Loans Held for Investment - Collateral Dependent Loans by Collateral Type (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	$ 43,530	$ 18,858
Office Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	133	148
Industrial Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	442	441
Retail Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	500	513
Land Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	5,143	5,197
Hotel Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	10,316	10,679
Residential Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	8	10
Business Assets
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	26,988	1,870
Investor loans secured by real estate
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	10,816	11,192
Investor loans secured by real estate | Office Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | Industrial Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | Retail Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	500	513
Investor loans secured by real estate | Land Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | Hotel Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	10,316	10,679
Investor loans secured by real estate | Residential Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | Business Assets
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | CRE non-owner-occupied
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	10,243	10,255
Investor loans secured by real estate | CRE non-owner-occupied | Office Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | CRE non-owner-occupied | Industrial Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | CRE non-owner-occupied | Retail Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	500	513
Investor loans secured by real estate | CRE non-owner-occupied | Land Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | CRE non-owner-occupied | Hotel Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	9,743	9,742
Investor loans secured by real estate | CRE non-owner-occupied | Residential Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | CRE non-owner-occupied | Business Assets
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | SBA secured by real estate
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	573	937
Investor loans secured by real estate | SBA secured by real estate | Office Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | SBA secured by real estate | Industrial Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | SBA secured by real estate | Retail Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | SBA secured by real estate | Land Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | SBA secured by real estate | Hotel Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	573	937
Investor loans secured by real estate | SBA secured by real estate | Residential Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Investor loans secured by real estate | SBA secured by real estate | Business Assets
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	5,476	5,541
Business loans secured by real estate | Office Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	133	148
Business loans secured by real estate | Industrial Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	442	441
Business loans secured by real estate | Retail Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | Land Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	4,901	4,952
Business loans secured by real estate | Hotel Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | Residential Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | Business Assets
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | SBA secured by real estate
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	575	589
Business loans secured by real estate | SBA secured by real estate | Office Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	133	148
Business loans secured by real estate | SBA secured by real estate | Industrial Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	442	441
Business loans secured by real estate | SBA secured by real estate | Retail Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | SBA secured by real estate | Land Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | SBA secured by real estate | Hotel Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | SBA secured by real estate | Residential Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | SBA secured by real estate | Business Assets
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | CRE owner-occupied
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	4,901	4,952
Business loans secured by real estate | CRE owner-occupied | Office Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | CRE owner-occupied | Industrial Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | CRE owner-occupied | Retail Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | CRE owner-occupied | Land Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	4,901	4,952
Business loans secured by real estate | CRE owner-occupied | Hotel Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | CRE owner-occupied | Residential Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Business loans secured by real estate | CRE owner-occupied | Business Assets
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	27,230	2,115
Commercial loans | Office Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | Industrial Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | Retail Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | Land Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	242	245
Commercial loans | Hotel Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | Residential Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | Business Assets
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	26,988	1,870
Commercial loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	26,588	1,462
Commercial loans | Commercial and industrial | Office Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | Commercial and industrial | Industrial Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | Commercial and industrial | Retail Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | Commercial and industrial | Land Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	242	245
Commercial loans | Commercial and industrial | Hotel Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | Commercial and industrial | Residential Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | Commercial and industrial | Business Assets
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	26,346	1,217
Commercial loans | SBA non-real estate secured
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	642	653
Commercial loans | SBA non-real estate secured | Office Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | SBA non-real estate secured | Industrial Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | SBA non-real estate secured | Retail Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | SBA non-real estate secured | Land Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | SBA non-real estate secured | Hotel Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | SBA non-real estate secured | Residential Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Commercial loans | SBA non-real estate secured | Business Assets
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	642	653
Retail loans
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	8	10
Retail loans | Office Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Retail loans | Industrial Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Retail loans | Retail Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Retail loans | Land Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Retail loans | Hotel Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Retail loans | Residential Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	8	10
Retail loans | Business Assets
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Retail loans | Single family residential
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	8	10
Retail loans | Single family residential | Office Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Retail loans | Single family residential | Industrial Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Retail loans | Single family residential | Retail Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Retail loans | Single family residential | Land Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Retail loans | Single family residential | Hotel Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	0	0
Retail loans | Single family residential | Residential Properties
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	8	10
Retail loans | Single family residential | Business Assets
Financing Receivable, Past Due [Line Items]
Collateral dependent loans	$ 0	$ 0