Loans Held for Investment - Company's Investment in Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Impaired Loans
Unpaid Principal Balance	$ 25,750			$ 25,750		$ 17,440
Total impaired loans	15,103			15,103		12,458
With Specific Allowance	0			0		1,038
Without Specific Allowance	15,103			15,103		11,420
Specific Allowance for Impaired Loans	0		$ 0	0	$ 0	584
Average Recorded Investment	18,575	$ 17,786	7,402	18,181	7,623
Interest Income Recognized	109	89	0	199	0
Business loans \| Commercial and industrial
Impaired Loans
Unpaid Principal Balance	3,417			3,417		1,071
Total impaired loans	2,935			2,935		1,023
With Specific Allowance	0			0		550
Without Specific Allowance	2,935			2,935		473
Specific Allowance for Impaired Loans	0		0	0	0	118
Average Recorded Investment	2,614	2,003	1,272	2,309	1,226
Interest Income Recognized	0	0	0	0	0
Business loans \| Franchise
Impaired Loans
Unpaid Principal Balance	697			697		190
Total impaired loans	697			697		189
With Specific Allowance	0			0		0
Without Specific Allowance	697			697		189
Specific Allowance for Impaired Loans	0		0	0	0	0
Average Recorded Investment	4,047	3,976	70	4,012	35
Interest Income Recognized	0	0	0	0	0
Business loans \| Commercial owner occupied
Impaired Loans
Unpaid Principal Balance	564			564		628
Total impaired loans	564			564		599
With Specific Allowance	0			0		0
Without Specific Allowance	564			564		599
Specific Allowance for Impaired Loans	0		0	0	0	0
Average Recorded Investment	564	576	2,317	570	2,896
Interest Income Recognized	0	0	0	0	0
Business loans \| SBA
Impaired Loans
Unpaid Principal Balance	9,059			9,059		7,598
Total impaired loans	2,338			2,338		2,739
With Specific Allowance	0			0		488
Without Specific Allowance	2,338			2,338		2,251
Specific Allowance for Impaired Loans	0		0	0	0	466
Average Recorded Investment	3,139	3,279	1,360	3,209	1,300
Interest Income Recognized	0	0	0	0	0
Business loans \| Agribusiness
Impaired Loans
Unpaid Principal Balance	7,466			7,466		7,500
Total impaired loans	7,466			7,466		7,500
With Specific Allowance	0			0		0
Without Specific Allowance	7,466			7,466		7,500
Specific Allowance for Impaired Loans	0		0	0	0	0
Average Recorded Investment	7,489	7,500	0	7,494	0
Interest Income Recognized	109	89	0	199	0
Real estate loans \| Commercial non-owner occupied
Impaired Loans
Unpaid Principal Balance	3,654			3,654
Total impaired loans	243			243
With Specific Allowance	0			0
Without Specific Allowance	243			243
Specific Allowance for Impaired Loans	0		0	0	0
Average Recorded Investment	162	0	430	81	215
Interest Income Recognized	0	0	0	0	0
Real estate loans \| Multi-family
Impaired Loans
Specific Allowance for Impaired Loans	0		0	0	0
Average Recorded Investment	0	0	589	0	705
Interest Income Recognized	0	0	0	0	0
Real estate loans \| One-to-four family
Impaired Loans
Unpaid Principal Balance	413			413		453
Total impaired loans	380			380		408
With Specific Allowance	0			0		0
Without Specific Allowance	380			380		408
Specific Allowance for Impaired Loans	0		0	0	0	$ 0
Average Recorded Investment	383	395	1,343	389	1,184
Interest Income Recognized	0	0	0	0	0
Real estate loans \| Land
Impaired Loans
Unpaid Principal Balance	480			480
Total impaired loans	480			480
With Specific Allowance	0			0
Without Specific Allowance	480			480
Specific Allowance for Impaired Loans	0		0	0	0
Average Recorded Investment	160	0	6	80	7
Interest Income Recognized	0	0	0	0	0
Consumer Loans \| Consumer loans
Impaired Loans
Specific Allowance for Impaired Loans	0		0	0	0
Average Recorded Investment	17	57	15	37	55
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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