Loans Held for Investment - Company's Investment in Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Impaired Loans
Contractual Unpaid Principal Balance	$ 2,391			$ 2,391		$ 7,029
Total impaired loans	1,393			1,393		1,141
With Specific Allowance	0			0		250
Without Specific Allowance	1,393			1,393		891
Specific Allowance for Impaired Loans	0		$ 2,417	0	$ 2,417	250
Average Recorded Investment	1,157	$ 471	5,897	819	3,918
Interest Income Recognized	22	10	95	47	193
Commercial and industrial
Impaired Loans
Contractual Unpaid Principal Balance	1,760			1,760		1,990
Total impaired loans	1,003			1,003		250
With Specific Allowance	0			0		250
Without Specific Allowance	1,003			1,003		0
Specific Allowance for Impaired Loans	0		1,990	0	1,990	250
Average Recorded Investment	446	7	1,387	218	682
Interest Income Recognized	7	0	16	12	28
Franchise
Impaired Loans
Specific Allowance for Impaired Loans	0		0	0	0
Average Recorded Investment	0	0	974	0	1,355
Interest Income Recognized	0	0	16	0	68
Commercial owner occupied
Impaired Loans
Contractual Unpaid Principal Balance	227			227		847
Total impaired loans	186			186		436
With Specific Allowance	0			0		0
Without Specific Allowance	186			186		436
Specific Allowance for Impaired Loans	0		73	0	73	0
Average Recorded Investment	170	125	518	162	510
Interest Income Recognized	3	2	9	8	27
SBA
Impaired Loans
Contractual Unpaid Principal Balance	234			234		3,865
Total impaired loans	90			90		316
With Specific Allowance	0			0		0
Without Specific Allowance	90			90		316
Specific Allowance for Impaired Loans	0		354	0	354	0
Average Recorded Investment	85	222	381	204	217
Interest Income Recognized	2	4	7	10	11
Commercial non-owner occupied
Impaired Loans
Specific Allowance for Impaired Loans	0		0	0	0
Average Recorded Investment	342	0	2,487	114	877
Interest Income Recognized	7	0	42	7	44
One-to-four family
Impaired Loans
Contractual Unpaid Principal Balance	135			135		291
Total impaired loans	103			103		124
With Specific Allowance	0			0		0
Without Specific Allowance	103			103		124
Specific Allowance for Impaired Loans	0		0	0	0	0
Average Recorded Investment	103	105	133	108	259
Interest Income Recognized	3	3	4	9	13
Land
Impaired Loans
Contractual Unpaid Principal Balance	35			35		36
Total impaired loans	11			11		15
With Specific Allowance	0			0		0
Without Specific Allowance	11			11		15
Specific Allowance for Impaired Loans	0		0	0	0	$ 0
Average Recorded Investment	11	12	17	13	18
Interest Income Recognized	$ 0	$ 1	$ 1	$ 1	$ 2

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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