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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CONCENTRATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mortgage Banking Activities      
Initial amortization period of MSRs 7 years    
Impairment in MSR portfolio $ 0 $ 0  
Loan servicing income $ 2,169 $ 1,983 $ 1,896
Geographic concentration risk | California      
Mortgage Banking Activities      
Concentration Risk, Percentage 72.00%    
Warehouse lines of credit | Geographic concentration risk | California      
Mortgage Banking Activities      
Concentration Risk, Percentage 30.00%    
Net income | Geographic concentration risk | RPG      
Mortgage Banking Activities      
Concentration Risk, Percentage 25.00% 20.00% 13.00%
Net income | Geographic concentration risk | Tax Refund Solutions      
Mortgage Banking Activities      
Concentration Risk, Percentage 13.00% 13.00% 11.00%
Net income | Geographic concentration risk | Republic Credit Solutions      
Mortgage Banking Activities      
Concentration Risk, Percentage 12.00% 7.00% 2.00%
Net income | Geographic concentration risk | Warehouse Lending      
Mortgage Banking Activities      
Concentration Risk, Percentage 7.00% 8.00% 7.00%