Loans Held for Investment - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance	$ 49,210	$ 18,858
Collateral Dependent Loans, ACL	4,382	1,455
Non-Collateral Dependent Loans, Balance	11,254	12,415
Non-Collateral Dependent Loans, ACL	0	0
Total Nonaccrual Loans	60,464	31,273
Nonaccrual Loans with No ACL	42,328	23,657
Investor loans secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance	32,403	11,192
Collateral Dependent Loans, ACL	2,640	1,455
Non-Collateral Dependent Loans, Balance	0	0
Non-Collateral Dependent Loans, ACL	0	0
Total Nonaccrual Loans	32,403	11,192
Nonaccrual Loans with No ACL	16,009	3,577
Investor loans secured by real estate \| CRE non-owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance	23,050	10,255
Collateral Dependent Loans, ACL	2,640	1,455
Non-Collateral Dependent Loans, Balance	0	0
Non-Collateral Dependent Loans, ACL	0	0
Total Nonaccrual Loans	23,050	10,255
Nonaccrual Loans with No ACL	6,656	2,640
Investor loans secured by real estate \| Multifamily
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance	8,806
Collateral Dependent Loans, ACL	0
Non-Collateral Dependent Loans, Balance	0
Non-Collateral Dependent Loans, ACL	0
Total Nonaccrual Loans	8,806
Nonaccrual Loans with No ACL	8,806
Investor loans secured by real estate \| SBA secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance	547	937
Collateral Dependent Loans, ACL	0	0
Non-Collateral Dependent Loans, Balance	0	0
Non-Collateral Dependent Loans, ACL	0	0
Total Nonaccrual Loans	547	937
Nonaccrual Loans with No ACL	547	937
Business loans secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance	11,446	5,541
Collateral Dependent Loans, ACL	1,742	0
Non-Collateral Dependent Loans, Balance	0	0
Non-Collateral Dependent Loans, ACL	0	0
Total Nonaccrual Loans	11,446	5,541
Nonaccrual Loans with No ACL	9,704	5,541
Business loans secured by real estate \| SBA secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance	197	589
Collateral Dependent Loans, ACL	0	0
Non-Collateral Dependent Loans, Balance	0	0
Non-Collateral Dependent Loans, ACL	0	0
Total Nonaccrual Loans	197	589
Nonaccrual Loans with No ACL	197	589
Business loans secured by real estate \| CRE owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance	11,249	4,952
Collateral Dependent Loans, ACL	1,742	0
Non-Collateral Dependent Loans, Balance	0	0
Non-Collateral Dependent Loans, ACL	0	0
Total Nonaccrual Loans	11,249	4,952
Nonaccrual Loans with No ACL	9,507	4,952
Commercial loans
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance	5,361	2,115
Collateral Dependent Loans, ACL	0	0
Non-Collateral Dependent Loans, Balance	11,254	12,415
Non-Collateral Dependent Loans, ACL	0	0
Total Nonaccrual Loans	16,615	14,530
Nonaccrual Loans with No ACL	16,615	14,529
Commercial loans \| Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance	4,754	1,462
Collateral Dependent Loans, ACL	0	0
Non-Collateral Dependent Loans, Balance	0	336
Non-Collateral Dependent Loans, ACL	0	0
Total Nonaccrual Loans	4,754	1,798
Nonaccrual Loans with No ACL	4,754	1,797
Commercial loans \| Franchise non-real estate secured
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance	0	0
Collateral Dependent Loans, ACL	0	0
Non-Collateral Dependent Loans, Balance	11,254	12,079
Non-Collateral Dependent Loans, ACL	0	0
Total Nonaccrual Loans	11,254	12,079
Nonaccrual Loans with No ACL	11,254	12,079
Commercial loans \| SBA non-real estate secured
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance	607	653
Collateral Dependent Loans, ACL	0	0
Non-Collateral Dependent Loans, Balance	0	0
Non-Collateral Dependent Loans, ACL	0	0
Total Nonaccrual Loans	607	653
Nonaccrual Loans with No ACL	$ 607	653
Retail loans
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance		10
Collateral Dependent Loans, ACL		0
Non-Collateral Dependent Loans, Balance		0
Non-Collateral Dependent Loans, ACL		0
Total Nonaccrual Loans		10
Nonaccrual Loans with No ACL		10
Retail loans \| Single family residential
Financing Receivable, Nonaccrual [Line Items]
Collateral Dependent Loans , Balance		10
Collateral Dependent Loans, ACL		0
Non-Collateral Dependent Loans, Balance		0
Non-Collateral Dependent Loans, ACL		0
Total Nonaccrual Loans		10
Nonaccrual Loans with No ACL		$ 10

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