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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill and Intangible Assets | The following table sets forth activity for goodwill and other intangible assets for the periods indicated:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (in thousands)
Goodwill |  |  |  |  |  |  |  |
Total goodwill |  | $ | 382,762 |  |  | $ | 382,762 |  |  | $ | 382,762 |  |  | $ | 382,762 |
Other intangible assets, net |  |  |  |  |  |  |  |
Core deposit intangible: |  |  |  |  |  |  |  |
Gross core deposit intangible balance at beginning of period |  | 58,598 |  |  | 58,598 |  |  | 58,598 |  |  | 58,598 |
Accumulated amortization at beginning of period |  | (44,484 | ) |  | (39,006 | ) |  | (41,886 | ) |  | (35,940 | )
Core deposit intangible, net at beginning of period |  | 14,114 |  |  | 19,592 |  |  | 16,712 |  |  | 22,658 |
CDI current period amortization |  | (1,188 | ) |  | (1,460 | ) |  | (3,786 | ) |  | (4,526 | )
Total core deposit intangible, net at end of period |  | 12,926 |  |  | 18,132 |  |  | 12,926 |  |  | 18,132 |
Intangible assets not subject to amortization |  | 919 |  |  | 919 |  |  | 919 |  |  | 919 |
Other intangible assets, net at end of period |  | 13,845 |  |  | 19,051 |  |  | 13,845 |  |  | 19,051 |
Total goodwill and other intangible assets at end of period |  | $ | 396,607 |  |  | $ | 401,813 |  |  | $ | 396,607 |  |  | $ | 401,813 |
Estimated Future Amortization Expense of Core Deposit Intangibles | The following table provides the estimated future amortization expense of core deposit intangibles for the remaining three months ending December 31, 2017 and the succeeding four years:
|  | Amount
|  | (in thousands)
Year ending December 31, |  |
2017 |  | $ | 1,127 |
2018 |  | 3,855 |
2019 |  | 2,951 |
2020 |  | 2,048 |
2021 |  | 1,440 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + 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 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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