Investment Securities - Investments with unrealized losses (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Jun. 30, 2023
Fair Value
Less than 12 Months		$ 27,509
12 Months or More	$ 152,324	131,038
Total Fair Value	152,324	158,547
Unrealized Losses
Less than 12 Months		(2,402)
12 Months or More	(28,698)	(28,120)
Total Unrealized Losses	(28,698)	(30,522)
Fair Value
Less than 12 Months		4,880
12 Months or More	77,624	77,373
Total Fair Value	77,624	82,253
Unrealized Losses
Less than 12 Months		(102)
12 Months or More	(16,229)	(17,275)
Total Unrealized Losses	(16,229)	(17,377)
Less than 12 Months Fair Value		32,389
12 Months or More Fair Value	229,948	208,411
Total Fair Value	229,948	240,800
Less than 12 Months Unrealized Losses		(2,504)
12 Months or More Unrealized Losses	(44,927)	(45,395)
Total Unrealized Losses	(44,927)	(47,899)
Mortgage-backed securities
Fair Value
Less than 12 Months		16,794
12 Months or More	96,656	86,371
Total Fair Value	96,656	103,165
Unrealized Losses
Less than 12 Months		(967)
12 Months or More	(17,164)	(16,550)
Total Unrealized Losses	(17,164)	(17,517)
Fair Value
12 Months or More	73,161	77,373
Total Fair Value	73,161	77,373
Unrealized Losses
12 Months or More	(16,195)	(17,275)
Total Unrealized Losses	(16,195)	(17,275)
U.S. agency collateralized mortgage obligations
Fair Value
12 Months or More	7,493	8,292
Total Fair Value	7,493	8,292
Unrealized Losses
12 Months or More	(1,695)	(1,782)
Total Unrealized Losses	(1,695)	(1,782)
U.S. government agency securities
Fair Value
12 Months or More	712	943
Total Fair Value	712	943
Unrealized Losses
12 Months or More	(82)	(89)
Total Unrealized Losses	(82)	(89)
Fair Value
Less than 12 Months		4,880
12 Months or More	4,463
Total Fair Value	4,463	4,880
Unrealized Losses
Less than 12 Months		(102)
12 Months or More	(34)
Total Unrealized Losses	(34)	(102)
Municipal bonds
Fair Value
12 Months or More	15,056	14,979
Total Fair Value	15,056	14,979
Unrealized Losses
12 Months or More	(4,964)	(5,102)
Total Unrealized Losses	(4,964)	(5,102)
Corporate bonds
Fair Value
Less than 12 Months		10,715
12 Months or More	32,407	20,453
Total Fair Value	32,407	31,168
Unrealized Losses
Less than 12 Months		(1,435)
12 Months or More	(4,793)	(4,597)
Total Unrealized Losses	$ (4,793)	$ (6,032)