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Other Intangibles- Schedule of Core Deposit Intangibles (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Goodwill and Intangible Assets Disclosure [Abstract] |  |
Gross carrying amount | $ 102,396 | $ 102,396
Other intangibles acquired | 2,247 | 0
Accumulated amortization | (77,705) | (73,421)
Total core deposit and other intangibles | $ 26,938 | $ 28,975

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