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EMPLOYEE BENEFIT PLANS - Net Periodic Pension Cost (Details) - Pension plan - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Net periodic pension cost included in the Bank’s consolidated statements of income        
Service cost $ 761 $ 610 $ 1,456 $ 1,126
Interest cost 448 501 906 984
Expected return on plan assets (838) (924) (1,674) (1,851)
Amortization of net actuarial loss 417 268 850 540
Net periodic cost 788 455 1,538 799
Other disclosures        
Employer contributions $ 0 $ 0 $ 0 $ 0