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Subordinated Debt (Details Textual) - USD ($)
9 Months Ended
Jun. 28, 2013
Jun. 28, 2013
Sep. 30, 2016
Oct. 20, 2015
Debt Instrument [Line Items]        
Warrants issued to purchase common stock (in shares) 48,750      
Common stock exercise price (in dollars per share) $ 19.33      
Volume-weighted average share price, period (in days) 20 days      
Weighted average share price (in dollars per share) $ 30.00      
Warrant exercise price description     The warrant will become exercisable on June 28, 2014, and, unless previously exercised, will expire on June 28, 2021. The Company has the right to force an exercise of the warrant after the debenture has been repaid in full if the 20-day volume-weighted average price of a share of its common stock exceeds $30.00.  
Fair value of warrants $ 300,000 $ 300,000    
Risk free interest rate (as a percent) 0.66%      
Expected dividend rate (as a percent) 1.19%      
Expected volatility rate (as a percent) 34.00%      
Expected term (in years) 3 years      
Subordinated Debt | 2021 Debenture        
Debt Instrument [Line Items]        
Subordinated debenture, principal amount $ 3,000,000 $ 3,000,000    
Fixed annual interest rate (as a percent) 8.00% 8.00%    
Subordinated debenture, maturity date   Jun. 28, 2021    
Subordinated debenture, maturity date range, start Jun. 28, 2016      
Subordinated Debt | 2025 Note        
Debt Instrument [Line Items]        
Subordinated debenture, principal amount       $ 10,000,000.0
Fixed annual interest rate (as a percent)       6.4375%
Subordinated Debt | 2026 Notes        
Debt Instrument [Line Items]        
Subordinated debenture, principal amount     $ 25,000,000.0  
Fixed annual interest rate (as a percent)     6.00%  
LIBOR | Subordinated Debt | 2026 Notes        
Debt Instrument [Line Items]        
Basis spread on variable rate     485.00%