Securities, Components of Securities (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2023 USD ($) Category	Jun. 30, 2022 USD ($)
Securities [Abstract]
Number of categories utilized under risk management approach of diversified investing | Category	3
Available-for-sale debt securities [Abstract]
Amortized cost	$ 309,153	$ 431,625
Gross unrealized gains	670	374
Gross unrealized losses	28,690	23,937
Estimated fair value	281,133	408,062
Held-to-maturity securities [Abstract]
Amortized cost	726,363	761,852
Gross unrealized gains	5,178	2,779
Gross unrealized losses	60,475	54,178
Estimated fair value	671,066	710,453
Total Securities [Abstract]
Amortized cost	1,035,516	1,193,477
Gross unrealized gains	5,848	3,153
Gross unrealized losses	89,165	78,115
Estimated fair value	952,199	1,118,515
U.S. Government Sponsored Enterprises [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	13,054	13,066
Gross unrealized gains	0	0
Gross unrealized losses	2,231	1,747
Estimated fair value	10,823	11,319
U.S. Treasury Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	18,349	20,158
Gross unrealized gains	0	0
Gross unrealized losses	1,849	1,731
Estimated fair value	16,500	18,427
Held-to-maturity securities [Abstract]
Amortized cost	33,705	33,623
Gross unrealized gains	0	0
Gross unrealized losses	2,438	1,643
Estimated fair value	31,267	31,980
State and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	137,343	247,978
Gross unrealized gains	670	374
Gross unrealized losses	2	276
Estimated fair value	138,011	248,076
Held-to-maturity securities [Abstract]
Amortized cost	478,756	493,897
Gross unrealized gains	5,178	2,760
Gross unrealized losses	30,662	35,747
Estimated fair value	453,272	460,910
Mortgage-backed Securities-Residential [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	29,586	33,186
Gross unrealized gains	0	0
Gross unrealized losses	3,985	3,289
Estimated fair value	25,601	29,897
Held-to-maturity securities [Abstract]
Amortized cost	37,186	42,461
Gross unrealized gains	0	1
Gross unrealized losses	3,625	2,242
Estimated fair value	33,561	40,220
Mortgage-backed Securities-Multi-family [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	91,016	99,353
Gross unrealized gains	0	0
Gross unrealized losses	18,930	15,644
Estimated fair value	72,086	83,709
Held-to-maturity securities [Abstract]
Amortized cost	155,046	171,921
Gross unrealized gains	0	2
Gross unrealized losses	20,324	13,895
Estimated fair value	134,722	158,028
Corporate Debt Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	19,805	17,884
Gross unrealized gains	0	0
Gross unrealized losses	1,693	1,250
Estimated fair value	18,112	16,634
Held-to-maturity securities [Abstract]
Amortized cost	21,632	19,900
Gross unrealized gains	0	16
Gross unrealized losses	3,426	651
Estimated fair value	18,206	19,265
Other Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	38	50
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	$ 38	$ 50