Securities, Components of Securities (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2021 USD ($) Category	Jun. 30, 2021 USD ($)
Available-for-sale debt securities [Abstract]
Amortized cost	$ 413,748	$ 390,415
Gross unrealized gains	1,282	1,879
Gross unrealized losses	2,655	1,404
Estimated fair value	412,375	390,890
Held-to-maturity securities [Abstract]
Amortized cost	575,898	496,914
Gross unrealized gains	21,003	22,600
Gross unrealized losses	1,749	472
Estimated fair value	595,152	519,042
Total Securities [Abstract]
Amortized cost	989,646	887,329
Gross unrealized gains	22,285	24,479
Gross unrealized losses	4,404	1,876
Estimated fair value	$ 1,007,527	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	$ 13,076	13,079
Gross unrealized gains	9	36
Gross unrealized losses	243	212
Estimated fair value	12,842	12,903
U.S. Treasury Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	19,647	19,672
Gross unrealized gains	101	165
Gross unrealized losses	6	1
Estimated fair value	19,742	19,836
Held-to-maturity securities [Abstract]
Amortized cost	10,941	10,938
Gross unrealized gains	5	28
Gross unrealized losses	18	2
Estimated fair value	10,928	10,964
State and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	225,770	200,436
Gross unrealized gains	143	220
Gross unrealized losses	0	0
Estimated fair value	225,913	200,656
Held-to-maturity securities [Abstract]
Amortized cost	376,886	341,364
Gross unrealized gains	16,140	17,184
Gross unrealized losses	1,128	303
Estimated fair value	391,898	358,245
Mortgage-backed Securities-Residential [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	36,642	34,861
Gross unrealized gains	292	287
Gross unrealized losses	121	167
Estimated fair value	36,813	34,981
Held-to-maturity securities [Abstract]
Amortized cost	25,473	28,450
Gross unrealized gains	594	584
Gross unrealized losses	52	90
Estimated fair value	26,015	28,944
Mortgage-backed Securities-Multi-family [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	115,606	119,359
Gross unrealized gains	626	1,042
Gross unrealized losses	2,243	994
Estimated fair value	113,989	119,407
Held-to-maturity securities [Abstract]
Amortized cost	126,085	100,330
Gross unrealized gains	4,077	4,635
Gross unrealized losses	298	12
Estimated fair value	129,864	104,953
Corporate Debt Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	3,007	3,008
Gross unrealized gains	111	129
Gross unrealized losses	42	30
Estimated fair value	3,076	3,107
Held-to-maturity securities [Abstract]
Amortized cost	12,389	9,892
Gross unrealized gains	111	111
Gross unrealized losses	75	65
Estimated fair value	12,425	9,938
Other Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	24,124	5,940
Gross unrealized gains	76	58
Gross unrealized losses	178	0
Estimated fair value	$ 24,022	$ 5,998