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Derivative Instruments and Hedging Activities - Additional Information (Detail)
12 Months Ended
Jun. 30, 2018
USD ($)
Instruments
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Derivative [Line Items]      
Termination value of derivatives in net liability position $ 0 $ 302,000  
Pipeline of loans held-for-sale 10,800,000    
Loan Origination Commitments [Member]      
Derivative [Line Items]      
Pipeline of loans held-for-sale 10,800,000 18,400,000  
Counter Party [Member]      
Derivative [Line Items]      
Financial collateral received under the enforceable master netting arrangement 31,600,000 5,800,000  
Financial collateral posted under the enforceable master netting arrangement   1,000,000  
Interest Expense [Member]      
Derivative [Line Items]      
Estimated cash flow hedge gain (loss) to be reclassified in next twelve months (7,000,000)    
Cash Flow Hedges [Member]      
Derivative [Line Items]      
Reclassifications to interest expense $ (2,826,000) (6,734,000) $ (7,663,000)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member]      
Derivative [Line Items]      
Number of interest rate derivative instruments held | Instruments 15    
Derivative, notional amount $ 1,200,000,000    
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]      
Derivative [Line Items]      
Reclassifications to interest expense $ (1,853,000) (5,914,000) (7,311,000)
Cash Flow Hedges [Member] | Interest Rate Caps [Member]      
Derivative [Line Items]      
Number of interest rate derivative instruments held | Instruments 1    
Derivative, notional amount $ 35,000,000    
Cash Flow Hedges [Member] | Interest Rate Caps [Member] | Interest Expense [Member]      
Derivative [Line Items]      
Reclassifications to interest expense $ (973,000) $ (820,000) $ (352,000)