Fair Value Disclosures (Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loan subject to fair value hedge $ 174,325 $ 183,830
Fair Value, Inputs, Level 3 [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loan subject to fair value hedge 174,325 183,830
Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loan subject to fair value hedge 12,331 12,372
Loans held-for-sale 9,160 10,613
Derivative financial instruments 1,061 1,054
Fair Value, Measurements, Recurring [Member] | Available-for-sale Securities [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
U.S. Government and agency 20,634 21,055
Municipal obligations 47,998 42,060
Corporate obligations 4,068 3,945
Mortgage backed securities government backed 10,275 6,847
Private lable CMOs 174 169
CMOs - government backed 15,104 15,201
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale 9,160 10,613
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
U.S. Government and agency 20,634 21,055
Municipal obligations 47,998 42,060
Corporate obligations 4,068 3,945
Mortgage backed securities government backed 10,275 6,847
Private lable CMOs 174 169
CMOs - government backed 15,104 15,201
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loan subject to fair value hedge 12,331 12,372
Derivative financial instruments $ 1,061 $ 1,054