Goodwill and Intangible Assets - Summary of Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 15,903	$ 15,903
Accumulated Amortization	(6,972)	(5,376)
Net Carrying Value	8,931	10,527
Core Deposit Intangible
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	14,103	14,103
Accumulated Amortization	(6,562)	(5,108)
Net Carrying Value	7,541	8,995
Customer List
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,800	1,800
Accumulated Amortization	(410)	(268)
Net Carrying Value	$ 1,390	$ 1,532