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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Carrying Value of Intangible Assets Subject to Amortization |
|  | 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 |
|  | December 31, 2018 |
|  | Purchase |  |  | Accumulated |  |  | Carrying |
(in thousands) |  | Value |  |  | Amortization |  |  | Value |
Core deposit intangibles |  | $ |  | 215,955 |  |  | $ |  | 151,446 |  |  | $ |  | 64,509 |
Credit card and trust relationships |  |  |  | 49,962 |  |  |  |  | 19,564 |  |  |  |  | 30,398 |
Merchant processing relationships |  |  |  | 10,000 |  |  |  |  | 8,756 |  |  |  |  | 1,244 |
|  | $ |  | 275,917 |  |  | $ |  | 179,766 |  |  | $ |  | 96,151 |
Aggregate Amortization Expense |
|  | Years Ended December 31, |
(in thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Core deposit intangibles |  | $ |  | 17,132 |  |  | $ |  | 18,566 |  |  | $ |  | 19,442 |
Credit card and trust relationships |  |  |  | 2,883 |  |  |  |  | 2,682 |  |  |  |  | 1,975 |
Merchant processing relationships |  |  |  | 829 |  |  |  |  | 802 |  |  |  |  | 1,000 |
|  | $ |  | 20,844 |  |  | $ |  | 22,050 |  |  | $ |  | 22,417 |
Estimated Amortization Expense of Other Intangible Assets |
(in thousands) |  |  |  |  |
2020 |  |  | $ | 19,916 |
2021 |  |  |  | 16,665 |
2022 |  |  |  | 14,033 |
2023 |  |  |  | 11,557 |
2024 |  |  |  | 9,413 |
Thereafter |  |  |  | 35,223 |
|  | $ |  | 106,807 |

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