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Document And Entity Information
 6 Months Ended
Jun. 30, 2013
Jul. 31, 2013
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2013  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q2  
Trading Symbol BSRR  
Entity Common Stock, Shares Outstanding   14,170,119
Entity Registrant Name SIERRA BANCORP  
Entity Central Index Key 0001130144  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer