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Derivative Instruments and Hedging Activities - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019 USD ($) Instrument	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($) Instrument	Mar. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)
Loan Origination Commitments [Member]
Derivative [Line Items]
Pipeline of loans held-for-sale	$ 15,400		$ 15,400		$ 10,800
Counter Party [Member]
Derivative [Line Items]
Financial collateral received under the enforceable master netting arrangement	15,000		15,000		$ 31,600
Interest Expense [Member]
Derivative [Line Items]
Estimated cash flow hedge gain (loss) to be reclassified in next twelve months			(6,700)
Cash Flow Hedges [Member]
Derivative [Line Items]
Reclassifications to interest expense	$ 2,159	$ (599)	$ 4,855	$ (3,281)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Number of interest rate derivative instruments held | Instrument	11		11
Derivative, notional amount	$ 825,000		$ 825,000
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]
Derivative [Line Items]
Reclassifications to interest expense	$ 2,159	$ (352)	$ 4,855	$ (2,475)

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994

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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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Number of interest rate derivative instruments held by the entity at the reporting date.

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- Definition

This is the principal amount outstanding for loans which are in the process of being securitized as of the date of the statement of financial position (across all types of loans).

+ References

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