Investment Securities (Narrative) (Detail) (USD $)
 3 Months Ended
Sep. 30, 2012
Investment
Jun. 30, 2012
Investment
Sep. 30, 2012
U.S. Government and Agency Obligations [Member]
Investment
Sep. 30, 2012
Municipal Obligations [Member]
Investment
Sep. 30, 2012
Corporate Obligations [Member]
Investment
Sep. 30, 2012
Mortgage Backed and CMOs [Member]
Investment
Sep. 30, 2012
Collateralized Mortgage Obligations [Member]
Investment
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]              
Number of available for sale securities in unrealized loss position 16 25 5 4 1 6  
Securities in an unrealized loss position, aggregate depreciation from amortized cost basis     0.50% 2.90% 1.50% 2.90%  
Number of investments rated below investment grade             1
Investments rated below investment grade, fair value             $ 174,000
Investments rated below investment grade, unrealized loss             $ 26,000
Fair value of investments rated below investment grade as a percent of total fair value of all securities available for sale             13.00%