Securities (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2021 USD ($) Category	Jun. 30, 2020 USD ($)
Securities [Abstract]
Number of categories utilized under risk management approach of diversified investing | Category	3
Available-for-sale debt securities [Abstract]
Amortized cost	$ 390,415	$ 224,340
Gross unrealized gains	1,879	2,386
Gross unrealized losses	1,404	17
Estimated fair value	390,890	226,709
Held-to-maturity securities [Abstract]
Amortized cost	496,914	383,657
Gross unrealized gains	22,600	22,024
Gross unrealized losses	472	169
Estimated fair value	519,042	405,512
Total Securities [Abstract]
Amortized cost	887,329	607,997
Gross unrealized gains	24,479	24,410
Gross unrealized losses	1,876	186
Estimated fair value	909,932	632,221
U.S. Government Sponsored Enterprises [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	13,079	502
Gross unrealized gains	36	2
Gross unrealized losses	212	0
Estimated fair value	12,903	504
Held-to-maturity securities [Abstract]
Amortized cost		2,000
Gross unrealized gains		11
Gross unrealized losses		0
Estimated fair value		2,011
U.S. Treasury Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	19,672
Gross unrealized gains	165
Gross unrealized losses	1
Estimated fair value	19,836
Held-to-maturity securities [Abstract]
Amortized cost	10,938
Gross unrealized gains	28
Gross unrealized losses	2
Estimated fair value	10,964
State and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	200,436	176,064
Gross unrealized gains	220	1,043
Gross unrealized losses	0	0
Estimated fair value	200,656	177,107
Held-to-maturity securities [Abstract]
Amortized cost	341,364	210,535
Gross unrealized gains	17,184	14,286
Gross unrealized losses	303	3
Estimated fair value	358,245	224,818
Mortgage-backed Securities-Residential [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	34,861	15,148
Gross unrealized gains	287	380
Gross unrealized losses	167	0
Estimated fair value	34,981	15,528
Held-to-maturity securities [Abstract]
Amortized cost	28,450	38,884
Gross unrealized gains	584	1,002
Gross unrealized losses	90	15
Estimated fair value	28,944	39,871
Mortgage-backed Securities-Multi-Family [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	119,359	28,116
Gross unrealized gains	1,042	798
Gross unrealized losses	994	4
Estimated fair value	119,407	28,910
Held-to-maturity securities [Abstract]
Amortized cost	100,330	127,582
Gross unrealized gains	4,635	6,680
Gross unrealized losses	12	21
Estimated fair value	104,953	134,241
Corporate Debt Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	3,008	4,510
Gross unrealized gains	129	163
Gross unrealized losses	30	13
Estimated fair value	3,107	4,660
Held-to-maturity securities [Abstract]
Amortized cost	9,892	2,593
Gross unrealized gains	111	7
Gross unrealized losses	65	130
Estimated fair value	9,938	2,470
Other Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	5,940	2,063
Gross unrealized gains	58	38
Gross unrealized losses	0	0
Estimated fair value	$ 5,998	$ 2,101