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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2018
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 March 31,
|  | 2018 |  | 2017
|  | (in thousands)
Goodwill |  |  |  |
Total goodwill (1) |  | $ | 765,842 |  |  | $ | 382,762 |
Other intangible assets, net |  |  |  |
Core deposit intangible: |  |  |  |
Gross core deposit intangible balance at beginning of period |  | 105,473 |  |  | 58,598 |
Accumulated amortization at beginning of period |  | (48,219 | ) |  | (41,886 | )
Core deposit intangible, net at beginning of period |  | 57,254 |  |  | 16,712 |
CDI current period amortization |  | (3,188 | ) |  | (1,349 | )
Total core deposit intangible, net at end of period |  | 54,066 |  |  | 15,363 |
Intangible assets not subject to amortization |  | 919 |  |  | 919 |
Other intangible assets, net at end of period |  | 54,985 |  |  | 16,282 |
Total goodwill and other intangible assets at end of period |  | $ | 820,827 |  |  | $ | 399,044 |
Estimated Future Amortization Expense of Core Deposit Intangibles | The following table provides the estimated future amortization expense of core deposit intangibles for the remaining nine months ending December 31, 2018 and the succeeding four years:
|  | Amount
|  | (in thousands)
Year ending December 31, |  |
2018 |  | $ | 9,048 |
2019 |  | 10,479 |
2020 |  | 8,724 |
2021 |  | 7,264 |
2022 |  | 5,880 |

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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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