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Stock Based Compensation Plans (Additional Information) (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May. 31, 2010
Apr. 30, 2010
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 177,549   355,885   355,885  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award   101,681        
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased   $ 13.60        
Nonvested, Beginning Balance $ 13.25       $ 13.25  
Restricted Stock or Unit Expense     $ 31,000 $ 65,000 $ 162,000 $ 195,000
Stock or Unit Option Plan Expense     $ 18,000 $ 38,000 $ 95,000 $ 114,000
Share Based Compensation Arrangement By Share Based Payment Award Value Of Shares Purchased For Award   $ 1,400,000        
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other than Options Grants In Period Aggregate Fair Value $ 1,300,000          
Decrease In Additional Paid In Capital $ 41,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 3.09          
Vested         19,610  
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period         20,972  
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vested         19,610 19,620
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value         $ 575,000 $ 479,000
Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 76,655          
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period         20,972