Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income before income taxes	$ 24,215	$ 22,155	$ 76,772	$ 58,980
Statutory federal tax rate	21.00%	21.00%	21.00%	21.00%
Federal income tax expense at statutory rate	$ 5,085	$ 4,653	$ 16,122	$ 12,386
(Reduction) increases in income taxes resulting from: Tax exempt interest	(66)	(85)	(204)	(270)
(Reduction) increases in income taxes resulting from: State tax, net of federal tax effect	1,908	1,498	6,026	3,738
(Reduction) increases in income taxes resulting from: Incentive stock option compensation expense	3	23	42	63
(Reduction) increases in income taxes resulting from: Income from bank-owned life insurance	(317)	(324)	(973)	(989)
(Reduction) increases in income taxes resulting from: Non-deductible merger-related expenses	0	0	0	49
(Reductions) increases in income taxes resulting from: Bargain purchase gain	0		0	(641)
(Reduction) increase in income taxes resulting from: Utilization of capital loss carryforward		0
(Reductions) increases in income taxes resulting from: Other items, net	91	21	418	429
Income Tax Expense Benefit Before Valuation Allowance	6,522	5,744	20,595	14,765
Reversal of valuation allowance	0	(12)	0	(535)
Total income tax expense	$ 6,522	$ 5,732	$ 20,595	$ 14,230
Effective income tax rate	26.93%	25.87%	26.83%	24.13%