Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Available-for-sale debt securities [Abstract]
Amortized cost	$ 117,537	$ 90,429
Gross unrealized gains	299	962
Gross unrealized losses	415	92
Estimated fair value	117,421	91,299
Available-for-sale equity securities and other [Abstract]
Amortized cost	62	62
Gross unrealized gains	144	122
Gross unrealized losses	0	0
Estimated fair value	206	184
Available-for-sale securities [Abstract]
Amortized cost	117,599	90,491
Gross unrealized gains	443	1,084
Gross unrealized losses	415	92
Estimated fair value	117,627	91,483
Held-to-maturity securities [Abstract]
Amortized cost	277,432	223,830
Gross unrealized gains	3,153	4,988
Gross unrealized losses	2,786	366
Estimated fair value	277,799	228,452
Total Securities [Abstract]
Amortized cost	395,031	314,321
Gross unrealized gains	3,596	6,072
Gross unrealized losses	3,201	458
Estimated fair value	395,426	319,935
U.S. Government Sponsored Enterprises [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	5,548	4,566
Gross unrealized gains	42	151
Gross unrealized losses	20	0
Estimated fair value	5,570	4,717
State and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	87,351	57,885
Gross unrealized gains	114	227
Gross unrealized losses	3	0
Estimated fair value	87,462	58,112
Mortgage-backed Securities-Residential [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	3,810	4,868
Gross unrealized gains	21	72
Gross unrealized losses	94	27
Estimated fair value	3,737	4,913
Mortgage-backed Securities-Multi-family [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	19,055	20,344
Gross unrealized gains	122	483
Gross unrealized losses	247	62
Estimated fair value	18,930	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	1,773	2,765
Gross unrealized gains	0	29
Gross unrealized losses	51	3
Estimated fair value	1,722	2,791
U.S. Government Sponsored Enterprises [Member]
Held-to-maturity securities [Abstract]
Amortized cost	9,242	6,000
Gross unrealized gains	0	0
Gross unrealized losses	218	53
Estimated fair value	9,024	5,947
State and Political Subdivisions [Member]
Held-to-maturity securities [Abstract]
Amortized cost	134,697	115,805
Gross unrealized gains	2,807	3,434
Gross unrealized losses	576	95
Estimated fair value	136,928	119,144
Mortgage-backed Securities-Residential [Member]
Held-to-maturity securities [Abstract]
Amortized cost	6,938	10,798
Gross unrealized gains	92	274
Gross unrealized losses	4	2
Estimated fair value	7,026	11,070
Mortgage-backed Securities-Multi-family [Member]
Held-to-maturity securities [Abstract]
Amortized cost	123,204	88,702
Gross unrealized gains	228	1,259
Gross unrealized losses	1,977	199
Estimated fair value	121,455	89,762
Corporate Debt Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	1,000	1,000
Gross unrealized gains	9	0
Gross unrealized losses	0	5
Estimated fair value	1,009	995
Other Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	2,351	1,525
Gross unrealized gains	17	21
Gross unrealized losses	11	12
Estimated fair value	$ 2,357	$ 1,534