Loans - Average Recorded Investments in Impaired Loans and Related Amount of Interest Recognized (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Impaired [Line Items]
Loans, Average recorded investment	$ 3,646	$ 1,935	$ 2,899	$ 2,210
Loans, Interest income recognized on impaired loans	10	22	23	41
SBA loans held for investment
Financing Receivable, Impaired [Line Items]
Loans, Average recorded investment	1,076	989	867	993
Loans, Interest income recognized on impaired loans	0	22	(2)	19
SBA 504 loans
Financing Receivable, Impaired [Line Items]
Loans, Average recorded investment			0	165
Loans, Interest income recognized on impaired loans			0	0
Commercial loans \| Other
Financing Receivable, Impaired [Line Items]
Loans, Average recorded investment	19	25	9	25
Loans, Interest income recognized on impaired loans	0	0	0	0
Commercial loans \| Commercial real estate
Financing Receivable, Impaired [Line Items]
Loans, Average recorded investment	2,551	921	2,023	1,027
Loans, Interest income recognized on impaired loans	10	0	25	22
Small Business Administration
Financing Receivable, Impaired [Line Items]
Impaired financing receivable average recorded investment, guaranteed by Small Business Administration	$ 95	$ 54	$ 63	$ 151

Impaired Financing Receivable Average Recorded Investment, Guaranteed by the Small Business Administration

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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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- Definition

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.

+ References

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