Securities, Amortized Cost and Fair Value and Allowance for Credit Loss on Securities Held-to-Maturity (Details) - USD ($) $ in Thousands		Jun. 30, 2024	Jun. 30, 2023
Held-to-maturity securities [Abstract]
Amortized cost	[1]	$ 690,837	$ 726,363
Unrealized gains		4,604	5,178
Unrealized losses		65,200	60,475
Fair value		630,241	671,066
Allowance	[2]	483	0
Net carrying value		690,354	726,363
Accrued interest receivable		$ 4,100	$ 3,900
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]		Accrued interest receivable	Accrued interest receivable
U.S. Treasury Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	[1]	$ 23,785	$ 33,705
Unrealized gains		0	0
Unrealized losses		1,749	2,438
Fair value		22,036	31,267
Allowance	[2]	0	0
Net carrying value		23,785	33,705
State and Political Subdivisions [Member]
Held-to-maturity securities [Abstract]
Amortized cost	[1]	450,343	478,756
Unrealized gains		4,541	5,178
Unrealized losses		40,235	30,662
Fair value		414,649	453,272
Allowance	[2]	44	0
Net carrying value		450,299	478,756
Mortgage-backed Securities-Residential [Member]
Held-to-maturity securities [Abstract]
Amortized cost	[1]	48,033	37,186
Unrealized gains		51	0
Unrealized losses		3,314	3,625
Fair value		44,770	33,561
Allowance	[2]	0	0
Net carrying value		48,033	37,186
Mortgage-backed Securities-Multi-family [Member]
Held-to-maturity securities [Abstract]
Amortized cost	[1]	143,363	155,046
Unrealized gains		0	0
Unrealized losses		17,397	20,324
Fair value		125,966	134,722
Allowance	[2]	0	0
Net carrying value		143,363	155,046
Corporate Debt Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	[1]	25,282	21,632
Unrealized gains		12	0
Unrealized losses		2,505	3,426
Fair value		22,789	18,206
Allowance	[2]	438	0
Net carrying value		24,844	21,632
Other Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	[1]	31	38
Unrealized gains		0	0
Unrealized losses		0	0
Fair value		31	38
Allowance	[2]	1	0
Net carrying value		$ 30	$ 38

[1] Amortized cost excludes accrued interest receivable of $4.1 million and $3.9 million at June 30, 2024 and June 30, 2023, respectively, which is included in accrued interest receivable in the consolidated statements of financial condition.

[2] Effective July 1, 2023, the allowance calculation is based upon the CECL methodology.  Prior to July 1, 2023, the allowance calculation was based upon the incurred loss methodology.