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Securities Sold under Agreements to Repurchase (Tables) | 12 Months Ended
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Dec. 31, 2017
Securities Sold under Agreements to Repurchase [Abstract] |
Schedule of information concerning repurchase agreements [Table Text Block] | Repurchase agreements are secured borrowings. The Company pledges investment securities to secure those borrowings. Information concerning repurchase agreements is summarized as follows:
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (dollars in thousands) |
Average daily balance during the year |  | $ | 6,781 |  |  | $ | 15,000 |  |  | $ | 22,890 |
Average interest rate during the year |  |  | 5.95 | % |  |  | 5.95 | % |  |  | 5.92 | %
Maximum month-end balance during the year |  | $ | 15,000 |  |  | $ | 15,000 |  |  | $ | 31,000 |
Weighted average interest rate during the year |  |  | 5.95 | % |  |  | 5.95 | % |  |  | 5.92 | %
Schedule of remaining contractual maturity [Table Text Block] | The table below shows the remaining contractual maturity of repurchase agreements by fair value of collateral pledged:
|  | December 31, 2017 |
|  | Remaining Contractual Maturity of the Agreements |
|  | Overnight and Continuous |  | Up to 30 Days |  |  | 30-90 Days |  | Greater Than 90 Days |  | Total |
Repurchase agreements and repurchase-to-maturity transactions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agency securities |  | $ | - |  | $ | - |  |  | $ | - |  | $ | - |  | $ | - |
Residential mortgage pass-through securities |  |  | - |  |  | - |  |  |  | - |  |  | - |  |  | - |
Total Borrowings |  | $ | - |  | $ | - |  |  | $ | - |  | $ | - |  | $ | - |
Amounts related to repurchase agreements not included in offsetting disclosure in Note 13. |  |  | $ | - |
|  | December 31, 2016 |
|  | Remaining Contractual Maturity of the Agreements
|  | (dollars in thousands)
|  | Overnight and Continuous |  | Up to 30 Days |  |  | 30-90 Days |  | Greater Than 90 Days |  | Total |
Repurchase agreements and repurchase-to-maturity transactions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agency securities |  | $ | - |  | $ | - |  |  | $ | - |  | $ | - |  | $ | - |
Residential mortgage pass-through securities |  |  | - |  |  | - |  |  |  | - |  |  | 16,826 |  |  | 16,826 |
Total Borrowings |  | $ | - |  | $ | - |  |  | $ | - |  | $ | 16,826 |  | $ | 16,826 |
Amounts related to agreements not included in offsetting disclosure in Note 13. |  |  | $ | 1,826 |

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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- Definition The entire disclosure for repurchase agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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