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Other Assets Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 26, 2008
Variable Interest Entity [Line Items]        
Income (Loss) from Equity Method Investments $ 481 $ 774 $ (437)  
Investment in limited partnerships 3,215 3,193    
Investment in Community Development Entities 7,500 7,500    
Sole ownership of common securities issued by Trust II 315      
Trust preferred securities $ 10,000 10,000    
Investment in CDE Tax Credit, Description, Terms on New Market Tax Credit The investment provides federal new market tax credits over a seven-year credit allowance period. In each of the first three years, credits totaling five percent of the original investment are allowed on the credit allowance dates and for the final four years, credits totaling six percent of the original investment are allowed on the credit allowance dates. Rimrock must be invested in the qualified CDE on each of the credit allowance dates during the seven-year period to utilize the tax credits. If the CDE ceases to qualify during the seven-year period, the credits may be denied for any credit allowance date and a portion of the credits previously taken may be subject to recapture with interest. The investment in the CDE cannot be redeemed before the end of the seven-year period.      
Investment in Trust II $ 315 315    
Trust II        
Variable Interest Entity [Line Items]        
Trust preferred securities       $ 10,000
Fixed rate       10.50%
Aldine Capital Fund, LP        
Variable Interest Entity [Line Items]        
Investment in limited partnerships 1,000 1,100    
Remaining commitment to provide funds to Limited Partnerships 960      
Aldine Capital Fund II, LP        
Variable Interest Entity [Line Items]        
Investment in limited partnerships 2,173 $ 2,051    
Remaining commitment to provide funds to Limited Partnerships $ 2,800