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Loans (Details Textual)	12 Months Ended
	Dec. 31, 2016 USD ($) Loans	Dec. 31, 2015 USD ($) Loans	Dec. 31, 2014 USD ($) Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Total troubled debt restructurings	$ 7,000,000	$ 9,300,000
Specific reserves to customers	96,000	497,000
Commitments to lend additional amounts to borrowers classified as troubled debt restructurings	0	0
Allowance adjustment charge offs	344,000	129,000	$ 42,000
Increase in the allowance for loan losses as a result of the allowance	43,000	101,000	$ 11,000
Maximum commercial loan and commercial real estate relationships	750,000
Commercial real estate loan
Financing Receivable Recorded Investment Past Due [Line Items]
Total troubled debt restructurings	$ 1,200,000	$ 40,000
Troubled debt restructured loans with subsequent payment defaults | Loans	2	1
Residential real estate loan
Financing Receivable Recorded Investment Past Due [Line Items]
Total troubled debt restructurings	$ 1,000	$ 1,000
Troubled debt restructured loans with subsequent payment defaults | Loans	1	1	4
Residential real estate, Home equity lines of credit
Financing Receivable Recorded Investment Past Due [Line Items]
Total troubled debt restructurings	$ 10,000	$ 11,000
Troubled debt restructured loans with subsequent payment defaults | Loans	1	1
Troubled debt restructurings
Financing Receivable Recorded Investment Past Due [Line Items]
Specific reserves to customers	$ 101,000	$ 528,000
Contractual Interest Rate Reduction | Minimum
Financing Receivable Recorded Investment Past Due [Line Items]
Reduction of the notes stated interest rate	0.38%
Contractual Interest Rate Reduction | Maximum
Financing Receivable Recorded Investment Past Due [Line Items]
Reduction of the notes stated interest rate	11.51%
Extended Maturity | Minimum
Financing Receivable Recorded Investment Past Due [Line Items]
Maturity period loans	9 months
Extended Maturity | Maximum
Financing Receivable Recorded Investment Past Due [Line Items]
Maturity period loans	122 months

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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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