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Goodwill and Intangibles - Additional information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Schedule Of Finite Lived Intangible Assets And Goodwill [Line Items]          
Goodwill $ 29,940,000   $ 29,940,000   $ 29,940,000
Impairment losses recognized on goodwill     0 $ 0  
Unamortized balance of intangible assets 1,525,000   1,525,000   1,793,000
Amortization of intangibles 87,000 $ 103,000 268,000 268,000  
Core Deposit Intangible          
Schedule Of Finite Lived Intangible Assets And Goodwill [Line Items]          
Unamortized balance of intangible assets $ 1,525,000   1,525,000   $ 1,793,000
Amortization of intangibles     $ 268,000 $ 268,000  
Core Deposit Intangible | Minimum          
Schedule Of Finite Lived Intangible Assets And Goodwill [Line Items]          
Intangible assets, estimated useful life     8 years    
Core Deposit Intangible | Maximum          
Schedule Of Finite Lived Intangible Assets And Goodwill [Line Items]          
Intangible assets, estimated useful life     10 years