Loans - Impaired Loans with Associated Allowance Amount (Details) $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($) loan	Dec. 31, 2017 USD ($)
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance	$ 2,373	$ 203
Unpaid principal balance, with related allowance	1,864	1,534
Unpaid principal balance, total	4,237	1,737
Recorded investment, with no related allowance	2,346	120
Recorded investment, with related allowance	1,775	1,339
Recorded investment	4,120	1,459
Impaired financing receivable, related allowance	586	332
Loans receivable, nonaccrual status	5,209	2,994
Increase in impaired loans	2,500
SBA loans held for investment
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance	331	135
Unpaid principal balance, with related allowance	1,078	748
Unpaid principal balance, total	1,409	883
Recorded investment, with no related allowance	304	52
Recorded investment, with related allowance	989	553
Recorded investment	1,292	605
Impaired financing receivable, related allowance	448	194
Loans receivable, nonaccrual status	1,420	632
SBA 504 loans
Financing Receivable, Impaired [Line Items]
Loans receivable, nonaccrual status	0	0
Commercial loans
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance	2,042	68
Unpaid principal balance, with related allowance	786	786
Unpaid principal balance, total	2,828	854
Recorded investment, with no related allowance	2,042	68
Recorded investment, with related allowance	786	786
Recorded investment	2,828	854
Impaired financing receivable, related allowance	138	138
Loans receivable, nonaccrual status	$ 2,000
Number of loans \| loan	3
Commercial loans \| Other
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance		25
Unpaid principal balance, with related allowance	$ 19
Unpaid principal balance, total	19	25
Recorded investment, with no related allowance		25
Recorded investment, with related allowance	19
Recorded investment	19	25
Impaired financing receivable, related allowance	19	0
Loans receivable, nonaccrual status	19	25
Commercial loans \| Commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid principal balance, with no related allowance	2,042	43
Unpaid principal balance, with related allowance	767	786
Unpaid principal balance, total	2,809	829
Recorded investment, with no related allowance	2,042	43
Recorded investment, with related allowance	767	786
Recorded investment	2,809	829
Impaired financing receivable, related allowance	119	138
Loans receivable, nonaccrual status	2,043	43
Commercial loans \| Commercial real estate construction
Financing Receivable, Impaired [Line Items]
Loans receivable, nonaccrual status	0	$ 0
Small Business Administration
Financing Receivable, Impaired [Line Items]
Loans receivable, nonaccrual status	$ 579
Number of loans \| loan	2

Financing Receivable, Recorded Investment, Increase (Decrease) In Impaired Loans

No definition available.

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- Definition

Financing Receivable, Recorded Investment, Number Of Loans

+ References

No definition available.

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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

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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- Definition

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 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ 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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

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- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no 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 (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

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- Definition

Unpaid principal balance of impaired financing receivables for which there is 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 (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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