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DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Disclosure (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Assets and liabilities measured at fair value on a recurring basis    
Real estate acquired by foreclosure $ 802 $ 5,220
Level 3    
Assets and liabilities measured at fair value on a recurring basis    
Loans held for investment 3,206,145  
Real estate acquired by foreclosure $ 802 $ 5,220
Real Estate | Level 3    
Assets and liabilities measured at fair value on a recurring basis    
Discount rates 8.00%  
Minimum | Loans Held For Investments [Member] | Level 3    
Assets and liabilities measured at fair value on a recurring basis    
Payment speed 0.00%  
Discount rates 0.00%  
Maximum | Loans Held For Investments [Member] | Level 3    
Assets and liabilities measured at fair value on a recurring basis    
Payment speed 99.59%  
Discount rates 11.35%  
Weighted Average | Loans Held For Investments [Member] | Level 3    
Assets and liabilities measured at fair value on a recurring basis    
Payment speed 28.45%  
Discount rates 4.72%