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The Business of Sierra Bancorp - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Jan. 31, 1978
The Business of Sierra Bancorp      
Capital     $ 1,500
Assets $ 3,553,072 $ 3,729,799  
Cash, FDIC Insured Amount $ 2,800,000