Securities - Schedule of Available for Sale Securities Pledged (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Jun. 30, 2021
Schedule Of Available For Sale Securities [Line Items]
Carrying value of securities pledged	$ 853,261	$ 581,974
FHLB of New York [Member]
Schedule Of Available For Sale Securities [Line Items]
Carrying value of securities pledged	155,868	170,120
Secure Public Funds On Deposit [Member]
Schedule Of Available For Sale Securities [Line Items]
Carrying value of securities pledged	324,425	137,778
Federal Reserve ("FRB") [Member]
Schedule Of Available For Sale Securities [Line Items]
Carrying value of securities pledged	$ 372,968	$ 274,076

Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

Name:	us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant