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Troubled Debt Restructurings (Details Textual)	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) Loans	Mar. 31, 2016 USD ($) Loans	Dec. 31, 2016 USD ($)
Financing Receivable Modifications [Line Items]
Total troubled debt restructurings	$ 6,200,000		$ 7,000,000
Specific reserves to customers	95,000		96,000
Commitments to lend additional amounts to borrowers classified as troubled debt restructurings	0		0
Provision for loan losses	$ 1,050,000	$ 780,000	0
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans	0
Residential Real Estate Loan And Home Equity Line Of Credit
Financing Receivable Modifications [Line Items]
Loans default payment past due period	30 days
Residential real estate loan
Financing Receivable Modifications [Line Items]
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans		1
Residential real estate, Home equity lines of credit
Financing Receivable Modifications [Line Items]
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans		1
Troubled debt restructurings
Financing Receivable Modifications [Line Items]
Specific reserves to customers	$ 101,000		$ 101,000
Allowance adjustment charge offs	13,000	$ 11,000
Provision for loan losses	$ 13,000	$ 11,000
Contractual Interest Rate Reduction
Financing Receivable Modifications [Line Items]
Reduction of the notes stated interest rate	1.89%	1.24%
Extended Maturity
Financing Receivable Modifications [Line Items]
Maturity period loans		120 months
Extended Maturity | Minimum
Financing Receivable Modifications [Line Items]
Maturity period loans	6 months
Extended Maturity | Maximum
Financing Receivable Modifications [Line Items]
Maturity period loans	132 months

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Provision (reversal) for loan losses expensed.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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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 11B
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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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-Name Accounting Standards Codification
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-SubTopic 40
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Reflects the amount of the write-down related to a troubled debt restructuring.

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Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

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