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Other Borrowings and Notes Payable (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Instrument [Line Items] |
Schedule of Line of Credit Facilities [Table Text Block] | Revolving Credit In February 2016, the Company entered into a senior unsecured revolving credit agreement ("Revolving Agreement") with another bank allowing for borrowings up to $20 million. The proceeds can be used for general corporate purposes. The Revolving Agreement is subject to ongoing compliance with a number of customary affirmative and negative covenants as well as specified financial covenants. A summary of the amounts drawn on the Revolving Agreement as of December 31, 2017, and 2016 is as follows:
| December 31,
($ in thousands) | 2017 |  | 2016
Outstanding balance | $ | — |  |  | $ | — |
Average balance during the year | $ | 822 |  |  | $ | — |
Maximum balance outstanding at any month-end | 10,000 |  |  | — |
Weighted average interest rate during the year | 3.50 | % |  | — | %
Average interest rate at December 31 | — | % |  | — | %
Other Borrowings |
Debt Instrument [Line Items] |
Summary of Other Borrowings | A summary of other borrowings is as follows:
| December 31,
($ in thousands) | 2017 |  | 2016
Securities sold under customer repurchase agreements | $ | 253,674 |  |  | $ | 276,980 |
Average balance during the year | $ | 220,807 |  |  | $ | 206,643 |
Maximum balance outstanding at any month-end | 253,674 |  |  | 276,980 |
Average interest rate during the year | 0.21 | % |  | 0.19 | %
Average interest rate at December 31 | 0.25 | % |  | 0.18 | %

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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