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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Impaired [Line Items]
Loans, Average recorded investment	$ 1,935	$ 4,694	$ 2,210	$ 5,350
Loans, Interest income recognized on impaired loans	22	34	41	72
SBA loans held for investment
Financing Receivable, Impaired [Line Items]
Loans, Average recorded investment	989	1,640	993	1,822
Loans, Interest income recognized on impaired loans	22	1	19	3
SBA 504 loans
Financing Receivable, Impaired [Line Items]
Loans, Average recorded investment	0	513	165	1,082
Loans, Interest income recognized on impaired loans	0	0	0	0
Commercial loans \| Other
Financing Receivable, Impaired [Line Items]
Loans, Average recorded investment	25	929	25	496
Loans, Interest income recognized on impaired loans	0	14	0	38
Commercial loans \| Commercial real estate
Financing Receivable, Impaired [Line Items]
Loans, Average recorded investment	921	1,273	1,027	1,662
Loans, Interest income recognized on impaired loans	0	19	22	31
Commercial loans \| Commercial real estate construction
Financing Receivable, Impaired [Line Items]
Loans, Average recorded investment	0	339	0	288
Loans, Interest income recognized on impaired loans	0	0	0	0
Small Business Administration
Financing Receivable, Impaired [Line Items]
Impaired financing receivable average recorded investment, guaranteed by Small Business Administration	$ 54	$ 218	$ 151	$ 241

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=66008989&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=66008989&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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