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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |
Beginning balance | $ 274,769 | $ 274,769 |
Goodwill acquired | 5,772 | 0 |
Ending balance | 280,541 | 274,769 | $ 274,769
Finite-Lived Intangible Assets [Abstract] |  |  |
Gross carrying amount | 36,008 | 43,574 |
Less: accumulated amortization | 24,273 | 31,554 |
Net carrying amount | 11,735 | 12,020 |
Impairment of goodwill | 0 | 0 |
Amortization Expense [Abstract] |  |  |
Amortization of intangible assets | 3,395 | 3,579 | $ 4,042
Future Amortization Expense [Abstract] |  |  |
2021 | 2,800 |  |
2022 | 2,200 |  |
2023 | 1,800 |  |
2024 | 1,500 |  |
2025 | 1,200 |  |
Thereafter | 2,300 |  |
Impairment of intangible assets | $ 0 | 0 |
Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Abstract] |  |  |
Intangible asset useful life | 1 year |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Abstract] |  |  |
Intangible asset useful life | 20 years |  |
Core Deposits Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Abstract] |  |  |
Gross carrying amount | $ 8,951 | 8,951 |
Less: accumulated amortization | 8,463 | 7,988 |
Net carrying amount | 488 | 963 |
Identified Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Abstract] |  |  |
Gross carrying amount | 27,057 | 34,623 |
Less: accumulated amortization | 15,810 | 23,566 |
Net carrying amount | $ 11,247 | $ 11,057 |

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