Loans Held for Investment - Company's Investment in Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Impaired Loans
Unpaid Principal Balance	$ 10,082			$ 10,082		$ 6,896
Total impaired loans	6,039			6,039		3,284
With Specific Allowance	0			0		97
Without Specific Allowance	6,039			6,039		3,187
Specific Allowance for Impaired Loans	0		$ 0	0	$ 0	55
Average Recorded Investment	7,402	$ 7,844	471	7,623	829
Interest Income Recognized	0	0	10	0	27
Business loans \| Commercial and industrial
Impaired Loans
Unpaid Principal Balance	1,523			1,523		1,585
Total impaired loans	1,062			1,062		1,160
With Specific Allowance	0			0		0
Without Specific Allowance	1,062			1,062		1,160
Specific Allowance for Impaired Loans	0		0	0	0	0
Average Recorded Investment	1,272	1,181	7	1,226	200
Interest Income Recognized	0	0	0	0	5
Business loans \| Franchise
Impaired Loans
Unpaid Principal Balance	205			205
Total impaired loans	209			209
With Specific Allowance	0			0
Without Specific Allowance	209			209
Specific Allowance for Impaired Loans	0		0	0	0
Average Recorded Investment	70	0	0	35	0
Interest Income Recognized	0	0	0	0	0
Business loans \| Commercial owner occupied
Impaired Loans
Unpaid Principal Balance						98
Total impaired loans						97
With Specific Allowance						97
Without Specific Allowance						0
Specific Allowance for Impaired Loans	0		0	0	0	55
Average Recorded Investment	2,317	3,475	125	2,896	192
Interest Income Recognized	0	0	2	0	5
Business loans \| SBA
Impaired Loans
Unpaid Principal Balance	4,926			4,926		4,329
Total impaired loans	1,423			1,423		1,201
With Specific Allowance	0			0		0
Without Specific Allowance	1,423			1,423		1,201
Specific Allowance for Impaired Loans	0		0	0	0	0
Average Recorded Investment	1,360	1,241	222	1,300	307
Interest Income Recognized	0	0	4	0	9
Real estate loans \| Commercial non-owner occupied
Impaired Loans
Unpaid Principal Balance	1,287			1,287
Total impaired loans	1,290			1,290
With Specific Allowance	0			0
Without Specific Allowance	1,290			1,290
Specific Allowance for Impaired Loans	0		0	0	0
Average Recorded Investment	430	0	0	215	0
Interest Income Recognized	0	0	0	0	0
Real estate loans \| Multi-family
Impaired Loans
Unpaid Principal Balance	589			589
Total impaired loans	589			589
With Specific Allowance	0			0
Without Specific Allowance	589			589
Specific Allowance for Impaired Loans	0		0	0	0
Average Recorded Investment	589	821	0	705	0
Interest Income Recognized	0	0	0	0	0
Real estate loans \| One-to-four family
Impaired Loans
Unpaid Principal Balance	1,502			1,502		849
Total impaired loans	1,445			1,445		817
With Specific Allowance	0			0		0
Without Specific Allowance	1,445			1,445		817
Specific Allowance for Impaired Loans	0		0	0	0	0
Average Recorded Investment	1,343	1,024	105	1,184	116
Interest Income Recognized	0	0	3	0	6
Real estate loans \| Construction
Impaired Loans
Specific Allowance for Impaired Loans	0		0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Real estate loans \| Land
Impaired Loans
Unpaid Principal Balance	34			34		35
Total impaired loans	6			6		9
With Specific Allowance	0			0		0
Without Specific Allowance	6			6		9
Specific Allowance for Impaired Loans	0		0	0	0	$ 0
Average Recorded Investment	6	8	12	7	14
Interest Income Recognized	0	0	1	0	2
Consumer Loans \| Consumer loans
Impaired Loans
Unpaid Principal Balance	16			16
Total impaired loans	15			15
With Specific Allowance	0			0
Without Specific Allowance	15			15
Specific Allowance for Impaired Loans	0		0	0	0
Average Recorded Investment	15	94	0	55	0
Interest Income Recognized	$ 0	$ 0	$ 0	$ 0	$ 0

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

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