Investment Securities - Investments with unrealized losses (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022
Fair Value
Less than 12 Months	$ 27,509	$ 129,754
12 Months or More	131,038	30,274
Total Fair Value	158,547	160,028
Unrealized Losses
Less than 12 Months	(2,402)	(14,287)
12 Months or More	(28,120)	(5,769)
Total Unrealized Losses	(30,522)	(20,056)
Fair Value
Less than 12 Months	4,880	88,321
12 Months or More	77,373
Total Fair Value	82,253	88,321
Unrealized Losses
Less than 12 Months	(102)	(13,814)
12 Months or More	(17,275)
Total Unrealized Losses	(17,377)	(13,814)
Less than 12 Months Fair Value	32,389	218,075
12 Months or More Fair Value	208,411	30,274
Total Fair Value	240,800	248,349
Less than 12 Months Unrealized Losses	(2,504)	(28,101)
12 Months or More Unrealized Losses	(45,395)	(5,769)
Total Unrealized Losses	(47,899)	(33,870)
Mortgage-backed securities
Fair Value
Less than 12 Months	16,794	93,726
12 Months or More	86,371	13,750
Total Fair Value	103,165	107,476
Unrealized Losses
Less than 12 Months	(967)	(10,351)
12 Months or More	(16,550)	(2,374)
Total Unrealized Losses	(17,517)	(12,725)
Fair Value
Less than 12 Months		88,321
12 Months or More	77,373
Total Fair Value	77,373	88,321
Unrealized Losses
Less than 12 Months		(13,814)
12 Months or More	(17,275)
Total Unrealized Losses	(17,275)	(13,814)
U.S. agency collateralized mortgage obligations
Fair Value
Less than 12 Months		2,968
12 Months or More	8,292	6,741
Total Fair Value	8,292	9,709
Unrealized Losses
Less than 12 Months		(488)
12 Months or More	(1,782)	(804)
Total Unrealized Losses	(1,782)	(1,292)
U.S. government agency securities
Fair Value
Less than 12 Months		61
12 Months or More	943	1,556
Total Fair Value	943	1,617
Unrealized Losses
Less than 12 Months		(3)
12 Months or More	(89)	(52)
Total Unrealized Losses	(89)	(55)
Fair Value
Less than 12 Months	4,880
Total Fair Value	4,880
Unrealized Losses
Less than 12 Months	(102)
Total Unrealized Losses	(102)
Municipal bonds
Fair Value
Less than 12 Months		7,415
12 Months or More	14,979	8,227
Total Fair Value	14,979	15,642
Unrealized Losses
Less than 12 Months		(1,979)
12 Months or More	(5,102)	(2,539)
Total Unrealized Losses	(5,102)	(4,518)
Corporate bonds
Fair Value
Less than 12 Months	10,715	25,584
12 Months or More	20,453
Total Fair Value	31,168	25,584
Unrealized Losses
Less than 12 Months	(1,435)	(1,466)
12 Months or More	(4,597)
Total Unrealized Losses	$ (6,032)	$ (1,466)