Loans - Investment in impaired loans (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impaired Loans
Investment in TDR	$ 97,000	$ 0
Nonaccruing loans	3,300,000	1,100,000	$ 4,000,000
Additional loan interest income, had such loans been performing	155,000	360,000	279,000
Loans 90 days or more past due and still accruing	$ 1,800,000	0
Second Relationship [Member] \| Extended Maturity [Member]
Impaired Loans
Extension of maturity	3 years
Business Loans \| Commercial and industrial
Impaired Loans
Recorded Investment	$ 1,160,000	250,000	313,000
Unpaid Principal Balance	1,585,000	1,990,000	578,000
With Specific Allowance	0	250,000	0
Without Specific Allowance	1,160,000	0	313,000
Specific Allowance for Impaired Loans	0	250,000	0
Average Recorded Investment	441,000	864,000	90,000
Interest Income Recognized	0	76,000	29,000
Business Loans \| Franchise
Impaired Loans
Recorded Investment		0	1,630,000
Unpaid Principal Balance		0	2,394,000
With Specific Allowance		0	1,461,000
Without Specific Allowance		0	169,000
Specific Allowance for Impaired Loans		0	731,000
Average Recorded Investment		1,016,000	1,386,000
Interest Income Recognized		68,000	3,000
Business Loans \| Commercial owner occupied
Impaired Loans
Recorded Investment	97,000	436,000	536,000
Unpaid Principal Balance	98,000	847,000	883,000
With Specific Allowance	97,000	0	0
Without Specific Allowance	0	436,000	536,000
Specific Allowance for Impaired Loans	55,000	0	0
Average Recorded Investment	153,000	505,000	415,000
Interest Income Recognized	0	37,000	67,000
Business Loans \| SBA
Impaired Loans
Recorded Investment	1,201,000	316,000
Unpaid Principal Balance	4,329,000	3,865,000
With Specific Allowance	0	0
Without Specific Allowance	1,201,000	316,000
Specific Allowance for Impaired Loans	0	0
Average Recorded Investment	434,000	331,000
Interest Income Recognized	0	23,000
Real Estate Loans
Impaired Loans
Recorded Investment	3,284,000	1,141,000	2,784,000
Unpaid Principal Balance	6,896,000	7,029,000	4,319,000
With Specific Allowance	97,000	250,000	1,461,000
Without Specific Allowance	3,187,000	891,000	1,323,000
Specific Allowance for Impaired Loans	55,000	250,000	731,000
Average Recorded Investment	2,309,000	4,032,000	2,538,000
Interest Income Recognized	0	317,000	123,000
Real Estate Loans \| Commercial non-owner occupied
Impaired Loans
Recorded Investment	0	0	214,000
Unpaid Principal Balance	0	0	329,000
With Specific Allowance	0	0	0
Without Specific Allowance	0	0	214,000
Specific Allowance for Impaired Loans	0	0	0
Average Recorded Investment	86,000	1,072,000	430,000
Interest Income Recognized	0	93,000	19,000
Real Estate Loans \| One-to-four family
Impaired Loans
Recorded Investment	817,000	124,000	70,000
Unpaid Principal Balance	849,000	291,000	98,000
With Specific Allowance	0	0	0
Without Specific Allowance	817,000	124,000	70,000
Specific Allowance for Impaired Loans	0	0	0
Average Recorded Investment	166,000	226,000	204,000
Interest Income Recognized	0	18,000	5,000
Real Estate Loans \| Construction
Impaired Loans
Recorded Investment	0
Unpaid Principal Balance	0
With Specific Allowance	0
Without Specific Allowance	0
Specific Allowance for Impaired Loans	0
Average Recorded Investment	1,017,000
Interest Income Recognized	0
Real Estate Loans \| Land
Impaired Loans
Recorded Investment	9,000	15,000	21,000
Unpaid Principal Balance	35,000	36,000	37,000
With Specific Allowance	0	0	0
Without Specific Allowance	9,000	15,000	21,000
Specific Allowance for Impaired Loans	0	0	0
Average Recorded Investment	12,000	18,000	13,000
Interest Income Recognized	$ 0	$ 2,000	$ 0

Financing Receivable, Modifications, Extension, Maturity

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Amount of unpaid principal balance of impaired financing receivables that are on nonaccrual status as of the balance sheet date with related allowance for credit losses and without related allowance for credit losses.

+ References

No definition available.

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No definition available.

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
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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)
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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.

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
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Amount of allowance for credit losses related to recorded investment.

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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

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

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

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Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 40
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