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Goodwill and Other Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Core Deposit Intangibles |  |
Estimated future amortization expense |  |
Six Months Ending December 31, 2018 | $ 2,905 |
Year ending December 31, 2019 | 5,810 |
Year ending December 31, 2020 | 5,810 |
Year ending December 31, 2021 | 5,810 |
Year ending December 31, 2022 | 5,810 |
Year ending December 31, 2023 | 5,810 |
Beyond 2023 | 23,724 |
Net Book Value | 55,679 | $ 0
Other Intangible Assets |  |
Estimated future amortization expense |  |
Six Months Ending December 31, 2018 | 1,563 |
Year ending December 31, 2019 | 2,828 |
Year ending December 31, 2020 | 2,711 |
Year ending December 31, 2021 | 2,687 |
Year ending December 31, 2022 | 2,663 |
Year ending December 31, 2023 | 2,644 |
Beyond 2023 | 9,571 |
Net Book Value | 24,668 | $ 15,580
Mortgage Servicing Rights |  |
Estimated future amortization expense |  |
Six Months Ending December 31, 2018 | 4,725 |
Year ending December 31, 2019 | 9,150 |
Year ending December 31, 2020 | 7,963 |
Year ending December 31, 2021 | 6,906 |
Year ending December 31, 2022 | 6,000 |
Year ending December 31, 2023 | 5,228 |
Beyond 2023 | 27,185 |
Net Book Value | $ 67,157 |

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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