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Core Deposit Intangibles - Schedule of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 102,396 | $ 85,869
Accumulated amortization | (70,459) | (67,434)
Total core deposit intangibles | 31,937 | 34,962
Core deposit intangibles acquired |  |
Finite-Lived Intangible Assets [Line Items] |  |
Core deposit intangibles acquired | $ 0 | $ 16,527

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