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The Business of Sierra Bancorp - Additional Information (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Jan. 31, 1978
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Capital |  |  | $ 1,500
Assets | $ 2,670,469 | $ 2,593,819 |
Cash, FDIC Insured Amount | $ 2,200,000 |  |

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