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Benefit Plans - Schedule of Impact of Retrospective Application to Consolidated Statement of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Miscellaneous non-interest expense: |  |  |  |
Miscellaneous | $ 3,425 | $ 2,862 | $ 10,257 | $ 8,051
Salaries and employee benefits: |  |  |  |
Salaries and employee benefits | $ 15,350 | 12,814 | $ 46,691 | 38,458
As Previously Reported [Member] |  |  |  |
Miscellaneous non-interest expense: |  |  |  |
Miscellaneous |  | 2,788 |  | 7,828
Salaries and employee benefits: |  |  |  |
Salaries and employee benefits |  | 12,888 |  | 38,681
As Reported Under the New Guidance [Member] |  |  |  |
Miscellaneous non-interest expense: |  |  |  |
Miscellaneous |  | 2,862 |  | 8,051
Salaries and employee benefits: |  |  |  |
Salaries and employee benefits |  | $ 12,814 |  | $ 38,458

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