Loans Held for Investment - Summary of Nonaccrual Loans (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	$ 20,217,000	$ 20,217,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	13,608,000	13,608,000
Nonaccrual loans, ACL	2,549,000	2,549,000
Nonaccrual loans, Total Nonaccrual Loans	33,825,000	33,825,000	$ 8,500,000
Nonaccrual loans, Nonaccrual Loans With No ACL	20,217,000	20,217,000
Interest income	0	0
Investor loans secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	8,112,000	8,112,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	0	0
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Total Nonaccrual Loans	8,112,000	8,112,000
Nonaccrual loans, Nonaccrual Loans With No ACL	8,112,000	8,112,000
Investor loans secured by real estate \| CRE non-owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	5,322,000	5,322,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	0	0
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Total Nonaccrual Loans	5,322,000	5,322,000
Nonaccrual loans, Nonaccrual Loans With No ACL	5,322,000	5,322,000
Investor loans secured by real estate \| Construction and land
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	1,802,000	1,802,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	0	0
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Total Nonaccrual Loans	1,802,000	1,802,000
Nonaccrual loans, Nonaccrual Loans With No ACL	1,802,000	1,802,000
Investor loans secured by real estate \| SBA secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	988,000	988,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	0	0
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Total Nonaccrual Loans	988,000	988,000
Nonaccrual loans, Nonaccrual Loans With No ACL	988,000	988,000
Business loans secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	6,569,000	6,569,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	1,273,000	1,273,000
Nonaccrual loans, ACL	410,000	410,000
Nonaccrual loans, Total Nonaccrual Loans	7,842,000	7,842,000
Nonaccrual loans, Nonaccrual Loans With No ACL	6,569,000	6,569,000
Business loans secured by real estate \| SBA secured by real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	1,006,000	1,006,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	77,000	77,000
Nonaccrual loans, ACL	17,000	17,000
Nonaccrual loans, Total Nonaccrual Loans	1,083,000	1,083,000
Nonaccrual loans, Nonaccrual Loans With No ACL	1,006,000	1,006,000
Business loans secured by real estate \| CRE owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	5,563,000	5,563,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	1,196,000	1,196,000
Nonaccrual loans, ACL	393,000	393,000
Nonaccrual loans, Total Nonaccrual Loans	6,759,000	6,759,000
Nonaccrual loans, Nonaccrual Loans With No ACL	5,563,000	5,563,000
Commercial loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	4,874,000	4,874,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	12,206,000	12,206,000
Nonaccrual loans, ACL	2,139,000	2,139,000
Nonaccrual loans, Total Nonaccrual Loans	17,080,000	17,080,000
Nonaccrual loans, Nonaccrual Loans With No ACL	4,874,000	4,874,000
Commercial loans \| Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	1,606,000	1,606,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	4,464,000	4,464,000
Nonaccrual loans, ACL	646,000	646,000
Nonaccrual loans, Total Nonaccrual Loans	6,070,000	6,070,000
Nonaccrual loans, Nonaccrual Loans With No ACL	1,606,000	1,606,000
Commercial loans \| Franchise non-real estate secured
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	2,428,000	2,428,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	7,742,000	7,742,000
Nonaccrual loans, ACL	1,493,000	1,493,000
Nonaccrual loans, Total Nonaccrual Loans	10,170,000	10,170,000
Nonaccrual loans, Nonaccrual Loans With No ACL	2,428,000	2,428,000
Commercial loans \| SBA non-real estate secured
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	840,000	840,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	0	0
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Total Nonaccrual Loans	840,000	840,000
Nonaccrual loans, Nonaccrual Loans With No ACL	840,000	840,000
Retail loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	662,000	662,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	129,000	129,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Total Nonaccrual Loans	791,000	791,000
Nonaccrual loans, Nonaccrual Loans With No ACL	662,000	662,000
Retail loans \| Single family residential
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans, Collateral Dependent Loans	662,000	662,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Non-Collateral Dependent Loans	129,000	129,000
Nonaccrual loans, ACL	0	0
Nonaccrual loans, Total Nonaccrual Loans	791,000	791,000
Nonaccrual loans, Nonaccrual Loans With No ACL	$ 662,000	$ 662,000

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