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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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