Loans Held for Investment - Company's Investment in Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Impaired Loans
Unpaid Principal Balance	$ 12,154	$ 6,896
Total impaired loans	8,149	3,284
With Specific Allowance	0	97
Without Specific Allowance	8,149	3,187
Specific Allowance for Impaired Loans	0	55	$ 0
Average Recorded Investment	7,844	6,779	829
Interest Income Recognized	0	0	17
Business loans \| Commercial and industrial
Impaired Loans
Unpaid Principal Balance	1,520	1,585
Total impaired loans	1,067	1,160
With Specific Allowance	0	0
Without Specific Allowance	1,067	1,160
Specific Allowance for Impaired Loans	0	0	0
Average Recorded Investment	1,181	1,112	200
Interest Income Recognized	0	0	5
Business loans \| Franchise
Impaired Loans
Specific Allowance for Impaired Loans	0		0
Business loans \| Commercial owner occupied
Impaired Loans
Unpaid Principal Balance	3,598	98
Total impaired loans	3,475	97
With Specific Allowance	0	97
Without Specific Allowance	3,475	0
Specific Allowance for Impaired Loans	0	55	0
Average Recorded Investment	3,475	125	192
Interest Income Recognized	0	0	3
Business loans \| SBA
Impaired Loans
Unpaid Principal Balance	4,575	4,329
Total impaired loans	1,218	1,201
With Specific Allowance	0	0
Without Specific Allowance	1,218	1,201
Specific Allowance for Impaired Loans	0	0	0
Average Recorded Investment	1,241	1,123	307
Interest Income Recognized	0	0	5
Real estate loans \| Commercial non-owner occupied
Impaired Loans
Unpaid Principal Balance	0
Total impaired loans	0
With Specific Allowance	0
Without Specific Allowance	0
Specific Allowance for Impaired Loans	0
Real estate loans \| Multi-family
Impaired Loans
Unpaid Principal Balance	1,231
Total impaired loans	1,231
With Specific Allowance	0
Without Specific Allowance	1,231
Specific Allowance for Impaired Loans	0		0
Real estate loans \| One-to-four family
Impaired Loans
Unpaid Principal Balance	1,178	849
Total impaired loans	1,134	817
With Specific Allowance	0	0
Without Specific Allowance	1,134	817
Specific Allowance for Impaired Loans	0	0	0
Average Recorded Investment	1,024	341	116
Interest Income Recognized	0	0	3
Real estate loans \| Construction
Impaired Loans
Specific Allowance for Impaired Loans	0		0
Average Recorded Investment	0	4,069	0
Interest Income Recognized	0	0	0
Real estate loans \| Land
Impaired Loans
Unpaid Principal Balance	35	35
Total impaired loans	8	9
With Specific Allowance	0	0
Without Specific Allowance	8	9
Specific Allowance for Impaired Loans	0	0	0
Average Recorded Investment	8	9	14
Interest Income Recognized	0	0	1
Consumer Loans \| Consumer loans
Impaired Loans
Unpaid Principal Balance	17
Total impaired loans	16
With Specific Allowance	0
Without Specific Allowance	16
Specific Allowance for Impaired Loans	0		0
Average Recorded Investment	94	0	0
Interest Income Recognized	$ 0	$ 0	$ 0

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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