Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income before income taxes	$ 22,562	$ 14,199	$ 36,825	$ 29,386
Federal income tax rate	21.00%	21.00%	21.00%	21.00%
Federal income tax expense at statutory rate	$ 4,738	$ 2,982	$ 7,733	$ 6,171
(Reduction) increases in income taxes resulting from: Tax exempt interest	(91)	(138)	(185)	(282)
(Reduction) increases in income taxes resulting from: State tax, net of federal tax effect	1,456	809	2,240	2,050
(Reduction) increases in income taxes resulting from: Incentive stock option compensation expense	20	20	40	37
(Reduction) increases in income taxes resulting from: Income from bank-owned life insurance	(338)	(333)	(665)	(666)
(Reduction) increases in income taxes resulting from: Non-deductible merger-related expenses		20	49	20
(Reductions) increases in income taxes resulting from: Bargain purchase gain			(641)
Income Tax Reconciliation Utilization Of Capital Loss Carryforward	(375)		(375)
(Reductions) increases in income taxes resulting from: Other items, net	727	187	825	34
Income Tax Expense Benefit Before Valuation Allowance	6,137	3,547	9,021	7,364
Reversal of valuation allowance	(523)		(523)
Total income tax expense	$ 5,614	$ 3,547	$ 8,498	$ 7,364
Effective income tax rate	24.88%	24.98%	23.08%	25.06%