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Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - Portfolio loans, net - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	$ 13,820
Total Recorded Investment	36,659		$ 38,507
Financing Receivable, Allowance for Credit Loss, Writeoff	(6,474)	$ (304)
Financing Receivable, Allowance for Credit Loss, Recovery	827	801
Financing receivable, allowance for credit loss	131,527	92,187	136,671	$ 69,995	$ 43,288
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	8,239		8,316
Total Recorded Investment	22,508		21,770
Financing Receivable, Allowance for Credit Loss, Writeoff	(3,739)	(63)
Financing Receivable, Allowance for Credit Loss, Recovery	327	504
Financing receivable, allowance for credit loss	55,941	45,981	58,812	33,949	27,455
Commercial - investor owned
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	455		716
Total Recorded Investment	7,379		9,579
Financing Receivable, Allowance for Credit Loss, Writeoff	(2,372)	(2)
Financing Receivable, Allowance for Credit Loss, Recovery	34	14
Financing receivable, allowance for credit loss	33,105	19,892	32,062	16,656	5,935
Commercial - owner occupied
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	2,331		6,024
Total Recorded Investment	2,589		2,940
Financing Receivable, Allowance for Credit Loss, Writeoff	(28)	0
Financing Receivable, Allowance for Credit Loss, Recovery	9	69
Financing receivable, allowance for credit loss	20,219	9,477	17,012	7,414	4,873
Construction and land development
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	0		0
Total Recorded Investment	0
Financing Receivable, Allowance for Credit Loss, Writeoff	0	(31)
Financing Receivable, Allowance for Credit Loss, Recovery	235	40
Financing receivable, allowance for credit loss	14,557	9,895	21,413	7,577	2,611
Residential real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	2,795		3,190
Total Recorded Investment	3,945		4,189
Financing Receivable, Allowance for Credit Loss, Writeoff	(271)	(122)
Financing Receivable, Allowance for Credit Loss, Recovery	143	157
Financing receivable, allowance for credit loss	4,305	5,395	4,585	3,349	1,280
Other
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance	0		18,246
Total Recorded Investment	238		29
Financing Receivable, Allowance for Credit Loss, Writeoff	(64)	(86)
Financing Receivable, Allowance for Credit Loss, Recovery	79	17
Financing receivable, allowance for credit loss	$ 3,400	$ 1,547	$ 2,787	$ 1,050	$ 1,134

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