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Derivative Instruments and Hedging Activities - Additional Information (Detail)
$ in Thousands
12 Months Ended
Jun. 30, 2019
USD ($)
Instrument
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Derivative [Line Items]      
Pipeline of loans held-for-sale $ 46,200    
Loan Origination Commitments [Member]      
Derivative [Line Items]      
Pipeline of loans held-for-sale 46,200 $ 10,800  
Counter Party [Member]      
Derivative [Line Items]      
Financial collateral received under the enforceable master netting arrangement 5,000 31,600  
Interest Expense [Member]      
Derivative [Line Items]      
Estimated cash flow hedge gain (loss) to be reclassified in next twelve months (2,500)    
Cash Flow Hedges [Member]      
Derivative [Line Items]      
Reclassifications to interest expense $ 6,753 (2,826) $ (6,734)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member]      
Derivative [Line Items]      
Number of interest rate derivative instruments held | Instrument 11    
Derivative, notional amount $ 825,000    
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]      
Derivative [Line Items]      
Reclassifications to interest expense $ 6,753 $ (1,853) $ (5,914)