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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Sep. 30, 2019
Aug. 31, 2018
Goodwill And Other Intangible Assets [Line Items]      
Goodwill $ 7,400 $ 7,435 $ 7,435
Finite-Lived Intangible Assets, Net, Ending Balance   $ 1,499  
Core Deposits [Member]      
Goodwill And Other Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 7 years    
Finite-Lived Intangible Assets, Net, Ending Balance $ 2,000    
The Peoples Bank [Member]      
Goodwill And Other Intangible Assets [Line Items]      
Goodwill $ 7,400   $ 7,400