Loans Receivable - Loans Individually Evaluated for Impairment by Class of Loan (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance of loans individually identified for impairment accruing interest	$ 12.6	$ 13.9	$ 10.8

Reflects the carrying amount of loans deemed to be questionable as to collection on which interest is continuing to be earned or accrued.

No definition available.

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