Fair Value Disclosures (Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Loan Subject to Fair Value Hedge [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 12,372 $ 11,405
Total Realized/ Unrealized Gains (Losses) Included in Noninterest Income 44 1,035
Purchases, Sales, Issuances, and Settlements, net (85) (77)
Ending Balance 12,331 12,363
Derivative Financial Instruments [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance (1,054) 650
Total Realized/ Unrealized Gains (Losses) Included in Noninterest Income (7) (1,365)
Ending Balance $ (1,061) $ (715)