Securities - Summary of Amortized Cost and Fair Value of Securities Available for Sale, by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized Cost [Abstract]
Due in one year or less	$ 1,001
Due after one year through five years	8,227
Due after five years through ten years	21,930
Due after ten years	41,800
Amortized cost	72,958	$ 72,198
Fair Value [Abstract]
Due in one year or less	1,000
Due after one year through five years	8,067
Due after five years through ten years	21,442
Due after ten years	41,375
Total fair value	$ 71,884	$ 72,153