Loans Held for Investment - Company's Investment in Impaired Loans (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2019	Mar. 31, 2020
Impaired Loans
Unpaid Principal Balance		$ 24,256,000
Recorded Investment		22,842,000
With Specific Allowance		0
Without Specific Allowance		22,842,000
Specific Allowance for Impaired Loans		0
Average Recorded Investment	$ 17,786	20,097
Interest Income Recognized	89	249
Specific Allowance for Impaired Loans		0	$ 1,900,000
Investor loans secured by real estate \| Commercial real estate (“CRE”) non-owner-occupied
Impaired Loans
Unpaid Principal Balance		1,184,000
Recorded Investment		1,088,000
With Specific Allowance		0
Without Specific Allowance		1,088,000
Specific Allowance for Impaired Loans		0
Average Recorded Investment	0	1,061
Interest Income Recognized	0	0
Specific Allowance for Impaired Loans		0
Investor loans secured by real estate \| Multifamily
Impaired Loans
Unpaid Principal Balance		0
Recorded Investment		0
With Specific Allowance		0
Without Specific Allowance		0
Specific Allowance for Impaired Loans		0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Specific Allowance for Impaired Loans		0
Investor loans secured by real estate \| Construction and land
Impaired Loans
Unpaid Principal Balance		0
Recorded Investment		0
With Specific Allowance		0
Without Specific Allowance		0
Specific Allowance for Impaired Loans		0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Specific Allowance for Impaired Loans		0
Investor loans secured by real estate \| SBA secured by real estate
Impaired Loans
Unpaid Principal Balance		772,000
Recorded Investment		390,000
With Specific Allowance		0
Without Specific Allowance		390,000
Specific Allowance for Impaired Loans		0
Average Recorded Investment	1,889	422
Interest Income Recognized	0	0
Specific Allowance for Impaired Loans		0
Business loans secured by real estate \| SBA secured by real estate
Impaired Loans
Unpaid Principal Balance		1,743,000
Recorded Investment		1,517,000
With Specific Allowance		0
Without Specific Allowance		1,517,000
Specific Allowance for Impaired Loans		0
Average Recorded Investment	280	1,409
Interest Income Recognized	0	16
Specific Allowance for Impaired Loans		0
Business loans secured by real estate \| CRE owner-occupied
Impaired Loans
Unpaid Principal Balance		0
Recorded Investment		0
With Specific Allowance		0
Without Specific Allowance		0
Specific Allowance for Impaired Loans		0
Average Recorded Investment	576	749
Interest Income Recognized	0	0
Specific Allowance for Impaired Loans		0
Business loans secured by real estate \| Franchise real estate secured
Impaired Loans
Unpaid Principal Balance		0
Recorded Investment		0
With Specific Allowance		0
Without Specific Allowance		0
Specific Allowance for Impaired Loans		0
Average Recorded Investment	3,787	0
Interest Income Recognized	0	0
Specific Allowance for Impaired Loans		0
Commercial loans \| Commercial and industrial
Impaired Loans
Unpaid Principal Balance		7,755,000
Recorded Investment		7,529,000
With Specific Allowance		0
Without Specific Allowance		7,529,000
Specific Allowance for Impaired Loans		0
Average Recorded Investment	9,503	11,227
Interest Income Recognized	89	82
Specific Allowance for Impaired Loans		0
Commercial loans \| Franchise non-real estate secured
Impaired Loans
Unpaid Principal Balance		10,835,000
Recorded Investment		10,834,000
With Specific Allowance		0
Without Specific Allowance		10,834,000
Specific Allowance for Impaired Loans		0
Average Recorded Investment	189	3,615
Interest Income Recognized	0	151
Specific Allowance for Impaired Loans		0
Commercial loans \| SBA non-real estate secured
Impaired Loans
Unpaid Principal Balance		1,555,000
Recorded Investment		1,118,000
With Specific Allowance		0
Without Specific Allowance		1,118,000
Specific Allowance for Impaired Loans		0
Average Recorded Investment	1,110	1,247
Interest Income Recognized	0	0
Specific Allowance for Impaired Loans		0
Retail loans \| Single family residential
Impaired Loans
Unpaid Principal Balance		412,000
Recorded Investment		366,000
With Specific Allowance		0
Without Specific Allowance		366,000
Specific Allowance for Impaired Loans		0
Average Recorded Investment	395	367
Interest Income Recognized	0	0
Specific Allowance for Impaired Loans		0
Retail loans \| Consumer
Impaired Loans
Unpaid Principal Balance		0
Recorded Investment		0
With Specific Allowance		0
Without Specific Allowance		0
Specific Allowance for Impaired Loans		0
Average Recorded Investment	57	0
Interest Income Recognized	$ 0	0
Specific Allowance for Impaired Loans		$ 0

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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