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Goodwill and Other Intangible Assets - Summary of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | $ 84,962 | $ 84,962
Accumulated Amortization | (53,164) | (47,702)
Net Carrying Amount | 31,798 | 37,260
Core deposit intangibles |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 82,492 | 82,492
Accumulated Amortization | (51,925) | (46,599)
Net Carrying Amount | 30,567 | 35,893
Customer relationship intangible |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 2,470 | 2,470
Accumulated Amortization | (1,239) | (1,103)
Net Carrying Amount | $ 1,231 | $ 1,367

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