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Junior Subordinated Debt/Trust Preferred Securities (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2009
USD ($)
Sep. 30, 2015
USD ($)
Aug. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
quarter
Sep. 30, 2015
USD ($)
Dec. 31, 2015
Debt Instrument [Line Items]                
Gain on redemption of Jr subordinated debentures       $ 0 $ 78,000 $ 0 $ 78,000  
Gain (loss) on fair value option of financial liability       (423,000) 148,000 48,000 346,000  
Adjustment related to fair value calculations net of tax       249,000 $ 86,000 28,000 $ 204,000  
Junior Subordinated Debt                
Debt Instrument [Line Items]                
Debt instrument, frequency of periodic payment quarterly              
Amount of junior subordinated debentures relating to trust preferred securities $ 15,000,000     12,000,000.0   $ 12,000,000.0    
Maximum number of consecutive quarters the entity defer interest payments without default or penalty | quarter           20    
Debt instrument, unamortized discount rate     40.00%          
Debt instrument, repurchased face amount   $ 3,000,000            
Gain on redemption of Jr subordinated debentures   $ 78,000            
Life of debt instrument           30 years    
Fair value measurement option, gain (loss) on long-term debt instruments       $ 4,262,000   $ 4,262,000    
Junior Subordinated Debt | Significant unobservable inputs level 3 | Discounted cash flow valuation technique                
Debt Instrument [Line Items]                
Discount rate           5.83%   6.82%
Junior Subordinated Debt | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable rate           1.29%    
Junior Subordinated Debt | United Security Bank                
Debt Instrument [Line Items]                
Amount of junior subordinated debentures relating to trust preferred securities     $ 3,000,000.0