Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Service charges on deposit accounts	$ 11,098	$ 12,970	$ 12,690
Other service charges, commissions, and fees:
Interchange income	14,142	13,814	11,995
Other fees	5,955	5,667	4,493
Commissions from sales of insurance and financial products:
Insurance income	5,353	5,289	6,038
Wealth management income	3,495	3,206	2,693
SBA consulting fees	8,644	3,872	4,675
Noninterest income (in-scope of Topic 606)	48,687	44,818	42,584
Noninterest income (out-of-scope of Topic 606)	32,659	14,711	16,358
Total noninterest income	$ 81,346	$ 59,529	$ 58,942