Loans Held for Investment - Summary of Nonaccrual Loans (Details) - USD ($)	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	$ 5,486,000
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	15,124,000
Nonaccrual loans, ACL	1,739,000
Nonaccrual loans, Total Nonaccrual Loans	20,610,000	$ 8,500,000
Nonaccrual loans, Nonaccrual Loans With No ACL	6,044,000
Interest income	0
Investor loans secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	2,512,000
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	559,000
Nonaccrual loans, ACL	0
Nonaccrual loans, Total Nonaccrual Loans	3,071,000
Nonaccrual loans, Nonaccrual Loans With No ACL	3,071,000
Investor loans secured by real estate \| Commercial real estate (“CRE”) non-owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	318,000
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	559,000
Nonaccrual loans, ACL	0
Nonaccrual loans, Total Nonaccrual Loans	877,000
Nonaccrual loans, Nonaccrual Loans With No ACL	877,000
Investor loans secured by real estate \| Multifamily
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	0
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	0
Nonaccrual loans, ACL	0
Nonaccrual loans, Total Nonaccrual Loans	0
Nonaccrual loans, Nonaccrual Loans With No ACL	0
Investor loans secured by real estate \| Construction and land
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	1,802,000
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	0
Nonaccrual loans, ACL	0
Nonaccrual loans, Total Nonaccrual Loans	1,802,000
Nonaccrual loans, Nonaccrual Loans With No ACL	1,802,000
Investor loans secured by real estate \| SBA secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	392,000
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	0
Nonaccrual loans, ACL	0
Nonaccrual loans, Total Nonaccrual Loans	392,000
Nonaccrual loans, Nonaccrual Loans With No ACL	392,000
Business loans secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	1,033,000
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	401,000
Nonaccrual loans, ACL	40,000
Nonaccrual loans, Total Nonaccrual Loans	1,434,000
Nonaccrual loans, Nonaccrual Loans With No ACL	1,033,000
Business loans secured by real estate \| SBA secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	1,033,000
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	79,000
Nonaccrual loans, ACL	13,000
Nonaccrual loans, Total Nonaccrual Loans	1,112,000
Nonaccrual loans, Nonaccrual Loans With No ACL	1,033,000
Business loans secured by real estate \| CRE owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	0
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	322,000
Nonaccrual loans, ACL	27,000
Nonaccrual loans, Total Nonaccrual Loans	322,000
Nonaccrual loans, Nonaccrual Loans With No ACL	0
Business loans secured by real estate \| Franchise real estate secured
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	0
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	0
Nonaccrual loans, ACL	0
Nonaccrual loans, Total Nonaccrual Loans	0
Nonaccrual loans, Nonaccrual Loans With No ACL	0
Commercial loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	1,941,000
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	13,806,000
Nonaccrual loans, ACL	1,696,000
Nonaccrual loans, Total Nonaccrual Loans	15,747,000
Nonaccrual loans, Nonaccrual Loans With No ACL	1,940,000
Commercial loans \| Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	1,063,000
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	4,613,000
Nonaccrual loans, ACL	215,000
Nonaccrual loans, Total Nonaccrual Loans	5,676,000
Nonaccrual loans, Nonaccrual Loans With No ACL	1,063,000
Commercial loans \| Franchise non-real estate secured
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	0
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	9,142,000
Nonaccrual loans, ACL	1,475,000
Nonaccrual loans, Total Nonaccrual Loans	9,142,000
Nonaccrual loans, Nonaccrual Loans With No ACL	0
Commercial loans \| SBA non-real estate secured
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	878,000
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	51,000
Nonaccrual loans, ACL	6,000
Nonaccrual loans, Total Nonaccrual Loans	929,000
Nonaccrual loans, Nonaccrual Loans With No ACL	877,000
Retail loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	0
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	358,000
Nonaccrual loans, ACL	3,000
Nonaccrual loans, Total Nonaccrual Loans	358,000
Nonaccrual loans, Nonaccrual Loans With No ACL	0
Retail loans \| Single family residential
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	0
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	358,000
Nonaccrual loans, ACL	3,000
Nonaccrual loans, Total Nonaccrual Loans	358,000
Nonaccrual loans, Nonaccrual Loans With No ACL	0
Retail loans \| Consumer
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	0
Nonaccrual loans, ACL	0
Nonaccrual loans, Non-Collateral Dependent Loans	0
Nonaccrual loans, ACL	0
Nonaccrual loans, Total Nonaccrual Loans	0
Nonaccrual loans, Nonaccrual Loans With No ACL	$ 0

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