Securities - Summary of Amortized Cost and Fair Value of Securities Available for Sale, by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortized Cost [Abstract]
Due in one year or less	$ 14
Due after one year through five years	12,300
Due after five years through ten years	13,486
Due after ten years	44,962
Amortized cost	70,762	$ 72,958
Fair Value [Abstract]
Due in one year or less	14
Due after one year through five years	12,472
Due after five years through ten years	13,811
Due after ten years	46,260
Total fair value	$ 72,557	$ 71,884