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Intangible Assets | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Intangible assets at December 31, 2017 and 2016 are summarized as follows (in thousands):
| 2017 |  | 2016
Goodwill | $ | 411,600 |  |  | 411,600 |
Core deposit premiums | 3,470 |  |  | 4,546 |
Customer relationship and other intangibles | 4,483 |  |  | 5,957 |
Mortgage servicing rights | 737 |  |  | 834 |
Total intangible assets | $ | 420,290 |  |  | 422,937 |
Amortization expense of intangible assets for the years ended December 31, 2017, 2016 and 2015 is as follows (in thousands):
| 2017 |  | 2016 |  | 2015
Core deposit premiums | $ | 1,076 |  |  | 1,300 |  |  | 1,757 |
Customer relationship and other intangibles | 1,474 |  |  | 1,909 |  |  | 2,136 |
Mortgage servicing rights | 120 |  |  | 182 |  |  | 173 |
Total amortization expense of intangible assets | $ | 2,670 |  |  | 3,391 |  |  | 4,066 |
Scheduled amortization of core deposit and customer relationship intangibles for each of the next five years is as follows (in thousands):
Year ended December 31, |  | Scheduled Amortization
2018 |  | $ | 2,004 |
2019 |  | 1,709 |
2020 |  | 1,415 |
2021 |  | 1,120 |
2022 |  | 825 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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