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Goodwill and Other Intangible Assets - Summary of Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Aug. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]        
Goodwill $ 7,435 $ 7,400   $ 7,435
Gross carrying amount 2,048      
Accumulated amortization (549)      
Core deposit intangible, net 1,499      
Total $ 8,934 $ 9,312 $ 9,557