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Securities Available for Sale - Sales of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Investments Debt And Equity Securities [Abstract]    
Proceeds from sales of securities $ 51,989 $ 51,989
Gross realized gains 190 190
Gross realized losses (372) (372)
Net loss on sales of securities $ (182) $ (182)