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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangibles | The Company’s goodwill and other intangibles (carrying basis and accumulated amortization) at September 30, 2019 and December 31, 2018, were as follows:
(In thousands) | September 30, 2019 |  | December 31, 2018
Goodwill | $ | 926,648 |  |  | $ | 845,687 |
Core deposit premiums: |  |  |
Gross carrying amount | 124,334 |  |  | 105,984 |
Accumulated amortization | (33,918 | ) |  | (26,177 | )
Core deposit premiums, net | 90,416 |  |  | 79,807 |
Books of business intangible: |  |  |
Gross carrying amount | 15,234 |  |  | 15,234 |
Accumulated amortization | (4,501 | ) |  | (3,707 | )
Books of business intangible, net | 10,733 |  |  | 11,527 |
Other intangible assets, net | 101,149 |  |  | 91,334 |
Total goodwill and other intangible assets | $ | 1,027,797 |  |  | $ | 937,021 |
Estimated Remaining Amortization Expense | The Company’s estimated remaining amortization expense on intangibles as of September 30, 2019 is as follows:
(In thousands) | Year |  | Amortization Expense
| Remainder of 2019 |  | $ | 2,947 |
| 2020 |  | 11,776 |
| 2021 |  | 11,714 |
| 2022 |  | 11,662 |
| 2023 |  | 11,379 |
| Thereafter |  | 51,671 |
| Total |  | $ | 101,149 |

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