Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) loan	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Total		$ 43,288
Portfolio loans, net
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	92,187	69,995	$ 43,288
Loans - Ending balance:
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	(2,450)		(2,616)
Total	$ 5,459,967		5,316,953
Portfolio loans, net | 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	45,981	33,949	27,455
Loans - Ending balance:
Total	2,469,013		2,361,157
Portfolio loans, net | CRE - investor owned
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Total	19,892	16,656	5,935
Loans - Ending balance:
Total	1,327,814		1,299,884
Portfolio loans, net | CRE - owner occupied
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Total	9,477	7,414	4,873
Loans - Ending balance:
Total	720,543		697,437
Portfolio loans, net | Construction and land development
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Total	9,895	7,577	2,611
Loans - Ending balance:
Total	$ 469,627		457,273
Portfolio loans, net | 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	5,395	3,349	1,280
Loans - Ending balance:
Total	346,758		366,261
Portfolio loans, net | Consumer and other
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Total	1,547	$ 1,050	1,134
Loans - Ending balance:
Total	$ 126,212		$ 134,941