Loans (Average Recorded Investments in Impaired Loans and Related Amount of Interest Recognized) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Average recorded investment	$ 1,460	$ 4,410
Interest income recognized on impaired loans	90	111
Impaired financing receivable average recorded investment, guaranteed by Small Business Administration	318	200
SBA loans held for investment
Financing Receivable, Impaired [Line Items]
Average recorded investment	668	1,535
Interest income recognized on impaired loans	47	14
SBA 504 loans
Financing Receivable, Impaired [Line Items]
Average recorded investment	82	798
Interest income recognized on impaired loans	0	0
Commercial loans \| Other
Financing Receivable, Impaired [Line Items]
Average recorded investment	25	607
Interest income recognized on impaired loans	0	38
Commercial loans \| Commercial real estate
Financing Receivable, Impaired [Line Items]
Average recorded investment	685	1,198
Interest income recognized on impaired loans	43	59
Commercial loans \| Commercial real estate construction
Financing Receivable, Impaired [Line Items]
Average recorded investment	0	272
Interest income recognized on impaired loans	$ 0	$ 0

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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