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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |
Income before income taxes | $ 15,187 | $ 14,805
Federal income tax rate | 21.00% | 21.00%
Federal income tax expense at statutory rate | $ 3,189 | $ 3,109
(Reduction) increases in income taxes resulting from: Tax exempt interest | (144) | (149)
(Reduction) increases in income taxes resulting from: State tax, net of federal tax effect | 1,241 | 1,205
(Reduction) increases in income taxes resulting from: Incentive stock option compensation expense | 17 | 28
(Reduction) increases in income taxes resulting from: Income from bank-owned life insurance | (333) | (289)
(Reductions) increases in income taxes resulting from: Other items, net | (153) | 652
(Reductions) increases in income taxes resulting from: Impact of deferred tax rate adjustment |  | (897)
Total income tax expense | $ 3,817 | $ 3,659
Effective income tax rate | 25.13% | 24.71%

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