Revenue From Contracts With Customers - Summary of Revenue From Contracts With Customers in-Scope and Not in-Scope under Topic 606 (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Total in-scope non-interest income									$ 3,813	$ 2,547	$ 1,952
Non-interest income, not in scope									14,507	10,295	11,249
Total noninterest income	$ 5,823	$ 2,799	$ 5,496	$ 4,202	$ 5,489	$ 2,105	$ 2,793	$ 2,455	18,320	12,842	13,201
Fees and Service Charges on Deposit Accounts
Disaggregation Of Revenue [Line Items]
Total in-scope non-interest income									1,366	1,115	1,164
Other Fees
Disaggregation Of Revenue [Line Items]
Total in-scope non-interest income									1,118	723	145
Other Income
Disaggregation Of Revenue [Line Items]
Total in-scope non-interest income									1,429	$ 709	501
(Loss) Gain on Sale of OREO and Fixed Assets
Disaggregation Of Revenue [Line Items]
Total in-scope non-interest income									$ (100)		$ 142