EMPLOYEE BENEFIT PLANS - Net Periodic Pension Cost (Details) - Pension plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Net periodic pension cost included in the Bank's consolidated statements of income
Service cost	$ 764	$ 728	$ 2,292	$ 2,184
Interest cost	514	451	1,542	1,357
Expected return on plan assets	(1,031)	(838)	(3,093)	(2,512)
Amortization of net actuarial loss	5	424	15	1,274
Net periodic pension cost	252	765	756	2,303
Other disclosures
Employer contributions	$ 0	$ 0	$ 0	$ 0