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Stock-based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 10, 2015
Dec. 10, 2013
Jul. 07, 2011
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Minimum age of employee to attain the plan       21 years    
Shares to be purchased for ESOP, from borrowed funds     384,900 384,900    
Shares to be purchased for ESOP, percentage of Common Stock       8.00%    
Repayment of loan on ESOP       20 years    
Employee stock ownership plan vesting period       6 years    
Number of shares paid under ESOP       380,444   380,444
Options granted       0    
Options vested during the period       0 0  
Total unrecognized compensation cost related to non-vested stock options       $ 236    
Weighted average recognition period for non-vested stock options       4 years 2 months 12 days    
Unrecognized compensation expense for non-vested restricted stock awards       $ 1,200    
Employee Severance [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares paid under ESOP       0 181  
Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Minimum hours of service for ESOP benefits       1000 hours    
Period of service to qualify for ESOP benefits       12 months    
Prorated vesting period       2 years    
Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Prorated vesting period       5 years    
Employee Stock Ownership Plan Esop [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage vested in accrued benefits under ESOP       100.00%    
Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee stock ownership plan vesting period   7 years        
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee stock ownership plan vesting period 8 years 10 years        
Weighted average recognition period for non-vested stock options       7 years 2 months 12 days    
Stock based compensation expense       $ 42    
Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Equity Incentive Plan       673,575    
Equity Incentive Plan [Member] | Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee stock ownership plan vesting period   7 years        
Equity Incentive Plan       481,125    
Approved restricted stock awards   167,000        
Restricted stock available for future grants       314,125    
Equity Incentive Plan [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee stock ownership plan vesting period   10 years       8 years
Equity Incentive Plan       192,450    
Approved restricted stock awards   85,500       16,900
Restricted stock available for future grants       90,050