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Goodwill and Other Intangibles (Tables) | 9 Months Ended
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Sep. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | Changes in the carrying amount of goodwill for the periods ended September 30, 2021 and December 31, 2020 by reportable segment are as follows (in thousands):
|  | Commercial Banking |  |  | Institutional Banking |  |  | Personal Banking |  |  | Total |
Balances as of January 1, 2021 |  | $ | 59,419 |  |  | $ | 51,332 |  |  | $ | 70,116 |  |  | $ | 180,867 |
Sale of component of business segment |  |  | — |  |  |  | — |  |  |  | (6,349 | ) |  |  | (6,349 | )
Balances as of September 30, 2021 |  | $ | 59,419 |  |  | $ | 51,332 |  |  | $ | 63,767 |  |  | $ | 174,518 |
Balances as of January 1, 2020 |  | $ | 59,419 |  |  | $ | 51,332 |  |  | $ | 70,116 |  |  | $ | 180,867 |
Balances as of December 31, 2020 |  | $ | 59,419 |  |  | $ | 51,332 |  |  | $ | 70,116 |  |  | $ | 180,867 |
Changes in Intangible Assets | The following table lists the finite-lived intangible assets that continue to be subject to amortization as of September 30, 2021 and December 31, 2020 (in thousands):
|  | As of September 30, 2021 |
|  | Core Deposit Intangible Assets |  |  | Customer Relationships |  |  | Total |
Gross carrying amount |  | $ | 50,059 |  |  | $ | 71,167 |  |  | $ | 121,226 |
Accumulated amortization |  |  | 49,445 |  |  |  | 56,255 |  |  |  | 105,700 |
Net carrying amount |  | $ | 614 |  |  | $ | 14,912 |  |  | $ | 15,526 |
|  | As of December 31, 2020 |
|  | Core Deposit Intangible Assets |  |  | Customer Relationships |  |  | Total |
Gross carrying amount |  | $ | 50,059 |  |  | $ | 89,928 |  |  | $ | 139,987 |
Accumulated amortization |  |  | 48,746 |  |  |  | 70,185 |  |  |  | 118,931 |
Net carrying amount |  | $ | 1,313 |  |  | $ | 19,743 |  |  | $ | 21,056 |
Aggregate Amortization Expense Recognized | The following table has the aggregate amortization expense recognized in each period (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Aggregate amortization expense |  | $ | 1,110 |  |  | $ | 1,524 |  |  | $ | 3,647 |  |  | $ | 4,916 |
Estimated Amortization Expense of Intangible Assets | The following table lists estimated amortization expense of intangible assets in future periods (in thousands):
For the three months ending December 31, 2021 |  | $ | 1,110 |
For the year ending December 31, 2022 |  |  | 3,920 |
For the year ending December 31, 2023 |  |  | 3,323 |
For the year ending December 31, 2024 |  |  | 2,704 |
For the year ending December 31, 2025 |  |  | 2,608 |

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