XML 65 R54.htm IDEA: XBRL DOCUMENT v3.19.1
Securities Held to Maturity - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Investments Debt And Equity Securities [Abstract]        
Proceeds from sales of securities held to maturity $ 0 $ 0 $ 0 $ 0