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Troubled Debt Restructurings (Details Textual) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 USD ($) Loans | Sep. 30, 2016 USD ($) Loan Loans | Sep. 30, 2017 USD ($) Loans | Sep. 30, 2016 USD ($) Loan Loans | Dec. 31, 2016 USD ($)
Financing Receivable Modifications [Line Items] |  |  |  |  |
Total troubled debt restructurings | $ 4,900,000 |  | $ 4,900,000 |  | $ 7,000,000
Specific reserves to customers | 77,000 |  | 77,000 |  | 249,000
Commitments to lend additional amounts to borrowers classified as troubled debt restructurings | 0 |  | 0 |  | 0
Provision for loan losses | $ 950,000 | $ 1,110,000 | $ 2,950,000 | $ 2,880,000 | 0
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans | 0 |  | 0 |  |
Residential Real Estate Loan And Home Equity Line Of Credit |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Loans default payment past due period |  |  | 30 days |  |
Commercial loans |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Troubled debt restructured loans with subsequent payment defaults | Loans | Loan |  | 2 |  | 2 |
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 |  | 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 |  | 1 |
Troubled debt restructurings |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Specific reserves to customers | $ 77,000 |  | $ 77,000 |  | $ 101,000
Allowance adjustment charge offs | 30,000 | $ 25,000 | 60,000 | $ 353,000 |
Provision for loan losses | $ 30,000 | $ 25,000 | $ 60,000 | $ 36,000 |
Contractual Interest Rate Reduction |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Reduction of the notes stated interest rate |  | 1.20% |  | 1.20% |
Contractual Interest Rate Reduction | Minimum |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Reduction of the notes stated interest rate | 0.49% |  | 0.49% |  |
Contractual Interest Rate Reduction | Maximum |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Reduction of the notes stated interest rate | 1.89% |  | 1.89% |  |
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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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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