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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Carrying Value of Intangible Assets Subject to Amortization |
|  | December 31, 2020 |
|  | Purchase |  |  | Accumulated |  |  | Carrying |
(in thousands) |  | Value |  |  | Amortization |  |  | Value |
Core deposit intangibles |  | $ |  | 235,845 |  |  | $ |  | 173,830 |  |  | $ |  | 62,015 |
Credit card and trust relationships |  |  |  | 49,962 |  |  |  |  | 25,085 |  |  |  |  | 24,877 |
Merchant processing relationships |  |  |  | 10,000 |  |  |  |  | 10,000 |  |  |  |  | — |
|  | $ |  | 295,807 |  |  | $ |  | 208,915 |  |  | $ |  | 86,892 |
|  | December 31, 2019 |
|  | Purchase |  |  | Accumulated |  |  | Carrying |
(in thousands) |  | Value |  |  | Amortization |  |  | Value |
Core deposit intangibles |  | $ |  | 247,455 |  |  | $ |  | 168,577 |  |  | $ |  | 78,878 |
Credit card and trust relationships |  |  |  | 49,962 |  |  |  |  | 22,448 |  |  |  |  | 27,514 |
Merchant processing relationships |  |  |  | 10,000 |  |  |  |  | 9,585 |  |  |  |  | 415 |
|  | $ |  | 307,417 |  |  | $ |  | 200,610 |  |  | $ |  | 106,807 |
Aggregate Amortization Expense |
|  | Years Ended December 31, |
(in thousands) |  | 2020 |  |  | 2019 |  |  | 2018 |
Core deposit intangibles |  | $ |  | 16,864 |  |  | $ |  | 17,132 |  |  | $ |  | 18,566 |
Credit card and trust relationships |  |  |  | 2,637 |  |  |  |  | 2,883 |  |  |  |  | 2,682 |
Merchant processing relationships |  |  |  | 415 |  |  |  |  | 829 |  |  |  |  | 802 |
|  | $ |  | 19,916 |  |  | $ |  | 20,844 |  |  | $ |  | 22,050 |
Estimated Amortization Expense of Other Intangible Assets |
(in thousands) |  |  |  |  |
2021 |  | $ |  | 16,665 |
2022 |  |  |  | 14,033 |
2023 |  |  |  | 11,557 |
2024 |  |  |  | 9,413 |
2024 |  |  |  | 7,985 |
Thereafter |  |  |  | 27,239 |
|  | $ |  | 86,892 |

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