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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] | The change in goodwill during the year is as follows (dollars in thousands):
|  | 2016 |  | 2015 |  |
Beginning of year |  | $ | 145,909 |  | $ | 145,909 |  |
Acquired goodwill |  |  | - |  |  | - |  |
Impairment |  |  | - |  |  | - |  |
End of year |  | $ | 145,909 |  | $ | 145,909 |  |
Intangible Assets Disclosure [Text Block] | The table below provides information regarding the carrying amounts and accumulated amortization of total amortized intangible assets as of the dates set forth below.
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |
|  | (dollars in thousands) |
As of December 31, 2016: |  |  |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 6,011 |  | $ | (2,923) |  | $ | 3,088 |  |
As of December 31, 2015: |  |  |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 6,011 |  | $ | (2,103) |  | $ | 3,908 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | Aggregate amortization expense was $820,000, $917,000 and $507,000 for 2016, 2015 and 2014, respectively. Estimated amortization expense for each of the next five years (in thousands):
2017 |  | $ | 724 |
2018 |  |  | 627 |
2019 |  |  | 531 |
2020 |  |  | 434 |
2021 |  |  | 338 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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