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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Jun. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income before income taxes | $ 15,722 |  | $ 7,639 | $ 44,944 | $ 22,025 |
Federal income tax rate | 21.00% | 28.00% | 28.00% | 21.00% | 28.00% | 35.00%
Federal income tax expense at statutory rate | $ 3,302 |  | $ 2,139 | $ 9,438 | $ 6,167 |
(Reduction) increases in income taxes resulting from: Tax exempt interest | (147) |  | (180) | (444) | (529) |
(Reduction) increases in income taxes resulting from: State tax, net of federal tax effect | 1,540 |  | 493 | 3,661 | 1,463 |
(Reduction) increases in income taxes resulting from: Incentive stock option compensation expense | 12 |  | 35 | 68 | 107 |
(Reduction) increases in income taxes resulting from: Income from bank-owned life insurance | (421) |  | (343) | (1,000) | (1,053) |
(Reduction) increases in income taxes resulting from: Disqualifying disposition of incentive stock options |  |  |  |  | (11) |
(Reduction) increases in income taxes resulting from: Non-deductible merger-related expenses |  |  | 94 |  | 294 |
(Reductions) increases in income taxes resulting from: Other items, net | 19 |  | 24 | 710 | 223 |
(Reductions) increases in income taxes resulting from: Impact of deferred tax rate adjustment |  |  |  | (820) | 3,486 |
Total income tax expense | $ 4,305 |  | $ 2,262 | $ 11,613 | $ 10,147 |
Effective income tax rate | 27.38% |  | 29.61% | 25.84% | 46.07% |

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