Derivative Instruments and Hedging Activities - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020 USD ($) Instrument	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) Instrument	Dec. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)
Loan Origination Commitments [Member]
Derivative [Line Items]
Pipeline of loans held-for-sale	$ 62,300		$ 62,300		$ 127,200
Counter Party [Member]
Derivative [Line Items]
Termination value of derivatives	13,000		13,000
Financial collateral not included as offsetting amounts	12,300		12,300
Interest Expense [Member]
Derivative [Line Items]
Estimated cash flow hedge gain (loss) to be reclassified in next twelve months			6,600
Cash Flow Hedges [Member]
Derivative [Line Items]
Reclassifications to interest expense	$ 2,217	$ (836)	$ 4,589	$ (2,207)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Number of interest rate derivative instruments held | Instrument	13		13
Derivative, notional amount	$ 1,190,000		$ 1,190,000