Securities, Components of Securities (Details) $ in Thousands	9 Months Ended
	Mar. 31, 2022 USD ($) Category	Jun. 30, 2021 USD ($)
Available-for-sale debt securities [Abstract]
Amortized cost	$ 427,758	$ 390,415
Gross unrealized gains	493	1,879
Gross unrealized losses	16,809	1,404
Estimated fair value	411,442	390,890
Held-to-maturity securities [Abstract]
Amortized cost	729,739	496,914
Gross unrealized gains	28,703	22,600
Gross unrealized losses	28,489	472
Estimated fair value	729,953	519,042
Total Securities [Abstract]
Amortized cost	1,157,497	887,329
Gross unrealized gains	29,196	24,479
Gross unrealized losses	45,298	1,876
Estimated fair value	$ 1,141,395	909,932
Number of categories utilized under risk management approach of diversified investing | Category	3
U.S. Government Sponsored Enterprises [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	$ 13,070	13,079
Gross unrealized gains	0	36
Gross unrealized losses	1,133	212
Estimated fair value	11,937	12,903
U.S. Treasury Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	20,186	19,672
Gross unrealized gains	0	165
Gross unrealized losses	1,205	1
Estimated fair value	18,981	19,836
Held-to-maturity securities [Abstract]
Amortized cost	28,621	10,938
Gross unrealized gains	0	28
Gross unrealized losses	994	2
Estimated fair value	27,627	10,964
State and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	231,733	200,436
Gross unrealized gains	442	220
Gross unrealized losses	158	0
Estimated fair value	232,017	200,656
Held-to-maturity securities [Abstract]
Amortized cost	472,018	341,364
Gross unrealized gains	28,246	17,184
Gross unrealized losses	17,380	303
Estimated fair value	482,884	358,245
Mortgage-backed Securities-Residential [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	34,606	34,861
Gross unrealized gains	10	287
Gross unrealized losses	2,132	167
Estimated fair value	32,484	34,981
Held-to-maturity securities [Abstract]
Amortized cost	24,171	28,450
Gross unrealized gains	48	584
Gross unrealized losses	1,131	90
Estimated fair value	23,088	28,944
Mortgage-backed Securities-Multi-family [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	110,287	119,359
Gross unrealized gains	33	1,042
Gross unrealized losses	11,731	994
Estimated fair value	98,589	119,407
Held-to-maturity securities [Abstract]
Amortized cost	186,971	100,330
Gross unrealized gains	386	4,635
Gross unrealized losses	8,567	12
Estimated fair value	178,790	104,953
Corporate Debt Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	17,876	3,008
Gross unrealized gains	8	129
Gross unrealized losses	450	30
Estimated fair value	17,434	3,107
Held-to-maturity securities [Abstract]
Amortized cost	17,904	9,892
Gross unrealized gains	23	111
Gross unrealized losses	417	65
Estimated fair value	17,510	9,938
Other Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	54	5,940
Gross unrealized gains	0	58
Gross unrealized losses	0	0
Estimated fair value	$ 54	$ 5,998