Loans Held for Investment - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	$ 21,251	$ 14,037
ACL	0	0
Non-Collateral Dependent Loans	13,136	15,172
ACL	0	126
Total Nonaccrual Loans	34,387	29,209
Nonaccrual Loans with No ACL	34,387	27,968
Investor loans secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	12,736	4,049
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	12,736	4,049
Nonaccrual Loans with No ACL	12,736	4,049
Investor loans secured by real estate \| CRE non-owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	12,296	2,792
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	12,296	2,792
Nonaccrual Loans with No ACL	12,296	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	5,708	7,226
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	5,708	7,226
Nonaccrual Loans with No ACL	5,708	7,226
Business loans secured by real estate \| SBA secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	692	1,143
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	692	1,143
Nonaccrual Loans with No ACL	692	1,143
Business loans secured by real estate \| CRE owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	5,016	6,083
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	5,016	6,083
Nonaccrual Loans with No ACL	5,016	6,083
Commercial loans
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	2,795	2,747
ACL	0	0
Non-Collateral Dependent Loans	13,136	15,172
ACL	0	126
Total Nonaccrual Loans	15,931	17,919
Nonaccrual Loans with No ACL	15,931	16,678
Commercial loans \| Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	2,118	2,040
ACL	0	0
Non-Collateral Dependent Loans	552	1,934
ACL	0	126
Total Nonaccrual Loans	2,670	3,974
Nonaccrual Loans with No ACL	2,670	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	12,584	13,238
ACL	0	0
Total Nonaccrual Loans	12,584	13,238
Nonaccrual Loans with No ACL	12,584	13,238
Commercial loans \| SBA non-real estate secured
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	677	707
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	677	707
Nonaccrual Loans with No ACL	677	707
Retail loans
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	12	15
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	12	15
Nonaccrual Loans with No ACL	12	15
Retail loans \| Single family residential
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans	12	15
ACL	0	0
Non-Collateral Dependent Loans	0	0
ACL	0	0
Total Nonaccrual Loans	12	15
Nonaccrual Loans with No ACL	$ 12	$ 15

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