Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) - Portfolio loans, net $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan		3
Financing Receivable, Troubled Debt Restructuring, Postmodification		$ 3,886
Financing Receivable, Troubled Debt Restructuring, Premodification		3,886
Total	$ 128,185	110,270	$ 131,527	$ 136,671	$ 92,187	$ 69,995	$ 43,288
Loans - Ending balance:
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	(15,233)			(16,139)
Total	$ 7,241,500			7,241,074
Commercial and industrial
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	1
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 3,731
Financing Receivable, Troubled Debt Restructuring, Premodification	3,731
Total	53,351	50,139	55,941	58,812	45,981	33,949	27,455
Loans - Ending balance:
Total	2,943,048			3,100,299
CRE - investor owned
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Total	36,003	25,019	33,105	32,062	19,892	16,656	5,935
Loans - Ending balance:
Total	1,646,021			1,589,419
CRE - owner occupied
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Total	15,564	11,088	20,219	17,012	9,477	7,414	4,873
Loans - Ending balance:
Total	1,554,727			1,498,408
Construction and land development
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Total	11,632	$ 15,962	14,557	21,413	9,895	7,577	2,611
Loans - Ending balance:
Total	556,776			546,686
Residential real estate
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan		2
Financing Receivable, Troubled Debt Restructuring, Postmodification		$ 155
Financing Receivable, Troubled Debt Restructuring, Premodification		155
Total	4,677	6,333	4,305	4,585	5,395	3,349	1,280
Loans - Ending balance:
Total	305,497			319,179
Other
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Total	6,958	$ 1,729	$ 3,400	2,787	$ 1,547	$ 1,050	$ 1,134
Loans - Ending balance:
Total	$ 235,431			$ 187,083