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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2015
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,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
|  | (in thousands)
Goodwill |  |  |  |  |  |  |  |
Goodwill at beginning of period (1) |  | $ | 382,537 |  |  | $ | 343,952 |  |  | $ | 382,537 |  |  | $ | 343,952 |
Provisional period adjustments (1) |  | 225 |  |  | — |  |  | 225 |  |  | — |
Total goodwill (1) |  | 382,762 |  |  | 343,952 |  |  | 382,762 |  |  | 343,952 |
Other intangible assets, net |  |  |  |  |  |  |  |
Core deposit intangible: |  |  |  |  |  |  |  |
Gross core deposit intangible balance at beginning of period (1) |  | 58,598 |  |  | 47,698 |  |  | 58,598 |  |  | 47,698 |
Accumulated amortization at beginning of period |  | (32,593 | ) |  | (25,825 | ) |  | (29,058 | ) |  | (22,765 | )
Core deposit intangible, net at beginning of period |  | 26,005 |  |  | 21,873 |  |  | 29,540 |  |  | 24,933 |
CDI current period amortization |  | (1,695 | ) |  | (1,456 | ) |  | (5,230 | ) |  | (4,516 | )
Total core deposit intangible, net at end of period |  | 24,310 |  |  | 20,417 |  |  | 24,310 |  |  | 20,417 |
Intangible assets not subject to amortization |  | 919 |  |  | 919 |  |  | 919 |  |  | 919 |
Other intangible assets, net at end of period |  | 25,229 |  |  | 21,336 |  |  | 25,229 |  |  | 21,336 |
Total goodwill and other intangible assets at end of period |  | $ | 407,991 |  |  | $ | 365,288 |  |  | $ | 407,991 |  |  | $ | 365,288 |
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, 2015 and the succeeding four years:
|  | Amount
|  | (in thousands)
Year ending December 31, |  |
2015 |  | $ | 1,653 |
2016 |  | 5,945 |
2017 |  | 4,913 |
2018 |  | 3,855 |
2019 |  | 2,951 |

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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=26713463&loc=d3e16323-109275 + Details
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