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Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income [Line Items]    
Before Tax $ 5,879 $ 790
Tax effect (1,676) (225)
Net-of-tax amount 4,203 565
Realized gains on available-for-sale securities [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Before Tax 6,805 1,386
Amortization of Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Before Tax $ (926) $ (596)