Loans Held for Investment - Summary of Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	$ 21,984	$ 14,037
ACL	0	0
Non-Collateral Dependent Loans	16,925	15,172
ACL	688	126
Total Nonaccrual Loans	38,909	29,209
Nonaccrual Loans with No ACL	35,431	27,968
Investor loans secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	12,724	4,049
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	12,724	4,049
Nonaccrual Loans with No ACL	12,724	4,049
Investor loans secured by real estate \| CRE non-owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	12,284	2,792
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	12,284	2,792
Nonaccrual Loans with No ACL	12,284	2,792
Investor loans secured by real estate \| SBA secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	440	1,257
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	440	1,257
Nonaccrual Loans with No ACL	440	1,257
Business loans secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	6,787	7,226
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	6,787	7,226
Nonaccrual Loans with No ACL	6,787	7,226
Business loans secured by real estate \| SBA secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	727	1,143
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	727	1,143
Nonaccrual Loans with No ACL	727	1,143
Business loans secured by real estate \| CRE owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	6,060	6,083
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	6,060	6,083
Nonaccrual Loans with No ACL	6,060	6,083
Commercial loans
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	2,459	2,747
ACL	0	0
Non-Collateral Dependent Loans	16,925	15,172
ACL	688	126
Total Nonaccrual Loans	19,384	17,919
Nonaccrual Loans with No ACL	15,906	16,678
Commercial loans \| Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	1,767	2,040
ACL	0	0
Non-Collateral Dependent Loans	3,843	1,934
ACL	688	126
Total Nonaccrual Loans	5,610	3,974
Nonaccrual Loans with No ACL	2,132	2,733
Commercial loans \| Franchise non-real estate secured
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	0	0
ACL	0	0
Non-Collateral Dependent Loans	13,082	13,238
ACL	0	0
Total Nonaccrual Loans	13,082	13,238
Nonaccrual Loans with No ACL	13,082	13,238
Commercial loans \| SBA non-real estate secured
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	692	707
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	692	707
Nonaccrual Loans with No ACL	692	707
Retail loans
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	14	15
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	14	15
Nonaccrual Loans with No ACL	14	15
Retail loans \| Single family residential
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	14	15
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	14	15
Nonaccrual Loans with No ACL	$ 14	$ 15

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