Fair Value Measurements - Impaired Loans Remeasured and Reported at Fair Value of Underlying Collateral (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of impaired loans before allocations	$ 5,257	$ 2,161
Specific (allocations) reversals of prior allocations	(731)	1,179
Loans receivable, fair value disclosure	4,526	3,340
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of impaired loans before allocations	5,006	33,839
Specific (allocations) reversals of prior allocations	4,209	(3,623)
Loans receivable, fair value disclosure	$ 9,215	$ 30,216