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Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Intangible assets at December 31, 2020 and 2019 are summarized as follows (in thousands):
| 2020 |  | 2019
Goodwill | $ | 443,001 |  |  | 420,562 |
Core deposit premiums | 1,112 |  |  | 1,753 |
Customer relationship and other intangibles | 21,466 |  |  | 14,142 |
Mortgage servicing rights | 633 |  |  | 562 |
Total intangible assets | $ | 466,212 |  |  | 437,019 |
Amortization expense of intangible assets for the years ended December 31, 2020, 2019 and 2018 is as follows (in thousands):
| 2020 |  | 2019 |  | 2018
Core deposit premiums | $ | 824 |  |  | 786 |  |  | 931 |
Customer relationship and other intangibles | 2,457 |  |  | 1,869 |  |  | 1,073 |
Mortgage servicing rights | 144 |  |  | 85 |  |  | 123 |
Total amortization expense of intangible assets | $ | 3,425 |  |  | 2,740 |  |  | 2,127 |
Scheduled amortization of core deposit premiums and customer relationship and other intangibles for each of the next five years is as follows (in thousands):
Year ended December 31, |  | Scheduled Amortization
2021 |  | $ | 3,513 |
2022 |  | 3,143 |
2023 |  | 2,771 |
2024 |  | 2,432 |
2025 |  | 2,206 |

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